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All of the following are colour difference formulae EXCEPT

  • A.CMC with its lightness and chroma weightings
  • B.CIEDE2000 with its rotation term
  • C.the CIE colour rendering index
  • D.Delta E ab, the Euclidean distance in CIELAB

Answer: C

Correct answer: the CIE colour rendering index

The rendering index measures how faithfully a light source reveals colours compared with a reference illuminant - a property of the source, not a difference between two samples. CMC, CIEDE2000 and \( \Delta E^*_{ab} \) are all colour difference formulae, differing only in how they weight the components.

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