Is there any software that would let me diff entire folders of similar images .For eg folder A would have img1,img2,img3 ....... folder B would have img1,img2,img3 ....I want this output in another folder with just the diff images in there .

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Image comparison is potentially a fairly broad area. Are you looking for exact or approximate matches? Should the filetypes be the same or are you just looking at pixel data? Do the matches need to be scale and rotation invariant? Or is it enough that the image files have the same checksum? – Andrew Walker Dec 21 '11 at 0:17
I am just looking for a difference in pixels.The corresponding images are largely expected to be the same. – Manish Dec 21 '11 at 0:51
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Check http://kaleidoscopeapp.com... perhaps through Terminal it would allow you batch processing.

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