This is basically to transform the screen (of a laptop), into a black and white screen. I am using Ubuntu 13.04.
On Ubuntu, some people have had luck doing this using
Alternatively, you could do the same by adding the following lines in your Xorg configuration:
Keep in mind that Xorg may not start with this configuration if your display drivers do not support such a low color depth value.
On my system (ThinkPad T61 Nvidia Quadro NVS 140M), when using proprietary Nvidia driver, to transform to greyscale I use following command:
To return to color I use:
I assigned this instructions to key combinations, so I can change my display to grayscale and color more easly.
I hope this will be some kind of inspiration to someone.