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<span>Afficher / masquer la sous-section Procédé</span> </button> <ul id="toc-Procédé-sublist" class="vector-toc-list"> <li id="toc-Principe" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Principe"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>Principe</span> </div> </a> <ul id="toc-Principe-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Application" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Application"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>Application</span> </div> </a> <ul id="toc-Application-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Exemple" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Exemple"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3</span> <span>Exemple</span> </div> </a> <ul id="toc-Exemple-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Limites_et_améliorations" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Limites_et_améliorations"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.4</span> <span>Limites et améliorations</span> </div> </a> <ul id="toc-Limites_et_améliorations-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Transformations_entre_CMJN_et_RVB" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Transformations_entre_CMJN_et_RVB"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Transformations entre CMJN et RVB</span> </div> </a> <button aria-controls="toc-Transformations_entre_CMJN_et_RVB-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Afficher / masquer la sous-section Transformations entre CMJN et RVB</span> </button> <ul id="toc-Transformations_entre_CMJN_et_RVB-sublist" class="vector-toc-list"> <li id="toc-Généralités" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Généralités"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Généralités</span> </div> </a> <ul id="toc-Généralités-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Principes" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Principes"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Principes</span> </div> </a> <ul id="toc-Principes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Conversion_de_RVB_vers_CMJN" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Conversion_de_RVB_vers_CMJN"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>Conversion de RVB vers CMJN</span> </div> </a> <ul id="toc-Conversion_de_RVB_vers_CMJN-sublist" class="vector-toc-list"> <li id="toc-Calcul_des_coordonnées_C,_M,_J_de_l'espace_CMJ" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Calcul_des_coordonnées_C,_M,_J_de_l'espace_CMJ"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.1</span> <span>Calcul des coordonnées <i>C</i>, <i>M</i>, <i>J</i> de l'espace CMJ</span> </div> </a> <ul id="toc-Calcul_des_coordonnées_C,_M,_J_de_l'espace_CMJ-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Calcul_des_coordonnées_c,_m,_j,_n_de_l'espace_CMJN" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Calcul_des_coordonnées_c,_m,_j,_n_de_l'espace_CMJN"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.2</span> <span>Calcul des coordonnées <i>c</i>, <i>m</i>, <i>j</i>, <i>n</i> de l'espace CMJN</span> </div> </a> <ul id="toc-Calcul_des_coordonnées_c,_m,_j,_n_de_l'espace_CMJN-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Conversion_de_CMJN_vers_RVB" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Conversion_de_CMJN_vers_RVB"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.4</span> <span>Conversion de CMJN vers RVB</span> </div> </a> <ul id="toc-Conversion_de_CMJN_vers_RVB-sublist" class="vector-toc-list"> <li id="toc-Calcul_des_composantes_C,_M,_J_de_l'espace_CMJ" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Calcul_des_composantes_C,_M,_J_de_l'espace_CMJ"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.4.1</span> <span>Calcul des composantes <i>C</i>, <i>M</i>, <i>J</i> de l'espace CMJ</span> </div> </a> <ul id="toc-Calcul_des_composantes_C,_M,_J_de_l'espace_CMJ-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Calcul_des_composantes_r,_v,_b_de_l'espace_RVB" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Calcul_des_composantes_r,_v,_b_de_l'espace_RVB"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.4.2</span> <span>Calcul des composantes <i>r</i>, <i>v</i>, <i>b</i> de l'espace RVB</span> </div> </a> <ul id="toc-Calcul_des_composantes_r,_v,_b_de_l'espace_RVB-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </li> <li id="toc-Annexes" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Annexes"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Annexes</span> </div> </a> <button aria-controls="toc-Annexes-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Afficher / masquer la sous-section Annexes</span> </button> <ul id="toc-Annexes-sublist" class="vector-toc-list"> <li id="toc-Étymologie" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Étymologie"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Étymologie</span> </div> </a> <ul id="toc-Étymologie-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Bibliographie" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Bibliographie"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Bibliographie</span> </div> </a> <ul id="toc-Bibliographie-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Liens_externes" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Liens_externes"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.3</span> <span>Liens externes</span> </div> </a> <ul id="toc-Liens_externes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Articles_connexes" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Articles_connexes"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.4</span> <span>Articles connexes</span> </div> </a> <ul id="toc-Articles_connexes-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Notes_et_références" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Notes_et_références"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Notes et références</span> </div> </a> <ul id="toc-Notes_et_références-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Sommaire" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Basculer la table des matières" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Basculer la table des matières</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Quadrichromie</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Aller à un article dans une autre langue. Disponible en 62 langues." > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-62" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">62 langues</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A7%D9%84%D9%86%D9%85%D9%88%D8%B0%D8%AC_%D8%A7%D9%84%D9%84%D9%88%D9%86%D9%8A_%D8%B3%D9%8A%D8%A7%D9%86_%D9%85%D8%A7%D8%AC%D9%86%D8%AA%D8%A7_%D8%A3%D8%B5%D9%81%D8%B1_%D8%A3%D8%B3%D9%88%D8%AF" title="النموذج اللوني سيان ماجنتا أصفر أسود – arabe" lang="ar" hreflang="ar" data-title="النموذج اللوني سيان ماجنتا أصفر أسود" data-language-autonym="العربية" data-language-local-name="arabe" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/CMYK" title="CMYK – azerbaïdjanais" lang="az" hreflang="az" data-title="CMYK" data-language-autonym="Azərbaycanca" data-language-local-name="azerbaïdjanais" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-bar mw-list-item"><a href="https://bar.wikipedia.org/wiki/CMYK" title="CMYK – bavarois" lang="bar" hreflang="bar" data-title="CMYK" data-language-autonym="Boarisch" data-language-local-name="bavarois" class="interlanguage-link-target"><span>Boarisch</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/CMYK" title="CMYK – biélorusse" lang="be" hreflang="be" data-title="CMYK" data-language-autonym="Беларуская" data-language-local-name="biélorusse" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/CMYK_%D1%86%D0%B2%D0%B5%D1%82%D0%BE%D0%B2%D0%B8_%D0%BC%D0%BE%D0%B4%D0%B5%D0%BB" title="CMYK цветови модел – bulgare" lang="bg" hreflang="bg" data-title="CMYK цветови модел" data-language-autonym="Български" data-language-local-name="bulgare" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%B8%E0%A6%BF%E0%A6%8F%E0%A6%AE%E0%A6%93%E0%A6%AF%E0%A6%BC%E0%A6%BE%E0%A6%87%E0%A6%95%E0%A7%87_%E0%A6%B0%E0%A6%82_%E0%A6%AE%E0%A6%A1%E0%A7%87%E0%A6%B2" title="সিএমওয়াইকে রং মডেল – bengali" lang="bn" hreflang="bn" data-title="সিএমওয়াইকে রং মডেল" data-language-autonym="বাংলা" data-language-local-name="bengali" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/CMYK" title="CMYK – breton" lang="br" hreflang="br" data-title="CMYK" data-language-autonym="Brezhoneg" data-language-local-name="breton" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Model_de_color_CMYK" title="Model de color CMYK – catalan" lang="ca" hreflang="ca" data-title="Model de color CMYK" data-language-autonym="Català" data-language-local-name="catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/CMYK" title="CMYK – tchèque" lang="cs" hreflang="cs" data-title="CMYK" data-language-autonym="Čeština" data-language-local-name="tchèque" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/CMYK" title="CMYK – danois" lang="da" hreflang="da" data-title="CMYK" data-language-autonym="Dansk" data-language-local-name="danois" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/CMYK-Farbmodell" title="CMYK-Farbmodell – allemand" lang="de" hreflang="de" data-title="CMYK-Farbmodell" data-language-autonym="Deutsch" data-language-local-name="allemand" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/CMYK" title="CMYK – grec" lang="el" hreflang="el" data-title="CMYK" data-language-autonym="Ελληνικά" data-language-local-name="grec" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/CMYK_color_model" title="CMYK color model – anglais" lang="en" hreflang="en" data-title="CMYK color model" data-language-autonym="English" data-language-local-name="anglais" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/CMFN_(kolormodelo)" title="CMFN (kolormodelo) – espéranto" lang="eo" hreflang="eo" data-title="CMFN (kolormodelo)" data-language-autonym="Esperanto" data-language-local-name="espéranto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Modelo_de_color_CMYK" title="Modelo de color CMYK – espagnol" lang="es" hreflang="es" data-title="Modelo de color CMYK" data-language-autonym="Español" data-language-local-name="espagnol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/CMYK" title="CMYK – estonien" lang="et" hreflang="et" data-title="CMYK" data-language-autonym="Eesti" data-language-local-name="estonien" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/CMYK_kolore-eredua" title="CMYK kolore-eredua – basque" lang="eu" hreflang="eu" data-title="CMYK