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tools for computing the differences of two images

I would like to ask for tools that can compute the differences of two images. Better to be open source. Thanks very much! Hope it is not difficult question.
1 Solution
You can use the difference blending mode of graphics applications to get what you're asking.  Photoshop has it, but isn't opensource... however The GIMP is - you can get it from www.gimp.org
You might also find this document about GIMP's blending modes usefull: http://gimp-savvy.com/BOOK/index.html?node55.html
Check out ImageMagick. It's a most powerfull commandline tool with many, many options. One is the -compose which lets you calculate the difference (among other operations) between two images.

Details about options can be found at: http://www.imagemagick.org/www/ImageMagick.html
Some examples: http://www.imagemagick.org/www/ImageMagick.html

Another more advanced toolkit is Xite (http://www.ifi.uio.no/forskning/grupper/dsb/Software/Xite/WHAT_IS_XITE.html). Use for example the tiff2biff command to get your image in the Xite BIFF format. Then use the absdiff (Absolute difference), signdiff or the divide. Why not take a standardized difference (A - B/A + B). Finally use the histogram equalize or normalize function to get an appropriate output for viewing.
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