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Dichromacy - Wikipedia, the free encyclopedia
Dichromacy in humans is a moderately severe color vision defect in which one of the three basic color mechanisms is absent or not functioning. It is hereditary and sex-linked, predominantly affecting...
en.wikipedia.org/wiki/Dichromacy |
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By choosing chromaticities that are confused by red-green dichromats, patterns can be produced that are visible to color normals, but invisible to dichromats, or that appear different to color normals and dichromats (as below).
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Protanopes and Deuteranopes ... Pitt's (1935) luminosity functions ... Hsia & Graham (1957)
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2. The brightness distribution in the spectrum for dichromats falls only partly outside the range established for color-normals. The protanope curve is narrower than normal, and its maximum lies nearly 15 mµ to the left of it.
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Dichromats detect colour-camouflaged objects that are not detected by trichromats. ... To explain the surprisingly high frequency of congenital red-green colour blindness, the suggestion has been made that dichromats might be at an advantage in breaking certain kinds of colour camouflage. We have compared the performance...
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Dichromacy is a less severe form of color defect than monochromacy. Dichromats can tell some hues apart. Dichromacy is divided into three types: protanopia, deuteranopia and tritanopia.
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A large-field substitution procedure for making Rayleigh màtches was used to study the color matches of eight red-green dichromats and two extreme anomalous trichromats. Matches were made under three experimental conditions: (1) During the cone plateau period after a bleach;
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Karl Rasche, Robert Geist, James Westall, "Detail Preserving Reproduction of Color Images for Monochromats and Dichromats," IEEE Computer Graphics and Applications, vol. 25, no. 3, pp. 22-30, May/June, 2005.
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Dichromats are missing one of these three photoreceptor types. ... for light above 560 nm, at low intensities dichromats describe their color percept as "red", at higher intensities however as "yellow".
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Results showed that: (a) Dichromats made more naming errors when low saturation stimuli were used; (b) protanopes made more errors that deuteranopes; ... People with only two cone types in the macular retina are diagnosed as dichromats (Fletcher & Voke, 1985). When, as in red-green pathologies (daltonisms),
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Dichromate
