The visible portions of the light spectrum, from about 400 to 700 nanometers, give us color. Modern photographic and digital processes give us color, sometimes quite natural, sometimes not.
Color images are ubiquitous in the modern world, so much so that we sometimes cannot see color photographs objectively: when the subject of a photo looks completely natural to us (no matter what the artifice involved in the presentation), we can forget that we are looking not at the subject, but at a reproduction of it. It is easy to judge a color image by its subject, rather than as a purposeful, selected reproduction of something in the real world.
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