kolore-eredua" data-language-autonym="Euskara" data-language-local-name="basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%85%D8%AF%D9%84_%D8%B1%D9%86%DA%AF%DB%8C_%D8%B3%DB%8C%E2%80%8C%D8%A7%D9%85%E2%80%8C%D9%88%D8%A7%DB%8C%E2%80%8C%DA%A9%DB%8C" title="مدل رنگی سی‌ام‌وای‌کی – persan" lang="fa" hreflang="fa" data-title="مدل رنگی سی‌ام‌وای‌کی" data-language-autonym="فارسی" data-language-local-name="persan" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/CMYK" title="CMYK – finnois" lang="fi" hreflang="fi" data-title="CMYK" data-language-autonym="Suomi" data-language-local-name="finnois" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fy mw-list-item"><a href="https://fy.wikipedia.org/wiki/CMYK-kleursysteem" title="CMYK-kleursysteem – frison occidental" lang="fy" hreflang="fy" data-title="CMYK-kleursysteem" data-language-autonym="Frysk" data-language-local-name="frison occidental" class="interlanguage-link-target"><span>Frysk</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Pr%C3%B3iseas_ceithre_dhath" title="Próiseas ceithre dhath – irlandais" lang="ga" hreflang="ga" data-title="Próiseas ceithre dhath" data-language-autonym="Gaeilge" data-language-local-name="irlandais" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/CMYK" title="CMYK – galicien" lang="gl" hreflang="gl" data-title="CMYK" data-language-autonym="Galego" data-language-local-name="galicien" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/CMYK" title="CMYK – hébreu" lang="he" hreflang="he" data-title="CMYK" data-language-autonym="עברית" data-language-local-name="hébreu" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B8%E0%A5%80_%E0%A4%8F%E0%A4%AE_%E0%A4%B5%E0%A4%BE%E0%A4%88_%E0%A4%95%E0%A5%87_%E0%A4%B5%E0%A4%B0%E0%A5%8D%E0%A4%A3_%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%A4%E0%A4%BF%E0%A4%B0%E0%A5%82%E0%A4%AA" title="सी एम वाई के वर्ण प्रतिरूप – hindi" lang="hi" hreflang="hi" data-title="सी एम वाई के वर्ण प्रतिरूप" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/CMYK" title="CMYK – croate" lang="hr" hreflang="hr" data-title="CMYK" data-language-autonym="Hrvatski" data-language-local-name="croate" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/CMYK_sz%C3%ADnt%C3%A9r" title="CMYK színtér – hongrois" lang="hu" hreflang="hu" data-title="CMYK színtér" data-language-autonym="Magyar" data-language-local-name="hongrois" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/CMYK" title="CMYK – arménien" lang="hy" hreflang="hy" data-title="CMYK" data-language-autonym="Հայերեն" data-language-local-name="arménien" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Cyan_Magenta_Yellow_Key_(skala_warna)" title="Cyan Magenta Yellow Key (skala warna) – indonésien" lang="id" hreflang="id" data-title="Cyan Magenta Yellow Key (skala warna)" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonésien" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/CMYK" title="CMYK – islandais" lang="is" hreflang="is" data-title="CMYK" data-language-autonym="Íslenska" data-language-local-name="islandais" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/CMYK" title="CMYK – italien" lang="it" hreflang="it" data-title="CMYK" data-language-autonym="Italiano" data-language-local-name="italien" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/CMYK" title="CMYK – japonais" lang="ja" hreflang="ja" data-title="CMYK" data-language-autonym="日本語" data-language-local-name="japonais" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/CMYK" title="CMYK – coréen" lang="ko" hreflang="ko" data-title="CMYK" data-language-autonym="한국어" data-language-local-name="coréen" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/CMYK" title="CMYK – kurde" lang="ku" hreflang="ku" data-title="CMYK" data-language-autonym="Kurdî" data-language-local-name="kurde" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/CMYK" title="CMYK – lituanien" lang="lt" hreflang="lt" data-title="CMYK" data-language-autonym="Lietuvių" data-language-local-name="lituanien" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Ci%C4%81nfuks%C4%ABndzeltenmelnais_kr%C4%81su_modelis" title="Ciānfuksīndzeltenmelnais krāsu modelis – letton" lang="lv" hreflang="lv" data-title="Ciānfuksīndzeltenmelnais krāsu modelis" data-language-autonym="Latviešu" data-language-local-name="letton" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mhr mw-list-item"><a href="https://mhr.wikipedia.org/wiki/CMYK-%D1%82%D3%B1%D1%81%D0%BC%D0%BE%D0%B4%D0%B5%D0%BB%D1%8C" title="CMYK-тӱсмодель – Eastern Mari" lang="mhr" hreflang="mhr" data-title="CMYK-тӱсмодель" data-language-autonym="Олык марий" data-language-local-name="Eastern Mari" class="interlanguage-link-target"><span>Олык марий</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/CMYK" title="CMYK – macédonien" lang="mk" hreflang="mk" data-title="CMYK" data-language-autonym="Македонски" data-language-local-name="macédonien" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%B8%E0%B4%BF.%E0%B4%8E%E0%B4%82.%E0%B4%B5%E0%B5%88.%E0%B4%95%E0%B5%86._%E0%B4%A8%E0%B4%BF%E0%B4%B1%E0%B4%B5%E0%B5%8D%E0%B4%AF%E0%B4%B5%E0%B4%B8%E0%B5%8D%E0%B4%A5" title="സി.എം.വൈ.കെ. നിറവ്യവസ്ഥ – malayalam" lang="ml" hreflang="ml" data-title="സി.എം.വൈ.കെ. നിറവ്യവസ്ഥ" data-language-autonym="മലയാളം" data-language-local-name="malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Cyan_Magenta_Yellow_Key" title="Cyan Magenta Yellow Key – malais" lang="ms" hreflang="ms" data-title="Cyan Magenta Yellow Key" data-language-autonym="Bahasa Melayu" data-language-local-name="malais" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/CMYK" title="CMYK – néerlandais" lang="nl" hreflang="nl" data-title="CMYK" data-language-autonym="Nederlands" data-language-local-name="néerlandais" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/CMYK" title="CMYK – norvégien bokmål" lang="nb" hreflang="nb" data-title="CMYK" data-language-autonym="Norsk bokmål" data-language-local-name="norvégien bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Quadricromia" title="Quadricromia – occitan" lang="oc" hreflang="oc" data-title="Quadricromia" data-language-autonym="Occitan" data-language-local-name="occitan" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-olo mw-list-item"><a href="https://olo.wikipedia.org/wiki/CMYK" title="CMYK – Livvi-Karelian" lang="olo" hreflang="olo" data-title="CMYK" data-language-autonym="Livvinkarjala" data-language-local-name="Livvi-Karelian" class="interlanguage-link-target"><span>Livvinkarjala</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/CMYK" title="CMYK – polonais" lang="pl" hreflang="pl" data-title="CMYK" data-language-autonym="Polski" data-language-local-name="polonais" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/CMYK" title="CMYK – portugais" lang="pt" hreflang="pt" data-title="CMYK" data-language-autonym="Português" data-language-local-name="portugais" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Modelul_de_culoare_CMYK" title="Modelul de culoare CMYK – roumain" lang="ro" hreflang="ro" data-title="Modelul de culoare CMYK" data-language-autonym="Română" data-language-local-name="roumain" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/CMYK" title="CMYK – russe" lang="ru" hreflang="ru" data-title="CMYK" data-language-autonym="Русский" data-language-local-name="russe" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/CMYK_%E0%B7%80%E0%B6%BB%E0%B7%8A%E0%B6%AB_%E0%B6%86%E0%B6%9A%E0%B7%98%E0%B6%AD%E0%B7%92%E0%B6%BA" title="CMYK වර්ණ ආකෘතිය – cingalais" lang="si" hreflang="si" data-title="CMYK වර්ණ ආකෘතිය" data-language-autonym="සිංහල" data-language-local-name="cingalais" class="interlanguage-link-target"><span>සිංහල</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/CMYK_color_model" title="CMYK color model – Simple English" lang="en-simple" hreflang="en-simple" data-title="CMYK color model" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Barvni_model_CMYK" title="Barvni model CMYK – slovène" lang="sl" hreflang="sl" data-title="Barvni model CMYK" data-language-autonym="Slovenščina" data-language-local-name="slovène" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/CMYK" title="CMYK – albanais" lang="sq" hreflang="sq" data-title="CMYK" data-language-autonym="Shqip" data-language-local-name="albanais" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/CMYK" title="CMYK – serbe" lang="sr" hreflang="sr" data-title="CMYK" data-language-autonym="Српски / srpski" data-language-local-name="serbe" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/CMYK" title="CMYK – suédois" lang="sv" hreflang="sv" data-title="CMYK" data-language-autonym="Svenska" data-language-local-name="suédois" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%A3%E0%B8%B0%E0%B8%9A%E0%B8%9A%E0%B8%AA%E0%B8%B5_CMYK" title="ระบบสี CMYK – thaï" lang="th" hreflang="th" data-title="ระบบสี CMYK" data-language-autonym="ไทย" data-language-local-name="thaï" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/CMYK_renk_modeli" title="CMYK renk modeli – turc" lang="tr" hreflang="tr" data-title="CMYK renk modeli" data-language-autonym="Türkçe" data-language-local-name="turc" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/CMYK" title="CMYK – tatar" lang="tt" hreflang="tt" data-title="CMYK" data-language-autonym="Татарча / tatarça" data-language-local-name="tatar" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/CMYK" title="CMYK – ukrainien" lang="uk" hreflang="uk" data-title="CMYK" data-language-autonym="Українська" data-language-local-name="ukrainien" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D8%B3%DB%8C_%D8%A7%DB%8C%D9%85_%D9%88%D8%A7%D8%A6%DB%8C_%DA%A9%DB%92_%D8%B1%D9%86%DA%AF_%D9%85%D8%A7%DA%88%D9%84" title="سی ایم وائی کے رنگ ماڈل – ourdou" lang="ur" hreflang="ur" data-title="سی ایم وائی کے رنگ ماڈل" data-language-autonym="اردو" data-language-local-name="ourdou" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/M%C3%B4_h%C3%ACnh_m%C3%A0u_CMYK" title="Mô hình màu CMYK – vietnamien" lang="vi" hreflang="vi" data-title="Mô hình màu CMYK" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamien" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E5%8D%B0%E5%88%B7%E5%9B%9B%E5%88%86%E8%89%B2%E6%A8%A1%E5%BC%8F" title="印刷四分色模式 – wu" lang="wuu" hreflang="wuu" data-title="印刷四分色模式" data-language-autonym="吴语" data-language-local-name="wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%8D%B0%E5%88%B7%E5%9B%9B%E5%88%86%E8%89%B2%E6%A8%A1%E5%BC%8F" title="印刷四分色模式 – chinois" lang="zh" hreflang="zh" data-title="印刷四分色模式" data-language-autonym="中文" data-language-local-name="chinois" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a 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id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Apparence</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">déplacer vers la barre latérale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">masquer</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Un article de Wikipédia, l'encyclopédie libre.