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A colour matching function is best described as

  • A.the reflectance of a standard white reference tile
  • B.the power emitted by the illuminant at each wavelength
  • C.the amount of each primary needed to match each wavelength
  • D.the spectral sensitivity of one single cone type directly

Answer: C

Correct answer: the amount of each primary needed to match each wavelength

The matching functions are the experimental results themselves: for each monochromatic wavelength, how much of each of the three primaries was needed to match it. They depend on the primaries chosen, which is why the RGB and XYZ functions look quite different while describing the same visual system.

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