getting pixels of a bitmap

I have no idea where to start on something like this...I know I could show an image and get the information by whats on the screen, but sometimes a bitmap won't fit on your screen. So is there a way to just get the RGB value of each pixel in a bitmap without outputting it? :confused:

The GetPixel() API call. You could also use the GetBitmapBits() API to get all of the pixels at once.

Z.