https://bugs.kde.org/show_bug.cgi?id=367832
--- Comment #25 from Tyson Tan <tyson...@mail.com> --- Created attachment 100881 --> https://bugs.kde.org/attachment.cgi?id=100881&action=edit Windows driver with embeded ICM profile Some additional information: On Windows, I highly suspect we need to install a proper driver for the monitor in order to reproduce color difference. In this screenshot, the "Generic PNP Monitor" is actually a Cintiq 13HD. There is no ICM profile associated with this Windows default driver. If this is what your monitor looks like in Windows Device Manager, color management is most likely being turned off. That’s probably why you don't observe color difference in Firefox. Since Windows XP, Windows began to automatically pull drivers from Windows Update. Windows 10 has a very large online driver library that it can solve most driver problem by itself. That service brought about new problems -- I didn’t install NEC PA242W’s driver in that screenshot. Windows 10 did it. PA242W’s driver has an ICM profile. So far as I know, every specific monitor driver provided by the manufacturers has an ICM profile. All these ICM profiles share a similar characteristic: that funny blue response curve in TRC view that greatly deviates from the center. If you are running Thinkpad X/T/W/P laptops, Lenovo provides laptop screen drivers on their website (some only shown when you select Windows 7). When I was using Thinkpad X201T/X230T, I once installed the monitor driver and the color shift happened right after that. Same thing happened for all my DELL monitors and even a cheap crap like Philips 190EL...yeah they even bothered to provide a driver. Probably an industrial standard or something. I never encountered this problem soon after I migrated to Linux and started color managing my monitors. That’s why I have completely forgotten this problem until it surfaced again when I was using my totally unmaintained Windows 10 to test Krita there. My suggestion on environment to reproduce this problem: On GNU/Linux: Ubuntu Original / Ubuntu Gnome. Do not associate calibrated profile. Use Firefox. The key here is probably a DE with Color management capability which is being turned ON, with no calibrated profile loaded for the monitor. Gnome and Unity are very typical for this (Unity uses Gnome control schemes). They all have CMS capability, they all turn CMS on by default, they all auto-generate ICC profiles and associate them with the monitors, triggering Firefox to do color management (in a wrong way). On Windows: Install a driver from your monitor’s manufacturer, do not associate calibrated profile. Use Firefox. -- You are receiving this mail because: You are watching all bug changes.
