Spectral color

Color evoked by a single wavelength of light in the visible spectrum / From Wikipedia, the free encyclopedia

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A spectral color is a color that is evoked by monochromatic light, i.e. either a single wavelength of light in the visible spectrum, or a relatively narrow band of wavelengths (e.g. lasers). Every wavelength of visible light is perceived as a spectral color; when viewed as a continuous spectrum, these colors are seen as the familiar rainbow.

A rainbow is a decomposition of white light into all of the spectral colors.
Laser beams are monochromatic light, thereby exhibiting spectral colors.

All colors that do not qualify as a spectral color are called non-spectral colors or extra-spectral colors. Extra-spectral colors cannot be evoked with a single wavelength of light, but rather by a combination of wavelengths. Likewise, light comprising several wavelengths cannot evoke a spectral color.