[gentoo-user] diff command for images

[Erik]

I need to find the difference between images (like the text-file diff
command, but for RGBA images). I tried "compare A.png A.png
difference.png". This should obviously produce some kind of blank image
because A.png and A.png are the same file, but for some weird reason the
produced difference.png has recognizable content! Is there a fix for
that bug or any other image diff program that is sane?
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