I'm trying to find any kind of software that allows you to change the tint of your screen. I've seen redshift and f.lux, but they're not exactly what I'm looking for - both of them shift with the time of day and only offer a red colouration, whereas I'm looking for something that holds the colour permanently and which has a wide variety of colours.
A Windows example of what I'm looking for is ScreenRuler, from the ClaroRead software bundle.
Is there anything like that that exists for linux?
