How I can add grayscale filter to an image

[Abudahim]

in other words, what is the algorithm of grayscale image . I knew how to invert color and other stuffs but still don't know how to make it grayscale .

thank you

[divil]

http://www.bobpowell.net/grayscale.htm

[Hamburger1984]

maybe this article will help you, too...

 

http://www.codeproject.com/cs/media/csharpgraphicfilters11.asp

[Abudahim]

I'm thankful to you Mr.divil and Mr.Hamburger1984 .

they were so helpfull .