Comment by coldsmoke

Actually, come to think of it, every image is created to trick the brain's image processing. When viewing real scenery the eyes get hit by photons of all sorts of colors, but since there are only three different color receptors (with overlap) we can trick the brain into thinking an image with only red, green, and blue in it is the same. But for example some birds that can see ultra violet will probably not recognize an image of a flower since it lacks that spectrum.