I have an image in a picturebox loaded with bitblt. Now I want to get the region of a color in that image. So I thought, if I could get all the pixels in a 2D-long-array I could go through all of them to see wich pixels have the right color so I can make a region.

But, how can I get all the pixels into a 2D-pixel-array?
Or does someone know a faster way to get the region of a color?