But due to different chromaticity properties of different spectral segments, and also due to practical limitations of light sources, the actual distance between RGB pure color wheel colors and spectral colors shows a complicated dependence on the hue. Theoretically, only RGB-implemented colors which might be really spectral are its primaries: red, green, and blue, whereas any other (mixed) color is inherently non-spectral. If luminance is counted, then spectral colors form a surface, otherwise their locus is a curve in a two-dimensional chromaticity space. In color spaces which include all, or most spectral colors, they form a part of boundary of the set of all real colors.
In color models capable of representing spectral colors, such as CIELUV, a spectral color has the maximal saturation. One needs at least trichromatic color vision for there to be a distinction between spectral and non-spectral colours: trichromacy gives a possibility to perceive both hue and saturation in the chroma. In modern divisions of the spectrum, indigo is often omitted. Less commonly, 'VIBGYOR' is also used for the reverse order. The division used by Isaac Newton, in his color wheel, was: red, orange, yellow, green, blue, indigo and violet a mnemonic for this order is 'Roy G. In some other languages the ranges corresponding to color names do not necessarily agree with those in English. Traditional colors in English include: red, orange, yellow, green, blue, and violet. The spectrum is often divided into named colors, though any division is somewhat arbitrary the spectrum is continuous. Every wavelength of visible light is perceived as a spectral color, in a continuous spectrum the colors of sufficiently close wavelengths are indistinguishable for the human eye.
A spectral color is a color that is evoked in a normal human by a single wavelength of light in the visible spectrum, or by a relatively narrow band of wavelengths, also known as monochromatic light.
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