Red is the color at the longer-wavelengths end of the spectrum of visible light next to orange, at the opposite end from violet. Red color has a predominant light wavelength of roughly 620–740 nanometers. Light with a longer wavelength than red but shorter than terahertz radiation and microwave is called infrared.
Red is one of the additive primary colors of visible light, along with green and blue, which in Red Green Blue (RGB) color systems are combined to create all the colors on a computer monitor or television screen. Red is one of the subtractive secondary colors, resulting from the combination of yellow and magenta. (See CMYK color model.) Traditionally, it was viewed as a primary subtractive colour, along with yellow and blue, in the RYB color space and traditional color wheel formerly used by painters and artists. Reds can vary in shade from very light pink to very dark maroon or burgundy; and in hue from the bright orange-red scarlet or vermilion to the bluish-red crimson. Red is the complementary color of cyan. Wikipedia
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