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In the language of optics, red is the color evoked by light that stimulates neither the S or the M (short and medium wavelength) cone cells of the retina, combined with a fading stimulation of the L (long-wavelength) cone cells.
Primates can distinguish the full range of the colors of the spectrum visible to humans, but many kinds of mammals, such as dogs and cattle, have dichromacy, which means they can see blues and yellows, but cannot distinguish red and green (both are seen as gray).
Red also became the color of revolution; Soviet Russia adopted a red flag following the Bolshevik Revolution in 1917, later followed by China, Vietnam, and other communist countries.
Since red is the color of blood, it has historically been associated with sacrifice, danger and courage.
In modern color theory, also known as the RGB color model, red, green and blue are additive primary colors.
Red, green and blue light combined together makes white light, and these three colors, combined in different mixtures, can produce nearly any other color.
The intensity of each component is measured on a scale of zero to 255, which means the complete list includes 16,777,216 distinct colors and shades.
The s RGB number of pure red, for example, is 255, 00, 00, which means the red component is at its maximum intensity, and there is no green or blue.
Iron oxide also gives the red color to the planet Mars.Today, red and red-orange laser diodes are widely available to the public in the form of extremely inexpensive laser pointers.Portable, high-powered versions are also available for various applications.This is the principle that is used to make all of the colors on your computer screen and your television.For example, purple on a computer screen is made by a similar formula to that used by Cennino Cennini in the Renaissance to make violet, but using additive colors and light instead of pigment: it is created by combining red and blue light at equal intensity on a black screen.
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On the color wheel long used by painters, and in traditional color theory, red is one of the three primary colors, along with blue and yellow.