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Is there some unix command line tool which can find similar images and output them as groups for further processing?

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The definition of "similar" varies among people. A few "mostly red" images are similar, images which contain my face are similar, images which differ only in being resized are similar, a small image which was cut out of a large image would be similar, an image which was converted from .png to .jpeg might be similar, etc. It'd probably help to better define "similar". :) – dannysauer Nov 12 '10 at 0:40
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findimagedupes is a pretty creaky, old perl program, but you can still find it about and it works pretty well.

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Found pHash library. Though it is not a tool, its a library, but it is easy to integrate it and use.

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