Next to robotics, I enjoy photography and that includes developing pictures. A few weekends back got #digiKam and #Rawtherapee color managed using #DisplayCAL I thought some of you would be interested, so wrote down the steps at https://arnebaeyens.com/blog/2026/linux-display-calibration/
Arne Baeyens' website | Let your pictures show their true colors in Linux

A tale of ICC profiles, DisplayCAL, gamut mapping and VCGTs

Arne Baeyens' website
What's still *not* working perfectly is multimonitor handling (with a different ICC profile for each monitor). #Rawtherapee kind of handles that by offering an always-visible ICC profile select field. Other applications, like #digiKam, #nomacs and #Gwenview, are color managed but (at least on Ubuntu 24 with X11) either (1) always use the primary display's ICC profile or (2) require diving in the menus to set it.
At this point, I'm wondering how to proceed.
• Switch to KDE or Wayland, where multimonitor is handled? (Is it?)
• Use another image viewer?
• Patch nomacs or gwenview to expose the ICC profile setting (like Rawtherapee does)?
• ... ?