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State whether the following is true or false.
Two samples of equal L star can differ noticeably in apparent lightness if their chroma differs.

  • A.True only at large scales
  • B.False only at small scales
  • C.True
  • D.False

Answer: C

The Helmholtz Kohlrausch effect makes the more saturated one look lighter. CIELAB lightness is a function of luminance factor alone. Chroma plays no part in the L star calculation. Luminance factor alone determines lightness.

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