primary colors

primary colors
1. a small number of fundamental colors; in visual science this refers to red, green, and blue, the colors specifically picked up by the retinal cones; mixtures of varying proportions of the primary colors will yield the 150 discriminable hues of normal human vision. 2. any of various other small groups of fundamental colors. For the painter and printer, blue, yellow, and red (or magenta); in the Newton theory, the seven rainbow hues of violet, indigo, blue, green, yellow, orange, and red; in the Helmholtzian theory (old school), red, green, and blue (or violet); and in the Hering theory, four paired complementary hues, red-green and blue-yellow, plus a black-white pair. There are other theories that list five to seven colors as primaries.

Medical dictionary. 2011.

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