Whenever I scanned this with just the blue, it came out really fuzzy, blurry and indistinguishable. If you look in the corner, you can see a blue, pencil, and ink mark. That helps the scan, because if those aren't there, the scanner thinks something's wrong and tries to adjust the image on it's own. If it's just blue, it adjusts things so that the paper's orange and the lines are green. I don't know, I'm slowly working the kinks out of this cheap scanner. Also, my old one won't work now, so it's this big cheap one or nothing.