Visual structures for achromatic color perceptions
نویسندگان
چکیده
منابع مشابه
Visual structures for achromatic color perceptions.
Accuracy of achromatic perceptions (correctly seeing blacks, grays, and whites) was investigated for three-dimensional rooms, painted matte black or white, presented empty or containing matte or specular, and black, middle gray, or white objects. The rooms were illuminated by a point source at various locations or by extended sources. Observers judged the achromatic color of four walls in the r...
متن کاملRelational color constancy in achromatic and isoluminant images.
Relational color constancy, which refers to the constancy of perceived relations between surface colors under changes in illuminant, may be based on the computation of spatial ratios of cone excitations. As this activity need occur only within rather than between cone pathways, relational color constancy might be assumed to be based on relative luminance processing. This hypothesis was tested i...
متن کاملSimultaneous contrast and gamut relativity in achromatic color perception
Simultaneous contrast refers to the respective whitening or blackening of physically identical image regions surrounded by regions of low or high luminance, respectively. A common method of measuring the strength of this effect is achromatic color matching, in which subjects adjust the luminance of a target region to achieve an achromatic color match with another region. Here I present psychoph...
متن کاملLightness dependence of achromatic loci in color-appearance coordinates
Shifts in the appearance of color under different illuminant chromaticity are known to be incomplete, and fit nicely with a simple linear transformation of cone responses that aligns the achromatic points under two illuminants. Most chromaticity-transfer functions with von-Kries-like transformations use only one set of values to fit the color shifts from one illuminant to another. However, an a...
متن کاملColor constancy in the nearly natural image. 2. Achromatic loci.
Most empirical work on color constancy is based on simple laboratory models of natural viewing conditions. These typically consist of spots seen against uniform backgrounds or computer simulations of flat surfaces seen under spatially uniform illumination. In this study measurements were made under more natural viewing conditions. Observers used a projection colorimeter to adjust the appearance...
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ژورنال
عنوان ژورنال: Perception & Psychophysics
سال: 1984
ISSN: 0031-5117,1532-5962
DOI: 10.3758/bf03202672