</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="fr" dir="ltr"><figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/Fichier:CMJN.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/81/CMJN.svg/240px-CMJN.svg.png" decoding="async" width="240" height="240" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/81/CMJN.svg/360px-CMJN.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/81/CMJN.svg/480px-CMJN.svg.png 2x" data-file-width="294" data-file-height="294" /></a><figcaption>Les quatre couleurs de base de la quadrichromie.</figcaption></figure> <p>La <b>quadrichromie</b> est un procédé d'<a href="/wiki/Imprimerie" title="Imprimerie">imprimerie</a> permettant de produire par <a href="/wiki/Synth%C3%A8se_soustractive" title="Synthèse soustractive">synthèse soustractive</a> une large <a href="/wiki/Gamut" title="Gamut">gamme</a> de teintes à partir de trois <a href="/wiki/Couleur_primaire" title="Couleur primaire">teintes dites <i>élémentaires</i></a>, un <a href="/wiki/Bleu" title="Bleu">bleu</a> (appelé « <a href="/wiki/Cyan" title="Cyan">cyan</a> »), un <a href="/wiki/Rouge" title="Rouge">rouge</a> (« <a href="/wiki/Magenta_(couleur)" title="Magenta (couleur)">magenta</a> ») et un <a href="/wiki/Jaune" title="Jaune">jaune</a> auxquelles on ajoute le noir. </p><p>Inventée au <abbr class="abbr" title="18ᵉ siècle"><span class="romain">XVIII</span><sup style="font-size:72%">e</sup></abbr> siècle par <a href="/wiki/Jacob_Christoph_Le_Blon" title="Jacob Christoph Le Blon">Jacob Christoph Le Blon</a>, la synthèse des couleurs imprimées normalise au début du <abbr class="abbr" title="20ᵉ siècle"><span class="romain">XX</span><sup style="font-size:72%">e</sup></abbr> siècle la composition spectrale et la transparence des encres de couleurs pour permettre l'utilisation commune de la <a href="/wiki/S%C3%A9paration_quadrichromique" title="Séparation quadrichromique">séparation quadrichromique</a> et obtenir un <a href="/wiki/Gamut" title="Gamut">gamut</a> convenant au maximum de sujets. Le nom du <a href="/wiki/Bleu-vert" title="Bleu-vert">bleu-vert</a> normalisé est <a href="/wiki/Cyan" title="Cyan">cyan</a> et celui du rouge violacé normalisé est <a href="/wiki/Magenta_(couleur)" title="Magenta (couleur)">magenta</a><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite_crochet">[</span>1<span class="cite_crochet">]</span></a></sup>. On désigne à l'occasion la quadrichromie par le sigle <b>CMJN</b> (pour, cyan-magenta-jaune-noir) ou en anglais <b>CMYK</b>, <i><span class="lang-en" lang="en">cyan, magenta, yellow, key</span></i> où <i><span class="lang-en" lang="en">key</span></i> signifie <i><a href="/wiki/Valeur_(arts_visuels)" title="Valeur (arts visuels)">valeur</a></i>), </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Procédé"><span id="Proc.C3.A9d.C3.A9"></span>Procédé</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=1" title="Modifier la section : Procédé" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=1" title="Modifier le code source de la section : Procédé"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Principe">Principe</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=2" title="Modifier la section : Principe" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=2" title="Modifier le code source de la section : Principe"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Dans le principe de la <a href="/wiki/Synth%C3%A8se_soustractive" title="Synthèse soustractive">synthèse soustractive</a>, chacune des encres cyan, magenta et jaune contrôle le niveau de sa <a href="/wiki/Couleur_compl%C3%A9mentaire" title="Couleur complémentaire">couleur complémentaire</a>, une <a href="/wiki/Couleur_primaire" title="Couleur primaire">couleur primaire</a> de la <a href="/wiki/Synth%C3%A8se_additive" title="Synthèse additive">synthèse additive</a> des couleurs, respectivement un <a href="/wiki/Rouge" title="Rouge">rouge</a>, un <a href="/wiki/Vert" title="Vert">vert</a> et un <a href="/wiki/Bleu" title="Bleu">bleu</a>. </p><p>Le mélange des encres cyan, magenta et jaune produit du noir. Dans le procédé quadrichromique, le <i>retrait de sous-couleur</i> diminue la quantité d'<a href="/wiki/Encre" title="Encre">encre</a> ou de <a href="/wiki/Toner" title="Toner">toner</a> à déposer sur le support en remplaçant ce mélange par de l'encre noire. On évite ainsi des problèmes de surcharge et de séchage. Pour faire un <a href="/wiki/Gris" title="Gris">gris</a> avec du noir, il n'en faut qu'une goutte, au lieu de trois avec le mélange des trois couleurs de base. En séparant la luminosité de la coloration, le noir simplifie la <a href="/wiki/S%C3%A9paration_quadrichromique" title="Séparation quadrichromique">séparation quadrichromique</a>. La constitution d'une <a href="/wiki/Niveau_de_gris" title="Niveau de gris">échelle de gris</a> tous neutres serait plus difficile en mélangeant seulement les trois couleurs primaires ; les colorants sont imparfaits et la teinte obtenue par leur mélange varie selon la quantité de colorant quand leur proportion reste égale (<a href="#Sève2009">Sève 2009</a>, <abbr class="abbr" title="page(s)">p.</abbr> 200). Les colorants noirs peuvent d'ailleurs être plus <a href="/wiki/Couleur_profonde" title="Couleur profonde">profonds</a> que celui obtenu par mélange. L'ajout du noir permet de mieux <a href="/wiki/Contraste" title="Contraste">contraster</a> les images et de produire des textes plus nets. </p><p>Le noir étant une couleur moins coûteuse à fabriquer que les autres teintes, son utilité est non seulement d'ordre technique et esthétique mais aussi économique<sup class="need_ref_tag" style="padding-left:2px;"><a href="/wiki/Aide:R%C3%A9f%C3%A9rence_n%C3%A9cessaire" title="Aide:Référence nécessaire">[<abbr class="abbr" title="référence">réf.</abbr> souhaitée]</a></sup>. </p> <div class="mw-heading mw-heading3"><h3 id="Application">Application</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=3" title="Modifier la section : Application" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=3" title="Modifier le code source de la section : Application"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fichier:Comparaison_de_diff%C3%A9rents_Gamuts.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1a/Comparaison_de_diff%C3%A9rents_Gamuts.svg/220px-Comparaison_de_diff%C3%A9rents_Gamuts.svg.png" decoding="async" width="220" height="234" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1a/Comparaison_de_diff%C3%A9rents_Gamuts.svg/330px-Comparaison_de_diff%C3%A9rents_Gamuts.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1a/Comparaison_de_diff%C3%A9rents_Gamuts.svg/440px-Comparaison_de_diff%C3%A9rents_Gamuts.svg.png 2x" data-file-width="495" data-file-height="526" /></a><figcaption>Les <a href="/wiki/Gamut" title="Gamut">gamuts</a> sont des triangles en synthèse additive, pas en synthèse soustractive.</figcaption></figure> <p>Si les encres d'impression étaient des <i>teintures bloc</i> donnant des <a href="/wiki/Couleur_optimale" title="Couleur optimale">couleurs optimales</a>, une arithmétique très simple permettrait de passer de la définition en synthèse additive <i>r</i>, <i>v</i>, <i>b</i> utilisé pour les écrans et les coordonnées <i>c</i>, <i>m</i>, <i>j</i>, <i>n</i> du modèle CMJN utilisé pour l'impression. La <a href="/wiki/S%C3%A9paration_quadrichromique" title="Séparation quadrichromique">séparation quadrichromique</a> serait alors une simple conversion linéaire. Le <a href="/wiki/Gamut" title="Gamut">gamut</a> CMJN serait un triangle dont les pointes occuperaient exactement la position des primaires de la synthèse additive. Ce n'est pas du tout le cas. </p><p>Les encres réelles, telles que normalisées par l'ISO 2846, absorbent dans des régions du spectre où elles devraient transmettre, et de ce fait, la densité des encres fait varier la position des primaires (<a href="#Sève2009">Sève 2009</a>, <abbr class="abbr" title="page(s)">p.</abbr> 201). La <a href="/wiki/Lin%C3%A9arit%C3%A9" title="Linéarité">linéarité</a> que suppose la conversion arithmétique n'existe pas. </p><p>La <a href="/wiki/S%C3%A9paration_quadrichromique" title="Séparation quadrichromique">séparation quadrichromique</a> est, de ce fait, une opération complexe, qui peut impliquer une appréciation des compromis à réaliser pour produire une image d'un sujet donné. </p> <div class="mw-heading mw-heading3"><h3 id="Exemple">Exemple</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=4" title="Modifier la section : Exemple" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=4" title="Modifier le code source de la section : Exemple"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="clear" style="clear:both;"></div> <center> <p><span typeof="mw:File"><a href="/wiki/Fichier:La_Boqueria_color_enhanced.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/79/La_Boqueria_color_enhanced.jpg/150px-La_Boqueria_color_enhanced.jpg" decoding="async" width="150" height="113" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/79/La_Boqueria_color_enhanced.jpg/225px-La_Boqueria_color_enhanced.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/79/La_Boqueria_color_enhanced.jpg/300px-La_Boqueria_color_enhanced.jpg 2x" data-file-width="800" data-file-height="600" /></a></span><br /> Photo de référence : un étalage de fruits. </p><p><span typeof="mw:File"><a href="/wiki/Fichier:La_Boqueria_newspaper_CMYK_channels.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/78/La_Boqueria_newspaper_CMYK_channels.jpg/600px-La_Boqueria_newspaper_CMYK_channels.jpg" decoding="async" width="600" height="113" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/78/La_Boqueria_newspaper_CMYK_channels.jpg/900px-La_Boqueria_newspaper_CMYK_channels.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/78/La_Boqueria_newspaper_CMYK_channels.jpg/1200px-La_Boqueria_newspaper_CMYK_channels.jpg 2x" data-file-width="3200" data-file-height="600" /></a></span><br /> <a href="/wiki/S%C3%A9paration_quadrichromique" title="Séparation quadrichromique">Séparation quadrichromique</a><br /> de gauche à droite : couche <a href="/wiki/Cyan" title="Cyan">cyan</a>, couche <a href="/wiki/Magenta_(couleur)" title="Magenta (couleur)">magenta</a>, couche <a href="/wiki/Jaune" title="Jaune">jaune</a> et couche noire. </p><p><span typeof="mw:File"><a href="/wiki/Fichier:La_Boqueria_newspaper_CMY_overprints.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/ba/La_Boqueria_newspaper_CMY_overprints.jpg/600px-La_Boqueria_newspaper_CMY_overprints.jpg" decoding="async" width="600" height="113" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/ba/La_Boqueria_newspaper_CMY_overprints.jpg/900px-La_Boqueria_newspaper_CMY_overprints.