As far as I can see, in Linux there is only one simple (graphical) color management/profile loading tool which works really well: the Gnome color manager (which also works with other desktop environments such as Cinnamon or Budgie). Other reliable options might also be various command line tools (which I am not really an expert of).
Unfortunately, color management with gui-tools does not really work well with XFCE and KDE: The Displaycal profile loader regularly forgets the profile which was installed/selected after a while, and kde-colord cannot interpret or choose profiles correctly (oversaturation, I think in my case, it always used the profile for the laptop display, even though the right profile was selected for the external display and/or applied the profiles twice; so there is probably a reason why the tool is not installed with the desktop environment by default).
I think it is really a pity that there is no integrated color management in XFCE. That’s why I have been wondering how command line tools work. I have been googling a lot but I think I am still too confused.
Am I seeing things right?
Thanks in advance for the answers