decreasing number of gray levels in a image

hi all, can any one tell me how to decrease the no of gray levels in a image.i have to decrease in the powers of 2. regards k.v.swamy.

Answer 1

Perhaps I don't understand what you want, but why can't you simply divide the image by 2, 4, 8, or whatever power of 2 you want? For examples:

reducedGrayLevelsImage = originalGrayImage / 8;
reducedGrayLevelsImage = originalGrayImage / 16;
reducedGrayLevelsImage = originalGrayImage / 4;

Is that all you're looking for? Or is it more complicated than that? If so, explain the nuances that I've overlooked.