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impossible color
Impossible colors or forbidden colors are supposed colors that cannot be perceived in normal seeing of light that is a combination of various intensities of the various frequencies of visible light, but are reported to be seen in special circumstances.
==Types==
These impossible colors are of two types:
#Colors that would be seen if the output strengths of the human eye retina's three types of cone cell (red, green, blue) could be set to values which cannot be produced by exposing the eye in normal seeing conditions to any possible combination of strengths of the frequencies of visible light.
#Colors that cannot be seen directly from any combination of retina signal output from one place in one eye, but can be generated in the brain's visual cortex by mixing color signals from the two eyes, or from more than one part of the same eye. Examples of these colors are bluish-yellow and reddish-green.〔 Those colors that appear to be similar to, for example, both red and green, or to both yellow and blue. (This does not mean the result of mixing paints of those two colors in painting, or the result of mixing lights of those two colors on a screen.)
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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