Review Request 123928: Apply display color profile to all images

[Jan Kundrát]

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https://git.reviewboard.kde.org/r/123928/
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Review request for Gwenview, Albert Astals Cid and Aurélien Gâteau.


Repository: gwenview


Description
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...including those which do not have any embedded profile. Just treat
them as sRGB, which is probably a reasonable choice. This makes a huge
difference on wide-gamut displays.

LittleCMS doesn't support RGBA_Premultiplied because premultipled alpha
doesn't "make a lot of sense with a color management system since color
perception varies with intensity and the colorspace may not be linear
across the color channels" (see [1] for why, and for an experimental
patch which apparently didn't move anywhere and wasn't merged).

[1] http://sourceforge.net/p/lcms/mailman/message/30246542/


Diffs
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  lib/cms/cmsprofile.h 014654ccf8592d0cfd6fae3e5186679c47a2e207 
  lib/cms/cmsprofile.cpp 2e67e04b0532d37f3697458ffd87268474819a9a 
  lib/documentview/rasterimageview.cpp 793e1aa86e46e77ef7a551b81af162029fadd60d 
  lib/imagescaler.cpp a3597dbe47e454a73548e545d7edcfee64912904 

Diff: https://git.reviewboard.kde.org/r/123928/diff/


Testing
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On my DELL U3014, this makes gwenview usable once again. You do not want to see the pink tones here without this patch.


Thanks,

Jan Kundrát

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