There's an old saw that holds "a picture never lies," but sometimes it isn't true anymore, says Bob Goldblatt, president of K-L, a custom photo lab here.

Today, you might win a court case by showing a photo in which a "no parking" sign has been removed and absolutely no one could tell, says Goldblatt. This is done with image manipulation, which is done electronically and cannot be detected. The old way that involved the photographic strip method was noticeable to the naked eye.