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Color temperature is a parameter describing the color of a visible light source by comparing it to the color of light emitted by an idealized opaque, non-reflective body. The temperature of the ideal emitter that matches the color most closely is defined as the color temperature of the original visible light source.
Below is a chart showing the computer web color grays. An achromatic gray is a gray color in which the red, green, and blue codes are exactly equal. The web colors gray, gainsboro, light gray, dark gray, and dim gray are all achromatic colors.
Magenta is variously defined as a purplish-red, reddish-purple, or a mauvish–crimson color. On color wheels of the RGB and CMY color models, it is located midway between red and blue, opposite green. Complements of magenta are evoked by light having a spectrum dominated by energy with a wavelength of roughly 500–530 nm.
The spectral colors from red to violet are divided by the notes of the musical scale, starting at D. The circle completes a full octave, from D to D. Newton's circle places red, at one end of the spectrum, next to violet, at the other. This reflects the fact that non-spectral purple colors are observed when red and violet light are mixed.
Physical descriptions of color can be additive (describes mixing of light, RGB) or subtractive (describes mixing of pigment or removal of light, CMYK). Descriptions based on human perception are based on some experimental results on humans. Some models and their variants are employed in parts of the color spaces listed below. [1]
The Munsell color system is a color space that specifies colors based on three color dimensions: hue, value , and chroma (colorfulness), spaced uniformly (in terms of human perception) in three dimensions in the Munsell color solid. In order for all the colors to be spaced uniformly, it was found necessary to use a color wheel with five, non ...
The color defined as yellow in the NCS or Natural Color System is shown at right (NCS 0580-Y). The Natural Color System is a color system based on the four unique hues or psychological primary colors red, yellow, green, and blue. The NCS is based on the opponent process theory of vision. The “Natural Color System” is widely used in Scandinavia.
The web color dim gray is a dark tone of gray. The color name dim gray first came into use in 1987, when this color was formulated as one of the colors on the X11 color list, introduced that year. After the invention of the World Wide Web in 1991, these colors became known as the "X11 web colors".