Why is my PostScript File so Large?

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</nav> </li> </ul> </nav> </div> </div> </div> <div class="md-content" data-md-component="content"> <article class="md-content__inner md-typeset"> <a href="https://github.com/arXiv/arxiv-docs/blob/develop/source/help/faq/psjunk.md" title="Edit this page" class="md-content__button md-icon"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25Z"/></svg> </a> <h1 id="why-is-my-postscript-file-so-large">Why is my PostScript File so Large?</h1> <p>Many current word processors and graphics programs create excessively large PostScript files which include large amounts of "postscript junk".</p> <p>Macintosh and Windows programs seem to have the worst problems. Using programs on one of these platforms, it is all too easy to unknowingly create outrageously huge files. Such files will be much harder for readers to download, and some readers with poor network connections (such as in some developing countries) will not be able to obtain these files at all.</p> <h3 id="what-can-i-do-about-it">What can I do about it?</h3> <p>Authors who are aware of the problem can make an effort to check for "junk" PostScript, and even remove it manually from their files if necessary. The most common sources of unnecessarily large PostScript files are:</p> <ul> <li><a href="#fonts">unnecessary font inclusion</a></li> <li><a href="#previews">unnecessary preview inclusion</a></li> </ul> <p>There are easy ways to avoid these, as described below.</p> <p>See also our <a href="../sizes.html">sizes</a> and <a href="../bitmap/index.html">bitmap</a> help pages.</p> <p><span id="fonts"></span></p> <h2 id="dealing-with-unnecessary-fonts">Dealing with Unnecessary Fonts</h2> <p>The most prevalent cause of huge amounts of junk in PostScript files is the inclusion of font information. For instance, simple figures often have labels or captions. If the font used for this is not in the standard PostScript font families of</p> <blockquote> <p>Helvetica, Times, Courier, and Symbol</p> </blockquote> <p>then the full font definition will be included in the PostScript file. This adds anywhere from 50-200kB per font (in some cases just to print a single letter!!). Some poorly-written software will even include all the standard fonts as well. This is intolerable, since every PostScript interpreter is <em>required</em> to have these four font families built-in already.</p> <p>You can check to see which fonts are included in your file by looking for</p> <pre><code> %%BeginFont </code></pre> <p>or</p> <pre><code> %%BeginResource: font </code></pre> <p>lines (and the corresponding <code>%%End...</code> lines) in your file.</p> <p>If you find non-standard fonts present (i.e., anything outside of Helvetica, Times, Courier, and Symbol), then you should try to find an option in your program to switch them to one of the four standard families.</p> <p>If you find font information for the standard fonts, you can safely slim down your file by removing them. Load the file into a text editor and manually delete the lines from <code>%%BeginFont</code> to <code>%%EndFont</code> (inclusive). After making any modifications you will want to check that your file still prints and views correctly, just in case any accidents occurred while editing the file.</p> <p><span id="previews"></span></p> <h2 id="dealing-with-unnecessary-previews">Dealing with unnecessary Previews</h2> <p>Some applications, particularly on Macs and PCs, include a large uncompressed "preview" bitmap in every postscript file. This is supposed to allow a very crude approximation of the PostScript file to be rendered on screen when viewed in a non-PostScript viewer. This preview is low quality, and is superfluous for figures submitted to arXiv in any case.</p> <p>Previews are easy to find and eliminate. Submitters should look for any:</p> <pre><code> %%BeginPreview </code></pre> <p>lines followed by hexadecimal data (e.g., <code>092f62696e2f...</code>), and ending with:</p> <pre><code> %%EndPreview </code></pre> <p>Remove all the hexadecimal data and the <code>%%BeginPreview</code> and <code>%%EndPreview</code> lines to eliminate the preview completely.</p> <p>Note that the savings can be considerable. One example had two figures with preview bitmaps. One started as a 482kB file and slimmed to 154kB, the other was reduced from 550kB to 146kB! 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