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Discussion

CIELAB was introduced principally to provide

  • A.an approximately uniform three dimensional colour space
  • B.a two dimensional diagram intended for additive mixing work
  • C.a measurement geometry for spectrophotometers
  • D.an agreed list of illuminants for use in assessment

Answer: A

It includes lightness as well as chromaticity, which the two dimensional diagrams omit. Colour differences can be computed as distances within it. Lightness is included, unlike the flat diagrams. Differences become distances in three dimensions.

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