I would like to change chromium's ImageDiff to reflect the magnitude of
pixel changes. Currently, if the pixel has any difference, the entire pixel
is marked as 100% red. I'd like to change it so that miniscule difference
are 20% red and large differences are 100% red. Looking at the code for CG,
gtk and Win versions of ImageDiff, I think they already do something
similar. Is this correct?

Would anyone be opposed to such a change? See the attached image for an
example of how this could assist in debugging regressions. It would
certainly be enormously useful in my color management efforts.


The CL in question is https://bugs.webkit.org/show_bug.cgi?id=89253

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