ABSTRACT
One of the most common forensic uses of imaging is comparing one object or structure to another. Side-by-side images of two bullets, two fibers, two fingerprints, or even two faces are usually presented to show similarities and invite the viewer to conclude that they are pictures of the same person or thing, or the same type of thing. In order to remove potentially confusing irrelevant differences between the images, they are best viewed with the same lighting and colors, the same orientation, and so on.
