On Wed, 29 Apr 2026 11:49:53 +0000 Andrea paz via Cin <cin@lists.cinelerra-gg.org> wrote:
I only use non-sRGB mode, since I use a wide-gamut ICC profile created with the Spider 5. Right now, it doesn't work in any color manager—neither in colord (X11, KDE) nor in “Settings → Display” (Wayland, KDE). My ICC profile displays incorrect colors: AdobeRGB; sRGB; Rec.709; DCI-P3. The monitor displays very dark, almost black screens. I don’t know why; the only combination that works for me is using the custom profile but without my ICC—it automatically uses the monitor’s default profile (Dell UP2716D).
Hi Andrea, FWIW, the measurements for a new display profile must be made in the exact same video mode (including possible gamut and HDR metadata in the signal) as the display will be driven while using the profile. If anything changes in the signalling or calibration (e.g. changing settings in the monitor itself), a new profile must be made. Because of this, a profile made under one system (Xorg, Plasma Wayland, GNOME Wayland, ...) may not be right under another system for the very same monitor. Color management on X11 vs. Wayland works fundamentally differently: https://gitlab.freedesktop.org/pq/color-and-hdr/-/blob/main/doc/winsys_color... On X11, every app needs to use the monitor profile itself. They may fetch that profile automatically from colord, but colord itself does no color management. On Wayland, the display system (the compositor) implements color management and uses the monitor profile. App windows are assumed to be sRGB unless the app explicitly says otherwise through the Wayland protocol. X11 apps through Xwayland are a good question - there is no way that an X11 app could say it is producing something other than sRGB. If you configure the monitor profile to X11 apps, the result will likely be wrong, because the Wayland compositor still assumes that the X11 app produces sRGB and does the color conversion again. There could be desktop environment specific overrides to work around this so that X11 apps could employ larger than sRGB color gamut for display, but I'm not aware of any. I have hopes to improve the situation. On a Wayland compositor, doing the measurements is tricky if the compositor or desktop environment does not explicitly support profiling. Here is an old post about Plasma Wayland: https://zamundaaa.github.io/wayland/2024/07/16/how-to-profile.html I don't know if things have changed in Plasma since. My plan for supporting profiling is at: https://gitlab.freedesktop.org/pq/color-and-hdr/-/work_items/27 I hope this explains the messy situation at least a little bit. Thanks, pq