>>If you use GIMP, it's called "Desaturate."
>>
>>www.gimp.org
>
>Desaturate is also another way to do it. Whlie it was not highly recommended, I could have considered that if I would have had CS4.


The formula is: gray = red*0.35 + green*0.54 + blue*0.11

Just iterate pixel by pixel. :-)