I am using 2 screens, and wish to invert the colors on both of them without using compiz (I'm using gnome shell).
I can use
xcalib -invert -alter as suggested in this question, but it only inverts one of the screens. Is there a way to specify both of them, or even which of them, using
xcalib? Is there another way?
xcalib, you can specify which screen to alter with the
-screen) options, but alas,
X seems to be aware of just one screen: when I use the
w command I only see one (the usual ":0")