- Branża: Education
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The University of Illinois at Chicago (UIC) is a public university located on three urban campuses in Chicago. UIC ranks in the top 50 US institutions with strong research programs. The university boasts one of the largest medical schools in the US and operates Illinois’ major public medical center ...
A diagram that represents the unit plane (the plane defined by the equation X+Y+Z=1) in a tristimulus space. The location of a stimulus with a particular set of tristimulus values on a chromaticity diagram represents its direction from the origin of the space ignoring its distance. The chromaticity diagram is often used as a convenient approximation to a constant brightness plane in the tristimulus space.
Industry:Physics
Condition of possessing two independent channels for conveying color information. Color matching for dichromats requires only two primaries. Most "color blind" humans are dichromats and have lost the function of one of the cone types and consequently one of the opponent processes. Dichromats are not strictly color blind in the sense that their vision is sensitive to a single chromatic dimension as well as to brightness.
Industry:Physics
A person with normal color vision in one eye and some form of dichromacy in the other. Unilateral dichromats are very rare.
Industry:Physics
A set of techniques for predicting color matches by equating a given stimulus with the amounts of three specified primaries that would be required to match it. The amounts of three primaries that would be required to match the stimulus are the tri-stimulus values of that stimulus for that set of primaries. Any stimuli with the same tri-stimulus values will match perceptually. Tri-stimulus colorimetry is useful because once the tri-stimulus values for spectral lights are determined empirically it is possible to compute the tri-stimulus values of any mixture of spectral lights. Whether two different mixtures of spectral lights will match or not can thus be determined without anyone actually looking at the stimuli. Tri-stimulus colorimeters are used to determine the tri-stimulus values of a stimulus with respect to a standard set of primaries.
Industry:Physics
Consisting of a single wavelength or narrow range of wavelengths. (See spectral light. )
Industry:Physics
Attribute of a visual sensation which permits a judgment to be made of the amounts of pure chromatic color present, irrespective of the amount of achromatic color. For colors of the same hue and brightness, chroma and saturation are equivalent. Chroma will increase with brightness, however, even if saturation is held constant. Chroma is used instead of saturation in the Munsell color system.
Industry:Physics
Attribute of a visual sensation according to which an area appears to emit more or less light. The perceived amount of light coming from an area. "Brightness" is often restricted to apply only to lights and "lightness" is used for the corresponding dimension of the colors of surfaces. One of the three standard elements of color appearance (the other two are hue and saturation). Its colorimetric equivalent is luminance.
Industry:Physics
A perceptual phenomenon in which the color of an area is perceived as closer to the color of the surround than it would if viewed in isolation. Assimilation occurs with stimuli with fine spatial structure, e.g. a thin stripe of color between two black bars will look darker than it would between two white bars. Also known as the Von Bezold spreading effect.
Industry:Physics
The ratio of two lengths on a chromaticity diagram, the first length being the distance between the point representing the specified achromatic stimulus and that representing the color stimulus being considered, and the second being the length of the line connecting the achromatic point to the border of the chromaticity diagram along the same direction as the first line. The colorimetric equivalent of saturation.
Industry:Physics
A shift in apparent color of a stimulus towards yellow or blue with increasing intensity. If a pair of long wavelength lights differing only in intensity are compared, the higher intensity stimulus will look more yellow and less red than the lower intensity light. For shorter wavelengths higher intensity lights look more blue and less green than lower intensity lights. There are three invariant points in the spectrum: monochromatic lights whose color appearance does not change with intensity.
Industry:Physics
