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Red is the color at the long wavelength end of the visible spectrum of light, next to orange and opposite violet. It has a dominant wavelength of approximately 625–740 nanometres. [ 1] It is a primary color in the RGB color model and a secondary color (made from magenta and yellow) in the CMYK color model, and is the complementary color of cyan.
Red (RGB), RGB red, or electric red[citation needed] (as opposed to pigment red, shown below) is the brightest possible red that can be reproduced on a computer monitor. This color is an approximation of an orangish red spectral color. It is one of the three primary colors of light in the RGB color model, along with green and blue.
Special-purpose color spaces. The rg chromaticity space is used in computer vision applications, and shows the color of light (red, yellow, green, etc.), but not its intensity (dark, bright). LMS color space (long, medium, short), a perceptual color space based on the response functions of the cones in the retina of the eye.
The CIELAB color space, also referred to as L*a*b*, is a color space defined by the International Commission on Illumination (abbreviated CIE) in 1976. [a] It expresses color as three values: L* for perceptual lightness and a* and b* for the four unique colors of human vision: red, green, blue and yellow. CIELAB was intended as a perceptually ...
Ochre. Ochre ( / ˈoʊkər / OH-kər; from Ancient Greek ὤχρα (ṓkhra), from ὠχρός (ōkhrós) 'pale'), iron ochre, or ocher in American English, is a natural clay earth pigment, a mixture of ferric oxide and varying amounts of clay and sand. [ 1] It ranges in colour from yellow to deep orange or brown. It is also the name of the ...
Carmine color is the general term for some deep red colors that are very slightly purplish but are generally slightly closer to red than the color crimson is. Some rubies are colored the color shown below as rich carmine. The deep dark red color shown at right as carmine is the color of the raw unprocessed pigment, but lighter, richer, or ...
The colour blood red is a dark shade of the colour red meant to resemble the colour of human blood (which is composed of oxygenated red erythrocytes, white leukocytes, and yellow blood plasma ). [2] It is the iron in hemoglobin specifically that gives blood its red colour. The actual colour ranges from crimson to a dark brown-blood depending on ...
Oxblood or ox-blood is a dark shade of red. It resembles burgundy, but has less purple and more dark brown hues. The French term sang-de-bœuf, or sang de bœuf, with the same meaning (but also "ox blood") is used in various contexts in English, [ 3] but especially in pottery, where sang de boeuf glaze in the color is a classic ceramic glaze in ...