Презентация PRIMARY COLOURS

This article is about colors. For other uses, see Primary Colors.

Primary colors refer to the notion that the very large number of color sensations can be effectively simulated by combining a small number of stimuli made from a physical source such as a filament, illuminated pigment mixture etc. Primary color notions are useful in understanding the trichromatic basis of human color vision, but do not completely explain all aspects of color perception (i.e. the opponent process). Red, green and blue phosphors of a pixel on a computer monitor and cyan, magenta and yellow pigments in a printer cartridge are both examples of using a small set of "primaries" to mix a large range of colors; but the specific primary colors used in each of these processes are an outcome of multiple factors (including cost). Understanding why specific primaries are chosen in an application generally involves an understanding of the detailed physics, chemistry and biology of color vision. In summary there are no "true" primary colors defined in terms of wavelengths, pigments or their mixtures; only established heuristics that perform well for color reproduction in different applications (e.g. using a palette of ultramarine blue, burnt umber, cadmium red, yellow ochre and titanium white for oil painting).

The emission spectra of the three phosphors that define theadditive primary colors of a CRT color video display. Unlike subtractive systems that use magenta, yellow, and cyan inks, additive systems such as computer displays mix red, green, and blue light to make all colors.

Primary colors are sets of colors that can be combined to make a useful range of colors. For human applications, three primary colors are typically used, since human color vision is usually trichromatic.

For additive combination of colors, as in overlapping projected lights or in electronic visual displays, the primary colors normally used are red, green, and blue. For a subtractive combination of colors, as in mixing of pigmentsor dyes for printing, the colors magenta, yellow, and cyan are normally used.^[1] However, red, yellow, and blue are commonly used as primaries when painting or drawing.^[2] See RGB color model, CMYK color model, and RYB color model for more on these popular sets of primary colors