Uplift from http://tenfourfox.tenderapp.com/discussions/problems/394-color-profiling-not-working

We might need to instrument the code in https://bugzilla.mozilla.org/show_bug.cgi?id=514932 or roll it back.

In gfx/thebes/gfxPlatform.cpp, we try sRGB first (if gfx.color_management.force_srgb is true), then try to load any specified profile, then try to load the platform profile. If the platform profile is bogus, assume sRGB. We should be able to see by enabling DEBUG_tor in gfxPlatformMac::GetPlatformCMSOutputProfile() whether it actually can load it.

We should also make sure that the gamma seen by qcms is, indeed, 1.8.

Image from reporter (NSFW): http://photos.modelmayhem.com/photos/090416/11/49e77a949088d.jpg

Adding some instrumentation, the Huey profile on the G5 appears to load:

CMGetProfileByAVID NCMGetProfileLocation NCMGetProfileLocation ok ICM profile read from /home/spectre/Library/ColorSync/Profiles/huey Unnamed Mo fileLoc successfully

The Huey profile doesn't have a gamma value; it has direct colour sampling. The Generic RGB Profile does have a gamma of 1.8.

Setting gfx.color_management.enablev4 to true fixes the problem (Preview and TenFourFox are identical for the huey profile).

With this enabled for Generic RGB, the image is better, though does not quite match Preview.

Adam, when you look at this bug, please report in whether toggling that setting has an effect for you.

There is a bug with enabling V4 profiles (M722831). This bug did not land on ESR, so ESR will need that also:

https://hg.mozilla.org/releases/mozilla-beta/rev/4cee1607a72e

Also, https://bugzilla.mozilla.org/show_bug.cgi?id=739785

Pref toggled in 22.

The test image from Tender is displayed correctly in TFF 21 if gfx.color_management.enablev4 is set to true. I see you already discovered it yourself, this is just to confirm it also works on 10.5. Also color.org/version4html.xalter renders with four correct quadrants.

Excellent. Scheduled for 17.0.7/22 then.

Both changes checked into 17.0.7

Checked into 22.0