guys i some couple of question about color manipulation 1) how to convert RGB pixel to Gray 2) how can i extract Y(luminance) from BITMAP(RGB) image 3) how can i add Y(luminance) to R, G and B or to RGB bitmap file any link that can help me understand the theory for the above problem thanks [Edited by - cebugdev on May 19, 2006 10:34:55 PM]

The Color Space FAQ as well as this may be of some help.