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/ba/La_Boqueria_newspaper_CMY_overprints.jpg/1200px-La_Boqueria_newspaper_CMY_overprints.jpg 2x" data-file-width="3200" data-file-height="600" /></a></span><br /> Superpositions des trois primaires.<br /> De gauche à droite : magenta+jaune, cyan+jaune, cyan+magenta, cyan+magenta+jaune. </p><p><span typeof="mw:File"><a href="/wiki/Fichier:La_Boqueria_newspaper_CMY_channels_and_overprints_with_Black.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/af/La_Boqueria_newspaper_CMY_channels_and_overprints_with_Black.jpg/600px-La_Boqueria_newspaper_CMY_channels_and_overprints_with_Black.jpg" decoding="async" width="600" height="300" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/af/La_Boqueria_newspaper_CMY_channels_and_overprints_with_Black.jpg/900px-La_Boqueria_newspaper_CMY_channels_and_overprints_with_Black.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/af/La_Boqueria_newspaper_CMY_channels_and_overprints_with_Black.jpg/1200px-La_Boqueria_newspaper_CMY_channels_and_overprints_with_Black.jpg 2x" data-file-width="2400" data-file-height="1200" /></a></span><br /> Superposition des canaux cyan, magenta, jaune ainsi que leur couleur complémentaire avec un noir.<br /> De gauche à droite, haut en bas : cyan+noir, magenta+noir, jaune+noir, magenta+jaune+noir, cyan+jaune+noir, cyan+magenta+noir. </p> </center> <div class="mw-heading mw-heading3"><h3 id="Limites_et_améliorations"><span id="Limites_et_am.C3.A9liorations"></span>Limites et améliorations</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=5" title="Modifier la section : Limites et améliorations" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=5" title="Modifier le code source de la section : Limites et améliorations"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>La quadrichromie est un moyen commode de reproduire un grand nombre de couleurs, mais il lui est impossible de reproduire certaines couleurs vives. L'exemple ci-dessous montre que, même si le résultat obtenu est satisfaisant, certaines couleurs s'affaiblissent entre leur représentation en <a href="/wiki/Rouge-vert-bleu" title="Rouge-vert-bleu">rouge-vert-bleu</a> à l'écran et leur production quadrichromique. On le remarque particulièrement sur les fruits orangés (<a href="/wiki/Orange_(fruit)" title="Orange (fruit)">oranges</a>, <a href="/wiki/Citrouille" title="Citrouille">citrouilles</a>, <a href="/wiki/Mandarine" title="Mandarine">mandarines</a>), la couleur orange vif étant impossible à reproduire exactement en quadrichromie, et sur les <a href="/wiki/Pitaya" title="Pitaya">pitayas</a> (rose vif) qui ternissent légèrement. </p> <figure class="mw-halign-center" typeof="mw:File/Thumb"><a href="/wiki/Fichier:La_Boqueria_RGB_VS_CMYK.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e4/La_Boqueria_RGB_VS_CMYK.jpg/600px-La_Boqueria_RGB_VS_CMYK.jpg" decoding="async" width="600" height="225" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e4/La_Boqueria_RGB_VS_CMYK.jpg/900px-La_Boqueria_RGB_VS_CMYK.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e4/La_Boqueria_RGB_VS_CMYK.jpg/1200px-La_Boqueria_RGB_VS_CMYK.jpg 2x" data-file-width="1600" data-file-height="600" /></a><figcaption>À gauche, photo en mode RVB, à droite, avec des couleurs que l'on peut obtenir en quadri.</figcaption></figure> <p>On peut obtenir un noir plus intense, dit <a href="/wiki/Noir_soutenu" title="Noir soutenu">noir soutenu</a>, en ajoutant une couleur supplémentaire (en général du cyan) à l'encre noire. </p><p>La quadrichromie est un procédé industriel entièrement normalisé, ce qui permet d'obtenir, avec les mêmes éléments, qu'ils soient films, plaques ou fichiers, des résultats similaires avec des installations différentes. Les encres sont choisies pour rendre correctement les images les plus courantes. Dans certains domaines, comme la reproduction d'œuvres d'art, on utilise parfois des encres spécialement sélectionnées pour un <a href="/wiki/Gamut" title="Gamut">gamut</a> particulier. </p><p>Des techniques de reproduction comme l'<a href="/wiki/Hexachromie" title="Hexachromie">hexachromie</a> permettent soit une extension du gamut, soit une amélioration de la finesse de la reproduction des couleurs les plus pâles, pour lesquelles la <a href="/wiki/Trame_(imprimerie)" title="Trame (imprimerie)">trame</a> est plus visible. </p> <div class="mw-heading mw-heading2"><h2 id="Transformations_entre_CMJN_et_RVB">Transformations entre CMJN et RVB</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=6" title="Modifier la section : Transformations entre CMJN et RVB" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=6" title="Modifier le code source de la section : Transformations entre CMJN et RVB"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Généralités"><span id="G.C3.A9n.C3.A9ralit.C3.A9s"></span>Généralités</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=7" title="Modifier la section : Généralités" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=7" title="Modifier le code source de la section : Généralités"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>En pratique, on ne peut obtenir en quadrichromie qu'une partie des couleurs possibles sur l'écran<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite_crochet">[</span>a<span class="cite_crochet">]</span></a></sup>. Il faut donc faire attention pour les fichiers numériques destinés à l'impression. Dans les palettes de <a href="/wiki/Photoshop" class="mw-redirect" title="Photoshop">Photoshop</a>, par exemple, en mode CMJN, un point d'exclamation signale les couleurs « non imprimables ». </p><p>Pour obtenir la meilleure reproduction possible en impression contrôlée par ordinateur, le système de <a href="/wiki/Gestion_de_la_couleur" title="Gestion de la couleur">gestion de la couleur</a> utilise un <a href="/wiki/Profil_ICC" title="Profil ICC">profil colorimétrique</a> de l'imprimante. Ce « profil » se constitue à partir de l'analyse <a href="/wiki/Colorim%C3%A9trie" title="Colorimétrie">colorimétrique</a> d'un document imprimé avec des codes de couleur connus. On obtient un tableau des couleurs obtenues en fonction des codes, qui permet par <a href="/wiki/Extrapolation_(math%C3%A9matiques)" title="Extrapolation (mathématiques)">extrapolation</a> les conversions nécessaires, du code représentant la couleur en mémoire vers celui représentant la couleur obtenue par impression. </p><p><b>Aucune des méthodes de conversion présentées ci-dessous n'est une séparation quadrichromique réaliste</b>. </p><p>Par ailleurs : </p> <ol><li>Les modèles <a href="/wiki/Rouge-vert-bleu" title="Rouge-vert-bleu">RVB</a> et CMJN dépendent beaucoup des caractéristiques physiques des dispositifs utilisés : technologie d'affichage, nature du papier et des encres, technologie d'impression. Les formules exposées ci-dessous ne prennent en compte ni les <a href="/wiki/Gamut" title="Gamut">gamuts</a> ni les <a href="/wiki/Profil_ICC" title="Profil ICC">profils</a> des matériels concernés.</li> <li>Il existe deux algorithmes différents pour calculer les proportions d'encre de couleur <i>c</i>, <i>m</i> et <i>j</i>. Le premier, utilisé par exemple par la <a href="/wiki/Suite_bureautique" title="Suite bureautique">suite bureautique</a> <a href="/wiki/LibreOffice" title="LibreOffice">LibreOffice</a>, calcule les proportions de couleur par rapport à l'espace total (donc y compris l'espace occupé par le noir). Le second, utilisé par exemple par le logiciel de <a href="/wiki/Traitement_d%27image" class="mw-redirect" title="Traitement d'image">traitement d'image</a> <a href="/wiki/GIMP" title="GIMP">GIMP</a> calcule les proportions de couleur par rapport à l'espace blanc (donc non compris l'espace occupé par le noir).</li></ol> <table border="1" align="center" cellspacing="0" cellpadding="2" style="border-collapse:collapse"> <caption>Comparaison des deux algorithmes couramment utilisés<br />Couleur témoin : olivedrab RVB (107, 142, 35) </caption> <tbody><tr> <td align="center">Algorithme <abbr class="abbr" title="numéro">n<sup>o</sup></abbr> 1 <br />(proportions calculées sur l'espace total) </td> <td align="center">Algorithme <abbr class="abbr" title="numéro">n<sup>o</sup></abbr> 2 <br />(proportions calculées sur l'espace blanc) </td></tr> <tr> <td><span typeof="mw:File"><a href="/wiki/Fichier:Ooo_s%C3%A9lection_de_couleur_RVB_CMJN_olivedrab.png" class="mw-file-description" title="Calcul LibreOffice"><img alt="Calcul LibreOffice" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/82/Ooo_s%C3%A9lection_de_couleur_RVB_CMJN_olivedrab.png/410px-Ooo_s%C3%A9lection_de_couleur_RVB_CMJN_olivedrab.png" decoding="async" width="410" height="259" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/8/82/Ooo_s%C3%A9lection_de_couleur_RVB_CMJN_olivedrab.png 1.5x" data-file-width="539" data-file-height="341" /></a></span> </td> <td><span typeof="mw:File"><a href="/wiki/Fichier:GIMP_s%C3%A9lection_de_couleur_RVB_CMJN_olivedrab.png" class="mw-file-description" title="Calcul GIMP"><img alt="Calcul GIMP" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/GIMP_s%C3%A9lection_de_couleur_RVB_CMJN_olivedrab.png/390px-GIMP_s%C3%A9lection_de_couleur_RVB_CMJN_olivedrab.png" decoding="async" width="390" height="264" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/a/aa/GIMP_s%C3%A9lection_de_couleur_RVB_CMJN_olivedrab.png 1.5x" data-file-width="512" data-file-height="346" /></a></span> </td></tr> <tr> <td align="center">CMJN calculé par LibreOffice : (14, 0, 42, 44) </td> <td align="center">CMJN calculé par GIMP : (25, 0, 75, 44) </td></tr></tbody></table> <div class="mw-heading mw-heading3"><h3 id="Principes">Principes</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=8" title="Modifier la section : Principes" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=8" title="Modifier le code source de la section : Principes"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/Fichier:CMYK_farbwuerfel.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/93/CMYK_farbwuerfel.jpg/240px-CMYK_farbwuerfel.jpg" decoding="async" width="240" height="72" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/93/CMYK_farbwuerfel.jpg/360px-CMYK_farbwuerfel.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/93/CMYK_farbwuerfel.jpg/480px-CMYK_farbwuerfel.jpg 2x" data-file-width="777" data-file-height="234" /></a><figcaption>L'espace colorimétrique de la quadrichromie représenté en <a href="/wiki/Trois_dimensions" title="Trois dimensions">trois dimensions</a>.