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I have two images that are slightly different. (The second is actually generated by some manipulation in MatLab).

I need some way to compare these two images.Some utility that can highlight where the differences are.

[I know this can be done in Matlab, but I don't want to do it that way. Some easier method... some app maybe?]

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Too old. But this should be on Software Recommendations – Lưu Vĩnh Phúc Jun 29 at 12:22
@LưuVĩnhPhúc – if it was asked today... But this question was asked about 5 years before Software Recommendations was established. – miroxlav Jun 29 at 20:57

6 Answers 6

up vote 11 down vote accepted

Beyond Compare is really a file-and-folder comparison tool, but it also contains image comparisons (example link).

There's a free trial. I bought this tool ($30) because it's so incredibly useful for many things.

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Beyond Compare really does live up to its name. It is the greatest comparison tool on the planet. – raven Sep 25 '09 at 13:33

I use AKS

It allows you to compare two JPG files and show differences between them. For instance, this tool allows you to compare two versions of the same image, chart, diagram or scheme.

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There's the Araxis tools. From the screen shots on the page it appears that it highlights differences too.

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Okay this is going to sound ridiculous, but if they are the same size you can put them side by side and cross your eyes like you would for a magic eye 3D picture, and the differences will stand out as if they are flickering (as your brain quickly alternates between the two different overlapped picture elements)

I use this "cheat" when I play those spot-the-difference flash games :P

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:) actually my images are very high resolution with just one or two pixels difference between them (thats right - just some pixels) – Lazer Sep 25 '09 at 17:38
magic eye 3d ftw! – warren Sep 27 '09 at 10:27

perceptual diff:

PerceptualDiff is an image comparison utility that 
makes use of a computational model of the human visual 
system to compare two images.
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Eh, I just tried it on two PNGs, both being solid white, 300x200 in size, one was straight from photoshop, the other was compressed with imageptim (lossless image compression tool) and it said 60,000 pixels were different, turns out, there's 60,000 pixels in a 300x200 image... – MarcusJ Jul 27 '14 at 6:09
provide both pictures and i might tell you more. – akira Jul 28 '14 at 7:11

I've just found this user-friendly app, DiffImg

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