I should add that I'm also fine with some workarounds. I tried to make a service that would capture the screen, desaturate it, and then show that desaturated v

I should add that I'm also fine with some workarounds. I tried to make a service that would capture the screen, desaturate it, and then show that desaturated version on the screen (like a sort of, full screen video, with a tap-through to the underlying android system) but that doesn't work.