Mathematically, the gamut created in this way contains so-called imaginary or fictitious colors. Therefore, one selects colors outside of the region of real colors as primary colors in other words, imaginary or fictitious primary colors. The gamut can be increased by selecting more than three real primary colors, but since the region of real colors is not a polygon, there will always be some colors at the edge left out. Since the region of real colors is not a triangle (see illustration), it is not possible to pick three real colors that span the whole region. When defining primaries, the goal is often to leave as many real colors in gamut as possible. Any colors outside of this triangle cannot be obtained by mixing the chosen primaries. By mixing any three colors, one can therefore create any color contained in the triangle they describe-this is called the gamut formed by those three colors, which are called primary colors. When colors are displayed in the CIE 1931 XYZ color space, additive mixture results in color along the line between the colors being mixed. 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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