</figcaption></figure> <p>Dans une première étape<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite_crochet">[</span>2<span class="cite_crochet">]</span></a></sup><sup class="reference cite_virgule">,</sup><sup id="cite_ref-Poynton_4-0" class="reference"><a href="#cite_note-Poynton-4"><span class="cite_crochet">[</span>3<span class="cite_crochet">]</span></a></sup>, on convertit les coordonnées RVB en coordonnées CMJ (cyan, magenta, jaune). Cette transformation est aisée puisqu'il suffit de passer d'une logique additive, où l'on « ajoute » des couleurs au noir, à une logique soustractive, où on « retranche » des couleurs au blanc. </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \left({\begin{smallmatrix}C\\M\\J\end{smallmatrix}}\right)=\left({\begin{smallmatrix}1\\1\\1\end{smallmatrix}}\right)-\left({\begin{smallmatrix}R\\V\\B\end{smallmatrix}}\right)}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow> <mo>(</mo> <mrow class="MJX-TeXAtom-ORD"> <mstyle scriptlevel="1"> <mtable rowspacing=".2em" columnspacing="0.333em" displaystyle="false"> <mtr> <mtd> <mi>C</mi> </mtd> </mtr> <mtr> <mtd> <mi>M</mi> </mtd> </mtr> <mtr> <mtd> <mi>J</mi> </mtd> </mtr> </mtable> </mstyle> </mrow> <mo>)</mo> </mrow> <mo>=</mo> <mrow> <mo>(</mo> <mrow class="MJX-TeXAtom-ORD"> <mstyle scriptlevel="1"> <mtable rowspacing=".2em" columnspacing="0.333em" displaystyle="false"> <mtr> <mtd> <mn>1</mn> </mtd> </mtr> <mtr> <mtd> <mn>1</mn> </mtd> </mtr> <mtr> <mtd> <mn>1</mn> </mtd> </mtr> </mtable> </mstyle> </mrow> <mo>)</mo> </mrow> <mo>−</mo> <mrow> <mo>(</mo> <mrow class="MJX-TeXAtom-ORD"> <mstyle scriptlevel="1"> <mtable rowspacing=".2em" columnspacing="0.333em" displaystyle="false"> <mtr> <mtd> <mi>R</mi> </mtd> </mtr> <mtr> <mtd> <mi>V</mi> </mtd> </mtr> <mtr> <mtd> <mi>B</mi> </mtd> </mtr> </mtable> </mstyle> </mrow> <mo>)</mo> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \left({\begin{smallmatrix}C\\M\\J\end{smallmatrix}}\right)=\left({\begin{smallmatrix}1\\1\\1\end{smallmatrix}}\right)-\left({\begin{smallmatrix}R\\V\\B\end{smallmatrix}}\right)}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c4f4eb2ffce5b91f135c29651c72f85ba8fe3fdd" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.505ex; width:21.624ex; height:6.176ex;" alt="{\displaystyle \left({\begin{smallmatrix}C\\M\\J\end{smallmatrix}}\right)=\left({\begin{smallmatrix}1\\1\\1\end{smallmatrix}}\right)-\left({\begin{smallmatrix}R\\V\\B\end{smallmatrix}}\right)}"></span></dd></dl> <p>Dans une deuxième étape, on calcule la quantité de noir (c'est le minimum des trois valeurs <i>c</i>, <i>m</i>, et <i>j</i>) et on la soustrait aux quantités précédemment calculées. </p><p>Dans une troisième étape, qui selon l'algorithme utilisé, se fait<sup id="cite_ref-Poynton_4-1" class="reference"><a href="#cite_note-Poynton-4"><span class="cite_crochet">[</span>3<span class="cite_crochet">]</span></a></sup> ou ne se fait pas<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite_crochet">[</span>4<span class="cite_crochet">]</span></a></sup>, on réajuste les proportions en fonction de la quantité de noir utilisée. </p><p>La conversion de CMJN vers RVB suit le chemin inverse. </p> <div class="mw-heading mw-heading3"><h3 id="Conversion_de_RVB_vers_CMJN">Conversion de RVB vers CMJN</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=9" title="Modifier la section : Conversion de RVB vers CMJN" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=9" title="Modifier le code source de la section : Conversion de RVB vers CMJN"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Soient <i>r</i>, <i>v</i>, <i>b</i> ∈ [0, 1] les coordonnées rouge, verte et bleue de la couleur étudiée dans l'espace RVB. <i>Le cas échéant, il faudra transposer les coordonnées </i>r<i>, </i>v<i>, </i>b<i> de l'<a href="/wiki/Intervalle_(math%C3%A9matiques)" title="Intervalle (mathématiques)">intervalle</a> [0, 255] vers l'intervalle [0, 1]</i>. </p> <div class="mw-heading mw-heading4"><h4 id="Calcul_des_coordonnées_C,_M,_J_de_l'espace_CMJ"><span id="Calcul_des_coordonn.C3.A9es_C.2C_M.2C_J_de_l.27espace_CMJ"></span>Calcul des coordonnées <i>C</i>, <i>M</i>, <i>J</i> de l'espace CMJ</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=10" title="Modifier la section : Calcul des coordonnées C, M, J de l'espace CMJ" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=10" title="Modifier le code source de la section : Calcul des coordonnées C, M, J de l'espace CMJ"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><br /> </p> <table border="1" align="center" cellspacing="0" cellpadding="2" style="border-collapse:collapse"> <tbody><tr> <td align="center" width="300px">Algorithme <abbr class="abbr" title="numéro">n<sup>o</sup></abbr> 1 <br />(proportions calculées sur l'espace total) </td> <td align="center" width="300px">Algorithme <abbr class="abbr" title="numéro">n<sup>o</sup></abbr> 2 <br />(proportions calculées sur l'espace blanc) </td></tr> <tr> <td style="vertical-align:top;"> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle C=1-r}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>C</mi> <mo>=</mo> <mn>1</mn> <mo>−</mo> <mi>r</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle C=1-r}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/bc9babfb7de7c016061df9a328d582366ee8c1fb" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:9.916ex; height:2.343ex;" alt="{\displaystyle C=1-r}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle M=1-v}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>M</mi> <mo>=</mo> <mn>1</mn> <mo>−</mo> <mi>v</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle M=1-v}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1c021ff6a8e07752f5664a281916b73ee98c1d89" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:10.671ex; height:2.343ex;" alt="{\displaystyle M=1-v}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle J=1-b}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>J</mi> <mo>=</mo> <mn>1</mn> <mo>−</mo> <mi>b</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle J=1-b}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/d81c14f23770cb903f827d94fcbd664fc52b7e56" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:9.57ex; height:2.343ex;" alt="{\displaystyle J=1-b}"></span></dd></dl> </td> <td style="vertical-align:top;"> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle C=1-r}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>C</mi> <mo>=</mo> <mn>1</mn> <mo>−</mo> <mi>r</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle C=1-r}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/bc9babfb7de7c016061df9a328d582366ee8c1fb" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:9.916ex; height:2.343ex;" alt="{\displaystyle C=1-r}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle M=1-v}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>M</mi> <mo>=</mo> <mn>1</mn> <mo>−</mo> <mi>v</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle M=1-v}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1c021ff6a8e07752f5664a281916b73ee98c1d89" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:10.671ex; height:2.343ex;" alt="{\displaystyle M=1-v}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle J=1-b}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>J</mi> <mo>=</mo> <mn>1</mn> <mo>−</mo> <mi>b</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle J=1-b}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/d81c14f23770cb903f827d94fcbd664fc52b7e56" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:9.57ex; height:2.343ex;" alt="{\displaystyle J=1-b}"></span></dd></dl> </td></tr></tbody></table> <div class="mw-heading mw-heading4"><h4 id="Calcul_des_coordonnées_c,_m,_j,_n_de_l'espace_CMJN"><span id="Calcul_des_coordonn.C3.A9es_c.2C_m.2C_j.2C_n_de_l.27espace_CMJN"></span>Calcul des coordonnées <i>c</i>, <i>m</i>, <i>j</i>, <i>n</i> de l'espace CMJN</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=11" title="Modifier la section : Calcul des coordonnées c, m, j, n de l'espace CMJN" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=11" title="Modifier le code source de la section : Calcul des coordonnées c, m, j, n de l'espace CMJN"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><br /> </p> <table border="1" align="center" cellspacing="0" cellpadding="2" style="border-collapse:collapse"> <tbody><tr> <td align="center" width="300px">Algorithme <abbr class="abbr" title="numéro">n<sup>o</sup></abbr> 1 <br />(proportions calculées sur l'espace total) </td> <td align="center" width="300px">Algorithme <abbr class="abbr" title="numéro">n<sup>o</sup></abbr> 2 <br />(proportions calculées sur l'espace blanc) </td></tr> <tr> <td style="vertical-align:top;"> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle n=\min(C,\,M,\,J)}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>n</mi> <mo>=</mo> <mo movablelimits="true" form="prefix">min</mo> <mo stretchy="false">(</mo> <mi>C</mi> <mo>,</mo> <mspace width="thinmathspace" /> <mi>M</mi> <mo>,</mo> <mspace width="thinmathspace" /> <mi>J</mi> <mo stretchy="false">)</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle n=\min(C,\,M,\,J)}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/35b949f29c6df99c9e5dd1a6d8b320c0cbec8e66" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:18.7ex; height:2.843ex;" alt="{\displaystyle n=\min(C,\,M,\,J)}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\mbox{si }}n=1\ {\begin{cases}c=0\\m=0\\j=0\end{cases}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="false" scriptlevel="0"> <mtext>si </mtext> </mstyle> </mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mrow> <mo>{</mo> <mtable columnalign="left left" rowspacing=".2em" columnspacing="1em" displaystyle="false"> <mtr> <mtd> <mi>c</mi> <mo>=</mo> <mn>0</mn> </mtd> </mtr> <mtr> <mtd> <mi>m</mi> <mo>=</mo> <mn>0</mn> </mtd> </mtr> <mtr> <mtd> <mi>j</mi> <mo>=</mo> <mn>0</mn> </mtd> </mtr> </mtable> <mo fence="true" stretchy="true" symmetric="true"></mo> </mrow> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\mbox{si }}n=1\ {\begin{cases}c=0\\m=0\\j=0\end{cases}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/f2e9b2006a61bb4e546801978918a8cb12db366b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -3.671ex; width:17.499ex; height:8.509ex;" alt="{\displaystyle {\mbox{si }}n=1\ {\begin{cases}c=0\\m=0\\j=0\end{cases}}}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\mbox{sinon }}{\begin{cases}c=C-n\\m=M-n\\j=J-n\end{cases}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="false" scriptlevel="0"> <mtext>sinon </mtext> </mstyle> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mrow> <mo>{</mo> <mtable columnalign="left left" rowspacing=".2em" columnspacing="1em" displaystyle="false"> <mtr> <mtd> <mi>c</mi> <mo>=</mo> <mi>C</mi> <mo>−</mo> <mi>n</mi> </mtd> </mtr> <mtr> <mtd> <mi>m</mi> <mo>=</mo> <mi>M</mi> <mo>−</mo> <mi>n</mi> </mtd> </mtr> <mtr> <mtd> <mi>j</mi> <mo>=</mo> <mi>J</mi> <mo>−</mo> <mi>n</mi> </mtd> </mtr> </mtable> <mo