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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?

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What Desktop Environment/Window manager do you use? Gnome? Unity? Cinnamon? –  terdon Mar 24 '13 at 10:45
    
Thanks for the nudge - I'm using LXDE/Openbox, but I realise I was assuming the effect would happen lower down (in Xorg) - and there is an answer that does do this, hurrah. –  Dan S Mar 24 '13 at 22:07

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up vote 5 down vote accepted

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).

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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).

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