Most films that you watch try to replicate the "natural" look of the world you see with your eye. But other films purposely create an unrealistic color scheme sometimes to invoke and emotions other times to simulate something surreal or unnatural.
Different from the painter's color scheme, the primary colors of film are red, green, and blue. These three colors are known as additive colors. Also unlike the art world the base of all primary colors when mixed together is white instead of black.