fence="true" stretchy="true" symmetric="true"></mo> </mrow> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\mbox{sinon }}{\begin{cases}c=C-n\\m=M-n\\j=J-n\end{cases}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/64f66161b61ddcfaabbf421013548ec7d5ee6452" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -3.671ex; width:20.525ex; height:8.509ex;" alt="{\displaystyle {\mbox{sinon }}{\begin{cases}c=C-n\\m=M-n\\j=J-n\end{cases}}}"></span></dd></dl> </td> <td> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle n=\min(C,\,M,\,J)}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>n</mi> <mo>=</mo> <mo movablelimits="true" form="prefix">min</mo> <mo stretchy="false">(</mo> <mi>C</mi> <mo>,</mo> <mspace width="thinmathspace" /> <mi>M</mi> <mo>,</mo> <mspace width="thinmathspace" /> <mi>J</mi> <mo stretchy="false">)</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle n=\min(C,\,M,\,J)}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/35b949f29c6df99c9e5dd1a6d8b320c0cbec8e66" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:18.7ex; height:2.843ex;" alt="{\displaystyle n=\min(C,\,M,\,J)}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\mbox{si }}n=1\ {\begin{cases}c=0\\m=0\\j=0\end{cases}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="false" scriptlevel="0"> <mtext>si </mtext> </mstyle> </mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mrow> <mo>{</mo> <mtable columnalign="left left" rowspacing=".2em" columnspacing="1em" displaystyle="false"> <mtr> <mtd> <mi>c</mi> <mo>=</mo> <mn>0</mn> </mtd> </mtr> <mtr> <mtd> <mi>m</mi> <mo>=</mo> <mn>0</mn> </mtd> </mtr> <mtr> <mtd> <mi>j</mi> <mo>=</mo> <mn>0</mn> </mtd> </mtr> </mtable> <mo fence="true" stretchy="true" symmetric="true"></mo> </mrow> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\mbox{si }}n=1\ {\begin{cases}c=0\\m=0\\j=0\end{cases}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/f2e9b2006a61bb4e546801978918a8cb12db366b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -3.671ex; width:17.499ex; height:8.509ex;" alt="{\displaystyle {\mbox{si }}n=1\ {\begin{cases}c=0\\m=0\\j=0\end{cases}}}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\mbox{sinon }}{\begin{cases}c=\displaystyle {\frac {C-n}{1-n}}\\m=\displaystyle {\frac {M-n}{1-n}}\\j=\displaystyle {\frac {J-n}{1-n}}\end{cases}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="false" scriptlevel="0"> <mtext>sinon </mtext> </mstyle> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mrow> <mo>{</mo> <mtable columnalign="left left" rowspacing=".2em" columnspacing="1em" displaystyle="false"> <mtr> <mtd> <mi>c</mi> <mo>=</mo> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>C</mi> <mo>−</mo> <mi>n</mi> </mrow> <mrow> <mn>1</mn> <mo>−</mo> <mi>n</mi> </mrow> </mfrac> </mrow> </mstyle> </mtd> </mtr> <mtr> <mtd> <mi>m</mi> <mo>=</mo> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>M</mi> <mo>−</mo> <mi>n</mi> </mrow> <mrow> <mn>1</mn> <mo>−</mo> <mi>n</mi> </mrow> </mfrac> </mrow> </mstyle> </mtd> </mtr> <mtr> <mtd> <mi>j</mi> <mo>=</mo> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>J</mi> <mo>−</mo> <mi>n</mi> </mrow> <mrow> <mn>1</mn> <mo>−</mo> <mi>n</mi> </mrow> </mfrac> </mrow> </mstyle> </mtd> </mtr> </mtable> <mo fence="true" stretchy="true" symmetric="true"></mo> </mrow> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\mbox{sinon }}{\begin{cases}c=\displaystyle {\frac {C-n}{1-n}}\\m=\displaystyle {\frac {M-n}{1-n}}\\j=\displaystyle {\frac {J-n}{1-n}}\end{cases}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/86f08f1723f02d9abd8fedd94f68c31c2161a52c" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -7.331ex; margin-bottom: -0.174ex; width:21.361ex; height:16.176ex;" alt="{\displaystyle {\mbox{sinon }}{\begin{cases}c=\displaystyle {\frac {C-n}{1-n}}\\m=\displaystyle {\frac {M-n}{1-n}}\\j=\displaystyle {\frac {J-n}{1-n}}\end{cases}}}"></span></dd></dl> </td></tr> <tr> <td colspan="2"><i>Les valeurs résultantes pour </i>c<i>, </i>m<i>, </i>j<i>, </i>n<i> sont dans l'<a href="/wiki/Intervalle_(math%C3%A9matiques)" title="Intervalle (mathématiques)">intervalle</a> [0, 1]. Elles sont ensuite généralement normalisées en valeurs entre 0 et 100.</i> </td></tr></tbody></table> <div class="mw-heading mw-heading3"><h3 id="Conversion_de_CMJN_vers_RVB">Conversion de CMJN vers RVB</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=12" title="Modifier la section : Conversion de CMJN vers RVB" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=12" title="Modifier le code source de la section : Conversion de CMJN vers RVB"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Soient <i>c</i>, <i>m</i>, <i>j</i>, <i>n</i> ∈ [0, 1] les coordonnées cyan, magenta, jaune et noire de la couleur étudiée dans l'espace CMJN. </p> <div class="mw-heading mw-heading4"><h4 id="Calcul_des_composantes_C,_M,_J_de_l'espace_CMJ"><span id="Calcul_des_composantes_C.2C_M.2C_J_de_l.27espace_CMJ"></span>Calcul des composantes <i>C</i>, <i>M</i>, <i>J</i> de l'espace CMJ</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=13" title="Modifier la section : Calcul des composantes C, M, J de l'espace CMJ" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=13" title="Modifier le code source de la section : Calcul des composantes C, M, J de l'espace CMJ"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><br /> </p> <table border="1" align="center" cellspacing="0" cellpadding="2" style="border-collapse:collapse"> <tbody><tr> <td align="center" width="300px">Algorithme <abbr class="abbr" title="numéro">n<sup>o</sup></abbr> 1 <br />(proportions calculées sur l'espace total) </td> <td align="center" width="300px">Algorithme <abbr class="abbr" title="numéro">n<sup>o</sup></abbr> 2 <br />(proportions calculées sur l'espace blanc) </td></tr> <tr> <td style="vertical-align:top;"> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle C=c+n}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>C</mi> <mo>=</mo> <mi>c</mi> <mo>+</mo> <mi>n</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle C=c+n}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/80aec7eff55733378d95dc0fef69918d8ef33cca" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:10.107ex; height:2.343ex;" alt="{\displaystyle C=c+n}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle M=m+n}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>M</mi> <mo>=</mo> <mi>m</mi> <mo>+</mo> <mi>n</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle M=m+n}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1212310607db2b28b198fc41623a6a2980b7d5e4" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:11.816ex; height:2.343ex;" alt="{\displaystyle M=m+n}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle J=j+n}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>J</mi> <mo>=</mo> <mi>j</mi> <mo>+</mo> <mi>n</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle J=j+n}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/5c32f27aa0215d3268e2098624e8250d730c9f1c" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:9.763ex; height:2.509ex;" alt="{\displaystyle J=j+n}"></span></dd></dl> </td> <td style="vertical-align:top;"> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle C=(c\;\times \;(1-n)+n)}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>C</mi> <mo>=</mo> <mo stretchy="false">(</mo> <mi>c</mi> <mspace width="thickmathspace" /> <mo>×</mo> <mspace width="thickmathspace" /> <mo stretchy="false">(</mo> <mn>1</mn> <mo>−</mo> <mi>n</mi> <mo stretchy="false">)</mo> <mo>+</mo> <mi>n</mi> <mo stretchy="false">)</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle C=(c\;\times \;(1-n)+n)}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/6972f1ed13107180a6e12d4569b721b73577ef15" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:23.254ex; height:2.843ex;" alt="{\displaystyle C=(c\;\times \;(1-n)+n)}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle M=(m\;\times \;(1-n)+n)}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>M</mi> <mo>=</mo> <mo stretchy="false">(</mo> <mi>m</mi> <mspace width="thickmathspace" /> <mo>×</mo> <mspace width="thickmathspace" /> <mo stretchy="false">(</mo> <mn>1</mn> <mo>−</mo> <mi>n</mi> <mo stretchy="false">)</mo> <mo>+</mo> <mi>n</mi> <mo stretchy="false">)</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle M=(m\;\times \;(1-n)+n)}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/a411102781dab3c100b108626e30256d9ed5e432" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:24.963ex; height:2.843ex;" alt="{\displaystyle M=(m\;\times \;(1-n)+n)}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle J=(j\;\times \;(1-n)+n)}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>J</mi> <mo>=</mo> <mo stretchy="false">(</mo> <mi>j</mi> <mspace width="thickmathspace" /> <mo>×</mo> <mspace width="thickmathspace" /> <mo stretchy="false">(</mo> <mn>1</mn> <mo>−</mo> <mi>n</mi> <mo stretchy="false">)</mo> <mo>+</mo> <mi>n</mi> <mo stretchy="false">)</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle J=(j\;\times \;(1-n)+n)}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1dc5f9d75a9201679c7a3b654a9d7a32955bad95" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:22.91ex; height:2.843ex;" alt="{\displaystyle J=(j\;\times \;(1-n)+n)}"></span></dd></dl> </td></tr></tbody></table> <div class="mw-heading mw-heading4"><h4 id="Calcul_des_composantes_r,_v,_b_de_l'espace_RVB"><span id="Calcul_des_composantes_r.2C_v.2C_b_de_l.27espace_RVB"></span>Calcul des composantes <i>r</i>, <i>v</i>, <i>b</i> de l'espace RVB</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=14" title="Modifier la section : Calcul des composantes r, v, b de l'espace RVB" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=14" title="Modifier le code source de la section : Calcul des composantes r, v, b de l'espace RVB"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><br /> </p> <table border="1" align="center" cellspacing="0" cellpadding="2" style="border-collapse:collapse"> <tbody><tr> <td align="center" width="300px">Algorithme <abbr class="abbr" title="numéro">n<sup>o</sup></abbr> 1 <br />(proportions calculées sur l'espace total) </td> <td align="center" width="300px">Algorithme <abbr class="abbr" title="numéro">n<sup>o</sup></abbr> 2 <br />(proportions calculées sur l'espace blanc) </td></tr> <tr> <td style="vertical-align:top;"> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle r=1-C}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>r</mi> <mo>=</mo> <mn>1</mn> <mo>−</mo> <mi>C</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle r=1-C}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/971f9bce21f26fb98e215fc8f38733397d202287" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:9.916ex; height:2.343ex;" alt="{\displaystyle