2014-04-26 10:52:28 -04:00
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vdiff
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2014-04-26 11:54:15 -04:00
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/veedif/ , v.,n. Visual diff. The operation of finding differences between
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two files by eyeball search. The term optical diff has also been reported,
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and is sometimes more specifically used for the act of superimposing two
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nearly identical printouts on one another and holding them up to a light to
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spot 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 claim few if
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any diff programs can make. See diff. An interesting variant of the vdiff
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technique usable by anyone who has sufficient control over the parallax of
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their eyeballs (e.g. those who can easily view random-dot stereograms), is
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to hold up two paper printouts and go cross-eyed to superimpose them. This
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invokes deep, fast, built-in image comparison wetware (the same machinery
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responsible for depth perception) and differences stand out almost
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immediately. This technique is good for finding edits in graphical images,
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or for comparing an image with a compressed version to spot artifacts.
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