Īny additive mixture of two real colors is also a real color. Imaginary colors in color spaces Īlthough they cannot be seen, imaginary colors are often found in the mathematical descriptions that define color spaces. Such a "hyper-green" color would be in the CIE 1931 color space chromaticity diagram in the blank area above the colored area and between the y-axis and the line x+ y=1. If, for example, M cones could be excited alone, this would make the brain see an imaginary color greener than any physically possible green. Therefore, no wavelength and no spectral power distribution excites only one sort of cone. Light of any wavelength that interacts with M cones also interacts with S or L cones, or both, to some extent. The spectral sensitivity curve of medium-wavelength ("M") cone cells overlaps those of short-wavelength ("S") and long-wavelength ("L") cone cells. No physical object can have an imaginary color. However, some realistic colors still cannot be rendered using the colorants that are available.Ī fictitious color or imaginary color is a point in a color space that corresponds to combinations of cone cell responses in one eye that cannot be produced by the eye in normal circumstances seeing any possible light spectrum. The ProPhoto RGB color space uses fictitious green and blue primaries to obtain a broader gamut (space inside the triangle) than would be possible with three realistic primaries.
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