CIE UCS chromaticity chart

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Color rendering index — Emitted light spectrum determines the color rendering index of the lamp. Color render … Wikipedia
HSL and HSV — Fig. 1. HSL (a–d) and HSV (e–h). Above (a, e): cut away 3D models of each. Below: two dimensional plots showing two of a model’s three parameters at once, holding the other constant: cylindrical shells (b, f) of constant saturation, in this case… … Wikipedia
Natural Color System — The NCS color model is based on the three pairs of elementary colors (white–black, green–red, and yellow–blue), as defined by color opponency. It is not possible to describe the perceptual appearance of these colors in terms of the perceptual… … Wikipedia

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