Where is the application to reverse the color of the screen?

Solution 1:

Compiz method

Its a Compiz plugin, Firstly install ccsm if you havent already

sudo aptitude install compizconfig-settings-manager

Then go to

System > Preferences > CompizConfig Settings Manager

Tick the plugin Negative. If it is not listed, then install the compiz-plugins package, and reopen CCSM:

sudo apt-get install compiz-plugins

Now it should work But in Natty, You will face a problem, Pressing Ctrl+M Brings up the messaging menu So the key association of the Negative Plugin should be reassigned to another combination

To do that: Click the Name of the negative plugin You should encounter such a page Click the key combinations and change them to something else Now it will work

Non Compiz method

Either you can use

magnifier -z 1 -fi 

or
sudo apt-get install xcalib
/usr/bin/xcalib -invert -alter;