colour-matching functions (of a trichromatic system)

tristimulus values of monochromatic stimuli of equal radiant power

NOTE 1 The 3 values of a set of colour-matching functions at a given wavelength are called "colour-matching coefficients" (formerly: "spectral tristimulus values").

NOTE 2 The colour-matching functions may be used to calculate the tristimulus values of a colour stimulus from its colour stimulus functions φλ(λ).

See also CIE 15 Colorimetry

See also ISO 11664-1:2007(E)/CIE S 014-1/E:2006 Colorimetry - Part 1: CIE Standard Colorimetric Observers

NOTE 3 In the CIE standard colorimetric systems, the colour-matching functions are represented by the symbols and  .

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