In reality, the spectral bandwidth of most primaries means that most color spaces are entirely non-spectral. In this case, all other colors are inherently non-spectral. For example, the spectral locus of the CIEXYZ chromaticity diagram contains all the spectral colors (to the eye of the standard observer).Ī trichromatic color space is defined by three primary colors, which can theoretically be spectral colors. When excluding luminance and considering a two-dimensional color space ( chromaticity diagram), the spectral colors form a curve known as the spectral locus. When considering a three- dimensional color space (which includes luminance), the spectral colors form a surface. In color spaces which include all, or most spectral colors, they form a part of boundary of the set of all real colors. White is in the central part of the interior of the diagram, since when all colors of light are mixed together, they produce white. All other colors are not spectral: the bottom line is the line of purples, whilst within the interior of the diagram are unsaturated colors that are various mixtures of a spectral color or a purple color with white, a grayscale color. CIE xy chromaticity diagram The spectrum colors are the colors on the horseshoe-shaped curve on the outside of the diagram.
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