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Reinstate color management for the main viewport
I wanted to do this before proceeding with paint tools, because I need to know what kind of delay is induced by problematic ICC profiles (like those generated by the stupid Windows "calibrate your monitor without using professional tools!" Control Panel applet). Maximum delay across my set of test profiles is ~15-25 ms, with professionally constructed profiles coming in closer to ~10 ms. This is an excellent result, and significantly better than the old Windows ICM engine (which frequently hit delays over 100 ms, especially on profiles constructed by Windows). Note that users who don't want a color-managed display can now deactivate the engine entirely from the Tools > Options dialog. This will provide a performance boost, and if your display is close to sRGB anyway, it might be worth it. Next up is restoring color management to elements like the image tabstrip and the color selection tools. Thank you also to Roy K and ChenLin for contributing updated translation files to this patch.
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That's very handy being able to disable the colour-management engine entirely as for web-work you're better off stripping all colour management entirely to avoid mismatching of CSS & PNG colours. Will the option be available in the menu, as it's something I'd want to toggle regularly?
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Yes. Once soft-proofing is implemented, the View menu will receive new options to match, including quick links for common display modes (including an unmanaged display).
That said, when doing webwork you definitely want your display to still be color-managed. Display color management is a non-destructive setting that simply compensates for any weaknesses in your display hardware. (For example, if you're doing webwork on a crappy old netbook screen, a proper color-managed display will over-saturate the colors to compensate for the weak screen, so you get an experience closer to high-end display.) It has zero bearing on the underlying image colors.
What you don't want for web work is a working space other than sRGB. At present, PD is hard-coded to use sRGB as its working space. This will be changing in the coming weeks, but sRGB will always be the program's default as it's by far the best setting for casual users.