How to compare 2 images from command line

Hi everyone,

I'm trying to determine if 2 jpeg images are identical. The images are screenshots taken with scrot at different times. The point is to know if the display is working correctly. I tried to use 'diff' but without success, probably because of the metadata included in the image. I also tried the 'compare' command from imagemagick, but it produce an image containing the difference between the 2 images instead of telling me if both images are identical.

So, my question is what are you using to determine if 2 images are identical?

I'm using FreeBSD 7.0 and I need to be able to script this comparaison for an integration in Nagios.

Thank you,

Martin
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