I would do something like this:
Overlay(cgiclip,nocgiclip,mode="difference",opacity=1)
This isn't exactly what you are looking for but any pixels that don't match each other will immediately jump out at you while you are watching.
I would do something like this:
Overlay(cgiclip,nocgiclip,mode="difference",opacity=1)
This isn't exactly what you are looking for but any pixels that don't match each other will immediately jump out at you while you are watching.