r=1-C}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle v=1-M}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>v</mi> <mo>=</mo> <mn>1</mn> <mo>−</mo> <mi>M</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle v=1-M}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/86319361eaf66d21c3b0bf160efb8d9012ee7fb9" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:10.671ex; height:2.343ex;" alt="{\displaystyle v=1-M}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle b=1-J}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>b</mi> <mo>=</mo> <mn>1</mn> <mo>−</mo> <mi>J</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle b=1-J}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/a0c8e8c571307d9264b37efbd7d0f8a37ce5f9ab" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:9.57ex; height:2.343ex;" alt="{\displaystyle b=1-J}"></span></dd></dl> </td> <td> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle r=1-C}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>r</mi> <mo>=</mo> <mn>1</mn> <mo>−</mo> <mi>C</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle r=1-C}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/971f9bce21f26fb98e215fc8f38733397d202287" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:9.916ex; height:2.343ex;" alt="{\displaystyle r=1-C}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle v=1-M}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>v</mi> <mo>=</mo> <mn>1</mn> <mo>−</mo> <mi>M</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle v=1-M}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/86319361eaf66d21c3b0bf160efb8d9012ee7fb9" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:10.671ex; height:2.343ex;" alt="{\displaystyle v=1-M}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle b=1-J}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>b</mi> <mo>=</mo> <mn>1</mn> <mo>−</mo> <mi>J</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle b=1-J}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/a0c8e8c571307d9264b37efbd7d0f8a37ce5f9ab" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:9.57ex; height:2.343ex;" alt="{\displaystyle b=1-J}"></span></dd></dl> </td></tr> <tr> <td colspan="2"><i>Les valeurs résultantes de </i>r<i>, </i>v<i>, </i>b<i> sont dans l'<a href="/wiki/Intervalle_(math%C3%A9matiques)" title="Intervalle (mathématiques)">intervalle</a> [0, 1]. Elles sont ensuite généralement normalisées en entier entre 0 et 255.</i> </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Annexes">Annexes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=15" title="Modifier la section : Annexes" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=15" title="Modifier le code source de la section : Annexes"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Étymologie"><span id=".C3.89tymologie"></span>Étymologie</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=16" title="Modifier la section : Étymologie" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=16" title="Modifier le code source de la section : Étymologie"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Le terme quadrichromie a été construit à la fin du <abbr class="abbr" title="19ᵉ siècle"><span class="romain">XIX</span><sup style="font-size:72%">e</sup></abbr> siècle<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite_crochet">[</span>5<span class="cite_crochet">]</span></a></sup> à partir d'une racine <a href="/wiki/Latin" title="Latin">latine</a>, <span class="lang-la" lang="la"><i>quadri</i></span>, « de quatre » et d'une <a href="/wiki/Grec_ancien" title="Grec ancien">grecque</a>, <i>chromia</i>, couleur. Les fondements techniques avaient été posés au <abbr class="abbr" title="18ᵉ siècle"><span class="romain">XVIII</span><sup style="font-size:72%">e</sup></abbr> siècle par <a href="/wiki/Jacob_Christoph_Le_Blon" title="Jacob Christoph Le Blon">Jacob Christoph Le Blon</a> et ses continuateurs. La presse put imprimer en grand nombre et en couleurs vers 1860<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite_crochet">[</span>6<span class="cite_crochet">]</span></a></sup>. Avant la normalisation des couleurs d'impression vers 1880, on parlait de <a href="/wiki/Chromolithographie" title="Chromolithographie">chromolithographie</a> et de <a href="/wiki/Chromotypographie" title="Chromotypographie">chromotypographie</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Bibliographie">Bibliographie</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=17" title="Modifier la section : Bibliographie" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=17" title="Modifier le code source de la section : Bibliographie"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="ouvrage" id="Gatter2005"><span class="ouvrage" id="Mark_Gatter2005"><abbr class="abbr indicateur-langue" title="Langue : anglais">(en)</abbr> Mark <span class="nom_auteur">Gatter</span>, <cite class="italique" lang="en">Getting it Right in Print : digital pre-press for graphic designers</cite>, Londres, Laurence King Publishing, <time>2005</time>, 172 <abbr class="abbr" title="pages">p.</abbr> <small style="line-height:1em;">(<a href="/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</a> <a href="/wiki/Sp%C3%A9cial:Ouvrages_de_r%C3%A9f%C3%A9rence/978-1-85669-421-6" title="Spécial:Ouvrages de référence/978-1-85669-421-6"><span class="nowrap">978-1-85669-421-6</span></a>, <a rel="nofollow" class="external text" href="https://books.google.com/books?id=Pva2EkbmBYEC&pg=PA31">lire en ligne</a>)</small><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Getting+it+Right+in+Print&rft.place=Londres&rft.pub=Laurence+King+Publishing&rft.stitle=digital+pre-press+for+graphic+designers&rft.aulast=Gatter&rft.aufirst=Mark&rft.date=2005&rft.tpages=172&rft.isbn=978-1-85669-421-6&rfr_id=info%3Asid%2Ffr.wikipedia.org%3AQuadrichromie"></span></span></span></li></ul> <div class="mw-heading mw-heading3"><h3 id="Liens_externes">Liens externes</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=18" title="Modifier la section : Liens externes" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=18" title="Modifier le code source de la section : Liens externes"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><abbr class="abbr indicateur-langue" title="Langue : anglais">(en)</abbr> <a rel="nofollow" class="external text" href="http://developer.gimp.org/faq.html#id2477940"><span class="lang-en" lang="en">GIMP Developer Resources</span> - FAQ 6.2</a></li> <li><abbr class="abbr indicateur-langue" title="Langue : anglais">(en)</abbr> <a rel="nofollow" class="external text" href="http://www.easyrgb.com/index.php?X=MATH#text21">Site EasyRGB, algorithmes de conversion</a></li></ul> <div class="mw-heading mw-heading3"><h3 id="Articles_connexes">Articles connexes</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=19" title="Modifier la section : Articles connexes" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=19" title="Modifier le code source de la section : Articles connexes"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Monochromie : <ul><li><a href="/wiki/Aplat" title="Aplat">Aplat</a></li> <li><a href="/wiki/Monochrome" title="Monochrome">Monochrome</a></li> <li><a href="/wiki/Noir_et_blanc" title="Noir et blanc">Noir et blanc</a></li></ul></li> <li><a href="/wiki/Bichromie" title="Bichromie">Bichromie</a></li> <li><a href="/wiki/Trichromie" title="Trichromie">Trichromie</a></li> <li><a href="/wiki/Hexachromie" title="Hexachromie">Hexachromie</a></li> <li><a href="/wiki/Techniques_de_l%27estampe" title="Techniques de l'estampe">Techniques de l'estampe</a></li> <li><a href="/wiki/Imprimerie" title="Imprimerie">Imprimerie</a></li> <li><a href="/wiki/Photogravure" title="Photogravure">Photogravure</a></li> <li><a href="/wiki/S%C3%A9paration_quadrichromique" title="Séparation quadrichromique">Séparation quadrichromique</a></li> <li><a href="/wiki/Synth%C3%A8se_soustractive" title="Synthèse soustractive">Synthèse soustractive</a> de la couleur</li></ul> <div class="mw-heading mw-heading2"><h2 id="Notes_et_références"><span id="Notes_et_r.C3.A9f.C3.A9rences"></span>Notes et références</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Quadrichromie&veaction=edit&section=20" title="Modifier la section : Notes et références" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Quadrichromie&action=edit&section=20" title="Modifier le code source de la section : Notes et références"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="references-small lower-alpha" style=""><div class="mw-references-wrap"><ol class="references"> <li id="cite_note-2"><span class="mw-cite-backlink noprint"><a href="#cite_ref-2">↑</a> </span><span class="reference-text">Les écrans de télévision et d'ordinateur peuvent représenter environ la moitié des couleurs que la vision humaine peut distinguer.</span> </li> </ol></div> </div> <div class="references-small decimal" style=""><div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink noprint"><a href="#cite_ref-1">↑</a> </span><span class="reference-text"><span class="ouvrage" id="Sève2009"><span class="ouvrage" id="Robert_Sève2009">Robert <span class="nom_auteur">Sève</span>, <cite class="italique">Science de la couleur : Aspects physiques et perceptifs</cite>, Marseille, Chalagam, <time>2009</time>, <abbr class="abbr" title="page">p.</abbr> 199<span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Science+de+la+couleur&rft.place=Marseille&rft.pub=Chalagam&rft.stitle=Aspects+physiques+et+perceptifs&rft.aulast=S%C3%A8ve&rft.aufirst=Robert&rft.date=2009&rft.pages=199&rfr_id=info%3Asid%2Ffr.wikipedia.org%3AQuadrichromie"></span></span></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink noprint"><a href="#cite_ref-3">↑</a> </span><span class="reference-text"><span class="ouvrage" id="Foleyvan_DamFeinerHughes1995"><span class="ouvrage" id="James_D._FoleyAndries_van_DamSteven_K._FeinerJohn_F._Hughes1995"><abbr class="abbr indicateur-langue" title="Langue : anglais">(en)</abbr> James D. <span class="nom_auteur">Foley</span>, Andries <span class="nom_auteur">van Dam</span>, Steven K. <span class="nom_auteur">Feiner</span> et John F. <span class="nom_auteur">Hughes</span>, <cite class="italique" lang="en">Computer graphics : principles and practice in C</cite>, Reading, Addison-Wesley Professional, <time>1995</time>, <abbr class="abbr" title="deuxième">2<sup>e</sup></abbr> <abbr class="abbr" title="édition">éd.</abbr>, 1175 <abbr class="abbr" title="pages">p.