Images with orientation are not handled correctly with the changes above.
For example, load http://fredericiana.com/media/2013/monalisa.jpg and resize to see odd effects with light box being off-center ... example attached.
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Screen Shot 2017-11-06 at 1.24.59 PM.png
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The background is supposed to be sRGB 0.05,0.05,0.05
There shouldn't be a lightbox -- the black there should should match the background (they go through different paths) -- it's "acceptable" for the color values to be off by 1/255, but that seems like quite a bit. Could you upload that monitor's color profile.
According to System Preferences -> Displays, the screen I recorded on is using the ./System/Library/ColorSync/Profiles/DCI(P3) RGB.icc profile. FWIW, I see the same issue if I use the ./System/Library/ColorSync/Profiles/AdobeRGB1998.icc profile.
Using dev-tools show "Layer borders" feature, I notice the "off-center light box" is exactly correlated with compositing tile boundaries.
Comment 1 by dfalcant...@chromium.org
, Sep 27 2016