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Tool for comparing two images?

What is a good software that lets me compare two .bmp files on Unix?

I am generating .bmp's with very minute changes and need a way to "see" where the changes went.

Anything that can tell me which pixels are different would be good enough.

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Please clarify your question. Comparing two images is not an easy nor a trivial task, what should the program look for? What should it output? What do you consider a difference in the bitmaps? – Bobby Mar 17 '10 at 8:24
@Bobby: edited! – Lazer Mar 17 '10 at 17:17
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you asked that already in superuser.com/questions/46760 – akira Mar 18 '10 at 7:39
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@eSKay: you should specify that in the question; it's not clear what kind of output you're looking for, and you're collecting answers that duplicate those on your earlier question. please clarify your question to indicate what you need here that those tools don't provide. – quack quixote Mar 18 '10 at 9:01
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my answer would still be the same: pdiff.sourceforge.net – akira Mar 18 '10 at 9:38
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closed as exact duplicate by random♦, fretje, Ivo Flipse♦ Mar 18 '10 at 10:48

This question covers exactly the same ground as earlier questions on this topic; its answers may be merged with another identical question. See the FAQ.

3 Answers

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ImageMagick has a simple comparison tool.

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Although not free, Beyond Compare is a great tool for comparing just about anything. It has a very nice image comparison which will show you visually which pixels changed in an image.

Beyond Compare - Image comparison

Both Windows and Linux platforms are available. They have a trial period which you can use to try it out before the purchasing for $30 .

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