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Color appearance model
・ Color argument
・ Color as a Way of Life
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Color appearance model : ウィキペディア英語版
Color appearance model
A color appearance model (abbreviated CAM) is a mathematical model that seeks to describe the perceptual aspects of human color vision, i.e. viewing conditions under which the appearance of a color does not tally with the corresponding physical measurement of the stimulus source. (In contrast, a color model defines a coordinate space to describe colors, such as the RGB and CMYK color models.)
==Color appearance==
Color originates in the mind of the observer; “objectively”, there is only the spectral power distribution of the light that meets the eye. In this sense, ''any'' color perception is subjective. However, successful attempts have been made to map the spectral power distribution of light to human sensory response in a quantifiable way. In 1931, using psychophysical measurements, the International Commission on Illumination (CIE) created the XYZ color space〔“XYZ” refers to a color ''model'' and a color ''space'' at the same time, because the XYZ color space is the only color space that uses the XYZ color model. This differs from e.g. the RGB color model, which many color spaces (such as sRGB or Adobe RGB (1998)) use.〕 which successfully models human color vision on this basic sensory level.
However, the XYZ color model presupposes specific viewing conditions (such as the retinal locus of stimulation, the luminance level of the light that meets the eye, the background behind the observed object, and the luminance level of the surrounding light). Only if all these conditions stay constant will two identical stimuli with thereby identical XYZ tristimulus values create an identical color ''appearance'' for a human observer. If some conditions change in one case, two identical stimuli with thereby identical XYZ tristimulus values will create ''different'' color ''appearances'' (and vice versa: two different stimuli with thereby different XYZ tristimulus values might create an ''identical'' color ''appearance'').
Therefore, if viewing conditions vary, the XYZ color model is not sufficient, and a color appearance model is required to model human color perception.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Color appearance model」の詳細全文を読む



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