There are two sources for the profile: colord and the X atom. darktable-cmstest says they are set to the same value on my machine (using KDE).
Now, just to be sure, I actually run the following as part of the script that launches darktable – there were times when it was needed to help the atom and colord report the same value:
Maybe try something like that, and see if it helps. Sorry if you already tried that and I missed that part, I have been a bit busy and was not able to follow the thread.
Ok it’s a while ago that I tested gnome color management, will have another look at it. But problems with gnome color management quite regularly pop up here. And you might not notice the problem if you have a “normal” srgb screen.
If it was fixed, maybe I’ll even use gnome…
Quite possibly, because I have been using Gnome with zero issues since 2020. Only now, in the last few days since it updated to 44, ia when I started having troubles.
HOWEVER, why then, does not RT, when specifically instructed to use the system’s main colour profile, show the same image GIMP (or Firefox, or gthumb, or Gwenview) does when instructed to use the system’s main colour profile?
The only way I am able to make it do this if I enable soft-proofing, which, if I understand correctly, simply simulates what the image looks like on a system that uses said colour profile, but I already chose that behaviour when I told it in the preferences to use the system’s main profile.
I don’t think you’ve given us enough information to adequately answer that question, hence the lack of answers.
You’d need to detail all the ICC profiles in your workflow for each application. If they’re all 100% the same and you load the same tiff into both RT and GIMP, then they should display the same.
There are no “all profiles”. I use a single .icc profile in my workflow. I install it as a system profile and just enable “use main system profile” in all apps.
But… In RT I load a raw and in GIMP I load the tiff RT exports… Shouldn’t they still display the same? They used to, for the longest time…
You misunderstood, likely due to bad wording on my side.
My working profile is ProPhoto, display is the calibrated system profile from DisplayCal, output is sRGB and input… I’m not sure and I’m not at the computer right now.
What you see in RT is input → working → display profile.
What you see in GIMP is (input → working → export) → display.
Depending on the gamut of the export profile (e.g. much smaller than display one) and the mapping done by the CMS (perceptual, relative, etc.), you can get different looking images.
