Sometimes I need to flip from a light colour scheme to a dark one quickly, and I need it to apply not just to the desktop theme but also to any webpages that are open etc.
On the Mac there's a neat shortcut for this (Cmd+Alt+Ctrl+8) - it simply inverts all colours displayed, so the screen looks like a photographic negative.
Is there an equivalent of this that I can use in my debian/ubuntu desktop sessions?
A window manager independent way is:
xcalib -invert -alter
From the xcalib man page
xcalib loads 'vcgt'-tag of ICC profiles to the X-server using the XVidMode Extension in order to calibrate your display.
You can install it using sudo apt-get install xcalib. To make it more convenient assign a keyboard shortcut to the command (e.g. Cmd+Alt+Ctrl+8).
The following works on Pop-OS 21, which is an Ubuntu variant.
Settings > Accessibility > Zoom > Magnifier > Full Screen
Settings > Accessibility > Zoom > Color Effects > White on Black
Alt-Super-8
If you have Compiz, open CompizConfig Settings Manager and enable Negative. This will allow you to invert colors of a window (default shortcut is Super+n) or the whole desktop (default shortcut is Super+m).