</abbr> <small style="line-height:1em;">(<a href="/wiki/International_Standard_Book_Number" title="International Standard Book Number">ISBN</a> <a href="/wiki/Sp%C3%A9cial:Ouvrages_de_r%C3%A9f%C3%A9rence/978-0-201-84840-3" title="Spécial:Ouvrages de référence/978-0-201-84840-3"><span class="nowrap">978-0-201-84840-3</span></a>, <a href="/wiki/Num%C3%A9ro_de_contr%C3%B4le_de_la_Biblioth%C3%A8que_du_Congr%C3%A8s" title="Numéro de contrôle de la Bibliothèque du Congrès">LCCN</a> <span class="plainlinks noarchive nowrap"><a rel="nofollow" class="external text" href="https://lccn.loc.gov/95013631">95013631</a></span>, <a rel="nofollow" class="external text" href="https://books.google.com/books?id=-4ngT05gmAQC&pg=RA2-PA588">lire en ligne</a>)</small>, <abbr class="abbr" title="page">p.</abbr> 588<span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Computer+graphics&rft.place=Reading&rft.pub=Addison-Wesley+Professional&rft.edition=2&rft.stitle=principles+and+practice+in+C&rft.aulast=Foley&rft.aufirst=James+D.&rft.au=van+Dam%2C+Andries&rft.au=Feiner%2C+Steven+K.&rft.au=Hughes%2C+John+F.&rft.date=1995&rft.pages=588&rft.tpages=1175&rft.isbn=978-0-201-84840-3&rfr_id=info%3Asid%2Ffr.wikipedia.org%3AQuadrichromie"></span></span></span>.</span> </li> <li id="cite_note-Poynton-4"><span class="mw-cite-backlink noprint">↑ <sup><a href="#cite_ref-Poynton_4-0">a</a> et <a href="#cite_ref-Poynton_4-1">b</a></sup> </span><span class="reference-text"><span class="ouvrage" id="FordRoberts"><span class="ouvrage" id="Adrian_FordAlan_Roberts"><abbr class="abbr indicateur-langue" title="Langue : anglais">(en)</abbr> Adrian Ford et Alan Roberts, « <a rel="nofollow" class="external text" href="http://www.poynton.com/PDFs/coloureq.pdf"><cite style="font-style:normal;" lang="en">Colour Space Conversions</cite></a> »</span></span>, <abbr class="abbr" title="page">p.</abbr> 14</span> </li> <li id="cite_note-5"><span class="mw-cite-backlink noprint"><a href="#cite_ref-5">↑</a> </span><span class="reference-text"><a href="#Foleyvan_DamFeinerHughes1995">Foley <i><abbr class="abbr" title="et alii (« et d’autres »)" lang="la">et al.</abbr></i> 1995</a>, <abbr class="abbr" title="page(s)">p.</abbr> 589.</span> </li> <li id="cite_note-6"><span class="mw-cite-backlink noprint"><a href="#cite_ref-6">↑</a> </span><span class="reference-text"><span class="ouvrage" id="Gravier1906"><span class="ouvrage" id="Charles_Gravier1906">Charles <span class="nom_auteur">Gravier</span>, « <cite style="font-style:normal">Méthode d'impression en couleurs : la quadrichromie</cite> », <i>Photo-Revue</i>,‎ <time class="nowrap" datetime="1906-07" data-sort-value="1906-07">juillet 1906</time><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=M%C3%A9thode+d%27impression+en+couleurs+%3A+la+quadrichromie&rft.jtitle=Photo-Revue&rft.aulast=Gravier&rft.aufirst=Charles&rft.date=1906-07&rfr_id=info%3Asid%2Ffr.wikipedia.org%3AQuadrichromie"></span></span></span>.</span> </li> <li id="cite_note-7"><span class="mw-cite-backlink noprint"><a href="#cite_ref-7">↑</a> </span><span class="reference-text"><span class="ouvrage" id="1861">« <cite style="font-style:normal">Dessins chromotypographiques</cite> », <i><a href="/wiki/Journal_amusant" title="Journal amusant">Journal amusant</a></i>,‎ <time class="nowrap" datetime="1861-06-15" data-sort-value="1861-06-15">15 juin 1861</time>, <abbr class="abbr" title="page">p.</abbr> 8 <small style="line-height:1em;">(<a rel="nofollow" class="external text" href="https://gallica.bnf.fr/ark:/12148/bpt6k55011582/f8">lire en ligne</a>)</small><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=Dessins+chromotypographiques&rft.jtitle=Journal+amusant&rft.date=1861-06-15&rft.pages=8&rfr_id=info%3Asid%2Ffr.wikipedia.org%3AQuadrichromie"></span></span>.</span> </li> </ol></div> </div> <div class="navbox-container" style="clear:both;"> <table class="navbox collapsible noprint autocollapse" style=""> <tbody><tr><th class="navbox-title" colspan="2" style=""><div style="float:left; width:6em; text-align:left"><div class="noprint plainlinks nowrap tnavbar" style="padding:0; font-size:xx-small; color:var(--color-emphasized, #000000);"><a href="/wiki/Mod%C3%A8le:Palette_Codage_informatique_des_couleurs" title="Modèle:Palette Codage informatique des couleurs"><abbr class="abbr" title="Voir ce modèle.">v</abbr></a> · <a class="external text" href="https://fr.wikipedia.org/w/index.php?title=Mod%C3%A8le:Palette_Codage_informatique_des_couleurs&action=edit"><abbr class="abbr" title="Modifier ce modèle. Merci de prévisualiser avant de sauvegarder.">m</abbr></a></div></div><div style="font-size:110%"><a href="/wiki/Codage_informatique_des_couleurs" title="Codage informatique des couleurs">Codage informatique des couleurs</a></div></th> </tr> <tr> <td class="navbox-list" style="text-align:center;;" colspan="2"><div class="liste-horizontale"> <ul><li><a href="/wiki/Rouge-vert-bleu" title="Rouge-vert-bleu">RVB</a></li> <li><a href="/wiki/RVBA" title="RVBA">RVBA</a></li> <li><a href="/wiki/SRGB" title="SRGB">sRGB</a></li> <li><a href="/wiki/Adobe_RGB" title="Adobe RGB">Adobe RGB</a></li> <li><a class="mw-selflink selflink">CMJN</a></li> <li><a href="/wiki/Teinte_saturation_luminosit%C3%A9" title="Teinte saturation luminosité">TSL</a></li> <li><a href="/wiki/Teinte_Saturation_Valeur" title="Teinte Saturation Valeur">TSV</a></li> <li><a href="/wiki/Profil_ICC" title="Profil ICC">Profil ICC</a></li> <li><a href="/wiki/CIECAM02" title="CIECAM02">CIECAM02</a></li> <li><a href="/wiki/Noms_de_couleur_X11" title="Noms de couleur X11">Noms de couleur X11</a></li> <li><a href="/wiki/Couleur_du_Web" title="Couleur du Web">Couleur du Web</a></li></ul> </div></td> </tr> </tbody></table> <table class="navbox collapsible noprint autocollapse" style=""> <tbody><tr><th class="navbox-title" colspan="2" style=""><div style="float:left; width:6em; text-align:left"><div class="noprint plainlinks nowrap tnavbar" style="padding:0; font-size:xx-small; color:var(--color-emphasized, #000000);"><a href="/wiki/Mod%C3%A8le:Palette_Techniques_d%27impression" title="Modèle:Palette Techniques d'impression"><abbr class="abbr" title="Voir ce modèle.">v</abbr></a> · <a class="external text" href="https://fr.wikipedia.org/w/index.php?title=Mod%C3%A8le:Palette_Techniques_d%27impression&action=edit"><abbr class="abbr" title="Modifier ce modèle. Merci de prévisualiser avant de sauvegarder.">m</abbr></a></div></div><div style="font-size:110%">Techniques d'<a href="/wiki/Imprimerie" title="Imprimerie">impression</a></div></th> </tr> <tr> <td class="navbox-list" style="text-align:center;;" colspan="2"><div class="liste-horizontale"> <ul><li><a href="/wiki/Sceau-cylindre" title="Sceau-cylindre">Sceau-cylindre</a> (4100-500 <abbr class="abbr nowrap" title="avant Jésus-Christ">av. J.-C.</abbr>)</li> <li><a href="/wiki/Impression_au_bloc_de_bois" title="Impression au bloc de bois">Bloc de bois</a> (220 <abbr class="abbr nowrap" title="avant Jésus-Christ">av. J.-C.</abbr>)</li> <li><a href="/wiki/Taille_d%27%C3%A9pargne" title="Taille d'épargne">Taille d'épargne</a></li> <li><a href="/wiki/Typographie_(technique_d%27impression)" title="Typographie (technique d'impression)">Typographie</a> (1040)</li> <li><a href="/wiki/Xylographie" title="Xylographie">Xylographie</a> (Europe, <abbr class="abbr" title="Quinzième">XV<sup>e</sup></abbr>)</li> <li><a href="/wiki/Presse_typographique" title="Presse typographique">Presse typographique</a> (vers 1440)</li> <li><a href="/wiki/Presse_%C3%A0_taille-douce" title="Presse à taille-douce">Presse à taille-douce</a> (<abbr class="abbr" title="Quinzième">XV<sup>e</sup></abbr>)</li> <li><a href="/wiki/Impression_fant%C3%B4me" title="Impression fantôme">Impression fantôme</a> (<abbr class="abbr" title="Quinzième">XV<sup>e</sup></abbr>)</li> <li><a href="/wiki/Lithographie" title="Lithographie">Lithographie</a> (1796)</li> <li><a href="/wiki/Chromolithographie" title="Chromolithographie">Chromolithographie</a> (1837)</li> <li><a href="/wiki/Phototypie" title="Phototypie">Phototypie</a> (1855)</li> <li><a href="/wiki/Photoglyptie" title="Photoglyptie">Photoglyptie</a> (1864)</li> <li><a href="/wiki/Typogravure" title="Typogravure">Typogravure</a> (1876)</li> <li><a href="/wiki/H%C3%A9liogravure" title="Héliogravure">Héliogravure</a> (1878)</li> <li><a href="/wiki/Flexographie" title="Flexographie">Flexographie</a> (années 1890)</li> <li><a href="/wiki/Offset_(imprimerie)" title="Offset (imprimerie)">Impression offset</a> (1903)</li> <li><a class="mw-selflink selflink">Quadrichromie</a> (<abbr class="abbr" title="19ᵉ siècle"><span class="romain">XIX</span><sup style="font-size:72%">e</sup></abbr>-<abbr class="abbr" title="20ᵉ siècle"><span class="romain">XX</span><sup style="font-size:72%">e</sup></abbr> siècle)</li> <li><a href="/wiki/S%C3%A9rigraphie" title="Sérigraphie">Sérigraphie</a> (1907)</li> <li><a href="/wiki/%C3%89lectrophotographie" title="Électrophotographie">Électrophotographie</a> (1935)</li> <li><a href="/wiki/Reprographie" title="Reprographie">Reprographie</a></li> <li><a href="/wiki/Imprimante_%C3%A0_sublimation" title="Imprimante à sublimation">Sublimation</a> (1957)</li> <li><a href="/wiki/Ionographie" title="Ionographie">Ionographie</a></li> <li><a href="/wiki/Tampographie" title="Tampographie">Tampographie</a> (années 1960)</li> <li><a href="/wiki/Imprimante_laser" title="Imprimante laser">Laser</a> (1969)</li> <li><a href="/wiki/Impression_matricielle" class="mw-redirect" title="Impression matricielle">Matricielle</a> (1970)</li> <li><a href="/wiki/Impression_thermique" class="mw-redirect" title="Impression thermique">Thermique</a></li> <li><a href="/wiki/Imprimante_%C3%A0_jet_d%27encre" title="Imprimante à jet d'encre">Jet d’encre</a> (1976)</li> <li><a href="/wiki/Impression_num%C3%A9rique" title="Impression numérique">Numérique</a> (1984)</li> <li><a href="/wiki/Impression_3D" title="Impression 3D">3D</a> (~2000)</li> <li><a href="/wiki/Impression_4D" title="Impression 4D">4D</a> (?)</li></ul> </div></td> </tr> </tbody></table> </div> <ul id="bandeau-portail" class="bandeau-portail"><li><span class="bandeau-portail-element"><span class="bandeau-portail-icone"><span class="noviewer" typeof="mw:File"><a href="/wiki/Portail:Couleurs" title="Portail des couleurs"><img alt="icône décorative" src="//upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Eight-colour-wheel-2D.png/24px-Eight-colour-wheel-2D.png" decoding="async" width="24" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Eight-colour-wheel-2D.png/36px-Eight-colour-wheel-2D.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Eight-colour-wheel-2D.png/48px-Eight-colour-wheel-2D.png 2x" data-file-width="1100" data-file-height="1099" /></a></span></span> <span class="bandeau-portail-texte"><a href="/wiki/Portail:Couleurs" title="Portail:Couleurs">Portail des couleurs</a></span> </span></li> </ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; 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