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The Helmholtz Kohlrausch effect describes the tendency for

  • A.lightness to depend only on the luminance factor
  • B.saturated colours to appear lighter than their L star suggests
  • C.saturated colours to appear darker than their L star suggests
  • D.all colours to appear identical in lightness at equal Y

Answer: B

A saturated blue looks brighter than a grey of the same luminance factor. CIELAB lightness takes no account of it and consequently misleads. Saturated colours look lighter than their L star. CIELAB has no term to represent it.

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