diff command for images

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diff command for images
\ Erik (27 Jan 2008)
. \ Elias Probst (27 Jan 2008)
. . \ Erik (27 Jan 2008)
. \ Jens Krahe (27 Jan 2008)
. \ Willie Wong (27 Jan 2008)
. \ Ralf Stephan (27 Jan 2008)

8 msg	(no subject)

Subject:	diff command for images
Group:	Gentoo-user
From:	Erik
Date:	27 Jan 2008

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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