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Chromaticity

For the album by Tony MacAlpine, see Chromaticity (album).
The CIE 1931 xy chromaticity space, also showing the chromaticities of black-body light sources of various temperatures, and lines of constant correlated color temperature
sRGB gamut plotted in xyY color space (chromaticity + luminosity)

Chromaticity is an objective specification of the quality of a color regardless of its luminance. Chromaticity consists of two independent parameters, often specified as hue (h) and colorfulness (s), where the latter is alternatively called saturation, chroma, intensity,[1] or excitation purity.[2][3] This number of parameters follows from trichromacy of vision of most humans, which is assumed by most models in color science.

  1. ^ In modern terminology the word intensity may refer to lightness, not colorfulness.
  2. ^ Emil Wolf (1961). Progress in Optics. North Holland Pub. Co.
  3. ^ Leslie D. Stroebel, Richard D. Zakia (1993). The Focal Encyclopedia of Photography. Focal Press. p. 124. ISBN 978-0-240-51417-8. chromaticity hue saturation chroma colorfulness purity.
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