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Chroma C star in CIELAB is calculated as

  • A.the arithmetic sum of a star and b star taken directly
  • B.the product of a star and b star
  • C.the difference of a star and b star
  • D.the square root of a star squared plus b star squared

Answer: D

It is simply the distance from the neutral axis in the a b plane. A neutral grey has zero chroma whatever its lightness may be. Distance from the neutral axis is the definition. Neutral samples have zero chroma exactly.

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