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+install ImageMagick (yum install ImageMagick), then something like this:
+
+$ compare aaa.png bbb.png -highlight-color violet \
+ -lowlight-color darkgray -compose threshold jpg:- \
+ | convert jpg:- -fuzz 2% -fill red -opaque '#915e99' \
+ png:cmp-aaa-bbb.png
+
+will generate cmp-aaa-bbb.png effectively diffing bbb.png against aaa.png