How to change display to black and white on demand?

[Dotan Cohen]

Is there any way to change the display to black and white on the fly?
I use Kubuntu 11.10 with xorg 1.10.4 and KDE 4.7. I tried finding a
monitor setting for enabling black and white, however I could not find
one.

Note that this question originally appears on SuperUser, but as there
was no reply there I crosspost to the *buntu experts!
http://superuser.com/questions/371494/how-to-change-display-to-black-and-white-on-demand

Thanks! Merry Christmas and happy Chanukah to all!

-- 
Dotan Cohen

http://gibberish.co.il
http://what-is-what.com