Spectral color
（重定向自Spectral colour）
![The CIE xy chromaticity diagram.
The spectrum colors are the colors on the horseshoe-shaped curve on the outside of the diagram. All other colors are not spectral: the bottom straight 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. White is in the central part of the interior of the diagram, since when all colors of light are mixed together, they produce white.](/Images/godic/202502/12/CIE1931xy_blank.svg4003.png")
![This metrically accurate diagram shows that the spectral locus is almost flat on the red – bright green segment, is strongly curved around green, and becomes less curved between green/cyan and blue](/Images/godic/202502/12/CIE_1976_UCS4003.png")
A spectral color is a color that is evoked by a single wavelength of light in the visible spectrum, or by a relatively narrow band of wavelengths, also known as monochromatic light. Every wavelength of visible light is perceived as a spectral color, in a continuous spectrum; the colors of sufficiently close wavelengths are indistinguishable.