[no subject]

I've seen this done in big bloated security applications, but I'm 
looking for a simple command line utility or method of doing something 
like this:

if (image1.png) is more than n percent different from (image2.png), exit 
with a true; if not, exit with a false

Heck, I don't even need to have an adjustable threshold; I just need to 
know if 2 images are significantly different.  Does anyone have any 
ideas on how I could accomplish this?

Thanks in advance!
-CB


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