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Excitation purity of a colour expresses

  • A.how far it lies from the white point towards the spectrum locus
  • B.the proportion of the whole spectrum that the sample reflects
  • C.how chemically pure the colourant in the sample happens to be
  • D.the total luminance of the sample relative to a white

Answer: A

It runs from zero at the white point to one on the locus itself. It is a geometric quantity on the diagram rather than a perceptual attribute. Zero at the white point and one on the locus. It is a geometric rather than perceptual measure.

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