Hi all, I'm new to the forums. I recently tried to take an image of two laser dots on a white wall, using my laptop's USB camera. I saved them to PNGs. I have a number of questions... 1. There was an artifact with the green laser, where a smaller second dot appeared for some reason. What caused the artifact? 2. The lasers are AFAIK monochromatic, however the red or green in the images clearly are not monochromatic. Why is this? 3. Why are the central, brightest regions of the laser dots colored as white? My hunch is that it has something to do with the Bayer interpolation algorithm that interprets very bright red/green (and probably, blue) spots as white, without checking whether the other colors are bright too. Cheers, J.