Primary colors are sets of colors that can be combined to make a useful range of colors. For human applications, three primary colors are usually used, since human color vision is trichromatic.
For additive combination of colors, as in overlapping projected lights or in CRT displays, the primary colors normally used are red, green, and blue. For subtractive combination of colors, as in mixing of pigments or dyes, such as in printing, the primaries normally used are cyan, magenta, and yellow, though the set of red, yellow, blue is popular among artists. See RGB color model, CMYK color model, and RYB color model for more on these popular sets of primary colors.
Any particular choice for a given set of primary colors is derived from the spectral sensitivity of each of the human cone photoreceptors; three colors that fall within each of the sensitivity ranges of each of the human cone cells are red, green, and blue. Other sets of colors can be used, though not all will well approximate the full range of color perception. For example, an early color photographic process, autochrome, typically used orange, green, and violet primaries. However, unless negative amounts of a color are allowed the gamut will be restricted by the choice of primaries.
The combination of any two primary colors creates a secondary color.
The most commonly used additive color primaries are the secondary colors of the most commonly used subtractive color primaries, and vice versa.
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... See also Natural Color System, Unique hues The opponent process is a color theory that states that the human visual system interprets information about color by processing signals from cones and rods in an antagonistic ... The opponent color theory suggests that there are three opponent channels red versus green, blue versus yellow, and black versus white ... Responses to one color of an opponent channel are antagonistic to those of the other color ...
... Kelly Green Color coordinates Hex triplet #4CBB17 sRGBB (r, g, b) (76, 187, 23) CMYKH (c, m, y, k) (59, 0, 88, 27) HSV (h, s, v) (101°, 87%, 73%) Source B ... fact that the surname Kelly, as well as the color green, are both popular in Ireland ... The first recorded use of the term kelly green as a color name in English was in 1917 ...
... goes either to three digital-to-analog converters (DACs) (for analog monitors), one per primary color, or directly to digital monitors ... Modern systems encode pixel color values by devoting eight bits to each of the R, G, and B components ... be either carried directly by the pixel bits themselves, or provided by a separate color look-up table (CLUT) if indexed color graphic modes are used ...
Famous quotes containing the words color and/or primary:
“It is never the thing but the version of the thing:
The fragrance of the woman not her self,
Her self in her manner not the solid block,
The day in its color not perpending time,
Time in its weather, our most sovereign lord,
The weather in words and words in sounds of sound.”
—Wallace Stevens (18791955)
“It was the feeling of a passenger on an ocean steamer whose mind will not give him rest until he has been in the engine-room and talked with the engineer. She wanted to see with her own eyes the action of primary forces; to touch with her own eyes the action of primary forces; to touch with her own hand the massive machinery of society; to measure with her own mind the capacity of the motive power. She was bent upon getting to the heart of the great American mystery of democracy and government.”
—Henry Brooks Adams (18381918)