I would like to have a plugin? feature? that would turn the while screen in monochromatic red like Stellarium does for night mode: https://lcom.static.linuxfound.org/images/stories/figure-3-stellarium.png The idea is that red light does not interfere so much with night vision, which is good for looking at starry nights (specially when using the computer to drive nice time lapses or long exposures :) This is NOT dark mode (https://store.kde.org/p/1013059).
I guess what I want is a desktop effect than can do it.
See the nightmode setting for gamma ramps. Anything else is out of scope.