This is interesting. From the article linked below: Every original digital picture is overlaid by a weak noise-like pattern of pixel-to-pixel non-uniformity. Although these patterns are invisible to the human eye, the unique reference pattern or "fingerprint" of any camera can be electronically extracted by analyzing a number of images taken by a single camera. Fridrich's lab analyzed 2,700 pictures taken by nine digital cameras and with 100 percent accuracy linked individual images with the camera that took them.
http://www.eurekalert.org/pub_releases/2006-04/bu-bur041806.php j -- Juan Buhler Water Molotov: http://photoblog.jbuhler.com Slippery Slope: http://color.jbuhler.com
