I want to change my saturation level to zero and again to default but I can do it manually by going to ati catalyst center.

Since, I want to do it regularly I need some batch file code or program to alter this settings in a click or using shortcut keys.

The reason I am doing this because I want to change my screen to black and white from color since b/w will make my eyes less tired then a colored display.

I came to know about this saturation from my previously asked question :

Changing display color from B/W to color (vice-versa)using a program.