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Discussion

The saturation correlate s uv is available in CIELUV but not in CIELAB because

  • A.CIELUV retains an associated chromaticity diagram
  • B.CIELAB has no lightness coordinate to divide by
  • C.saturation is undefined for surface colours
  • D.CIELAB was defined before saturation was understood

Answer: A

Saturation requires a chromaticity measure independent of lightness. CIELAB provides chroma but no corresponding saturation correlate. A chromaticity measure is needed for saturation. CIELAB provides chroma but not saturation.

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