I would much rather this sort of thing be handled by the OS along with other accessibility features. One option would be to have the OS add a pattern to the re

I would much rather this sort of thing be handled by the OS along with other accessibility features. One option would be to have the OS add a pattern to the red component of the RGB space. That would work for sufficiently large patches. Another idea would be to add a time domain function to red that pulsates the brightness. With options for always on or momentary.