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Color models - Tristimulus color space | | Color models - Tristimulus color space: Encyclopedia II - Color models - Tristimulus color space | |
The human tristimulus color space.
One can picture this space as a region in three-dimensional Euclidean space if one identifies the x, y, and z axes with the stimuli for the long-wavelength (L), medium-wavelength (M), and short-wavelength (S) receptors. The origin, (S,M,L) = (0,0,0), corresponds to black. White has no definite position in this diagram; rather it is defined according to the color temperature or white balance as desired or as available from ambient ...
See also:Color models, Color models - Tristimulus color space, Color models - Tristimulus color space as a mathematical projection, Color models - CIE XYZ color space, Color models - RGB color space, Color models - CMYK color model, Color models - HLS color space, Color models - HSV color space, Color models - Color systems | | | Color models, Color models - CIE XYZ color space, Color models - CMYK color model, Color models - Color systems, Color models - HLS color space, Color models - HSV color space, Color models - RGB color space, Color models - Tristimulus color space, Color models - Tristimulus color space as a mathematical projection, Color space., Color | | |
| | | Color models: Encyclopedia II - Color models - Tristimulus color space
Color models - Tristimulus color space
The human tristimulus color space.
One can picture this space as a region in three-dimensional Euclidean space if one identifies the x, y, and z axes with the stimuli for the long-wavelength (L), medium-wavelength (M), and short-wavelength (S) receptors. The origin, (S,M,L) = (0,0,0), corresponds to black. White has no definite position in this diagram; rather it is defined according to the color temperature or white balance as desired or as available from ambient lighting. The human color space is a horse-shoe-shaped cone such as shown here (see also CIE chromaticity diagram below), extending from the origin to, in principle, infinity. In practice, the human color receptors will be saturated or even be damaged at extremely-high light intensities, but such behavior is not part of the CIE color space and neither is the changing color perception at low light levels (see: Kruithof curve).
The most saturated colors are located at the outer rim of the region, with brighter colors farther removed from the origin. As far as the responses of the receptors in the eye are concerned, there is no such thing as "brown" or "gray" light. The latter color names refer to orange and white light respectively, with an intensity that is lower than the light from surrounding areas. One can observe this by watching the screen of an overhead projector during a meeting: one sees black lettering on a white background, even though the "black" has in fact not gotten darker than the white screen on which it is projected before the projector was turned on. The "black" areas have not actually become darker but appear "black" relative to the higher intensity "white" projected onto the screen around it. See also color constancy above.
The human tristimulus space has the property that additive mixing of colors corresponds to the adding of vectors in this space. This makes it easy to, for example, describe the possible colors (gamut) that can be constructed from the red, green, and blue primaries in a computer display.
Other related archivesAdditive color, CIE 1931 color space, CIE chromaticity diagram, CMYK, Color, Color space, Euclidean space, Ewald Hering, HLS color space, HSV color space, Hilbert spaces, Human tristimulus color space, International Commission on Illumination, Kruithof curve, L2, Munsell color system, RGB, RGB color model, absolute value, additive color, black, blue, brightness, color blindness, color constancy, color model, color space, color temperature, color wheel, cone, cyan, frequency response, gamut, green, integrable, magenta, orthogonal projections, primary colors, prism, real projective plane, red, saturation, subtractive, yellow
 Adapted from the Wikipedia article "Tristimulus color space", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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