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unique hues
Unique hue is a term used in certain theories of color vision, which implies that human perception distinguishes between "unique" (psychologically primary) and composite (mixed) hues.〔(Locating Unique Hues )〕 A unique hue is defined as a color which an observer perceives as a pure, without any admixture of the other colors.〔(Variability in Unique Hue Selection )〕 There is a great deal of variability when defining unique hues experimentally.〔(Focal Colors and Unique Hues )〕 Often the results show a great deal of interobserver and intraobserver variability leading to much debate on the number of unique hues.〔(Unique hues and their stimuli )〕 Another source of variability is environmental factors in color naming. Despite the inconsistencies, often four color perceptions are associated as unique; “red”, “green”, “blue”, and “yellow”.
==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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