Android offers a grayscaled or monochromatic mode to save battery on phones with an AMOLED display. This could be interesting Plasma-Mobile users -- should it ever become widespread. LineageOS sells this mode to you as lowering the eye stress when marathon reading.
https://store.kde.org/p/1263836/
Did comment 1 help to resolve this issue?
(In reply to Christoph Feck from comment #2) > Did comment 1 help to resolve this issue? Sorry I haven't had the time to test it and I forgot about this issue. If this applet works, I guess it's good enough. ;) Thanks.