17 lines
2.8 KiB
HTML
17 lines
2.8 KiB
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<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>vdiff</title><link rel="stylesheet" href="../../jargon.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.61.0"/><link rel="home" href="../index.html" title="The Jargon File"/><link rel="up" href="../V.html" title="V"/><link rel="previous" href="vaxocentrism.html" title="vaxocentrism"/><link rel="next" href="veeblefester.html" title="veeblefester"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">vdiff</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="vaxocentrism.html">Prev</a><EFBFBD></td><th width="60%" align="center">V</th><td width="20%" align="right"><EFBFBD><a accesskey="n" href="veeblefester.html">Next</a></td></tr></table><hr/></div><dt><a id="vdiff"/><dt xmlns="" id="vdiff"><b>vdiff</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="pronunciation">/vee<65>dif/</span>, <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">v.,n.</span></dt></dt><dd><p> Visual diff. The operation of finding differences between two files
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by <a href="../E/eyeball-search.html"><i class="glossterm">eyeball search</i></a>. The term <span class="firstterm">optical diff</span> has also been reported, and is
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sometimes more specifically used for the act of superimposing two nearly
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identical printouts on one another and holding them up to a light to spot
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differences. Though this method is poor for detecting omissions in the
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‘rear’ file, it can also be used with printouts of graphics, a
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claim few if any diff programs can make. See
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<a href="../D/diff.html"><i class="glossterm">diff</i></a>.</p><p>An interesting variant of the vdiff technique usable by anyone who
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has sufficient control over the parallax of their eyeballs (e.g. those who
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can easily view random-dot stereograms), is to hold up two paper printouts
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and go cross-eyed to superimpose them. This invokes deep, fast, built-in
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image comparison wetware (the same machinery responsible for depth
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perception) and differences stand out almost immediately. This technique
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is good for finding edits in graphical images, or for comparing an image
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with a compressed version to spot artifacts.</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="vaxocentrism.html">Prev</a><EFBFBD></td><td width="20%" align="center"><a accesskey="u" href="../V.html">Up</a></td><td width="40%" align="right"><EFBFBD><a accesskey="n" href="veeblefester.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">vaxocentrism<EFBFBD></td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"><EFBFBD>veeblefester</td></tr></table></div></body></html>
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