Created attachment 1230878 [details] firefox 50 screen shot with darkly rendered images Description of problem: Some JPEG images are rendered dark in Firefox 50. See screenshot attachment. Version-Release number of selected component (if applicable): $ rpm -qa firefox firefox-50.0.2-1.fc24.x86_64 How reproducible: Always Steps to Reproduce: 1. Visit http://arstechnica.com/gaming/2016/12/one-upping-the-nes-classic-edition-with-the-raspberry-pi-3-and-retropie/ Actual results: Some images in linked article are dark. Expected results: Images should be rendered with proper contrast and/or brightness. Additional info: * Creating a fresh profile does not change the problem (extensions not at fault). * Mozilla's build of FF 50.0.2 DOES NOT exhibit this problem (available @ https://archive.mozilla.org/pub/firefox/releases/50.0.2/linux-x86_64-EME-free/en-GB/firefox-50.0.2.tar.bz2)
firefox-50.1.0-1.fc24.x86_64
firefox-51.0.1-2.fc24.x86_64 affected.
Thanks for the report. It's related to color management. To workaround this change gfx.color_management.enablev4 to false in about:config. or you could check the color profile for your monitor in Gnome Settings/Color. Disabling color profile also helps to me, but that's most likely unwanted 'solution'.
Looks like this problem is tracked upstream: https://bugzilla.mozilla.org/show_bug.cgi?id=512705 BTW upstream binaries has the gfx.color_management.enablev4 set to false by default, that's why is it okay in it. If you change it to true you'll encounter same problem as our build.
For the reference, it was enabled by fixing bug 878831.
Richard, do you think we can do something about that? Do you have any clue what's wrong here? Do the image looks good for you?
I do see the problem on Fedora's Firefox. I don't see the problem using the org.mozilla.FirefoxDevEdition/x86_64/master org.mozilla.FirefoxDevEdition-origin flatpak. Of course these have gfx.color_management.enablev4 true and false respectively. I also don't see the problem in GIMP. The short term solution is what I recommend in bug 1399806.
I guess we'll disable color management for Firefox until it is fixed.
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