Color - Chroma

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Chroma is a ratio parameter whereas colorfulness is an absolute property.

  • Chromatic: Having hue
  • Achromatic: Without hue
  • Polychromatic: Having many hues
  • Monochromatic: Having one hue only


The Chroma formula is the saturation (colorfulness) relative to the lightness.

$chroma = (1 - abs(2 * $lightness - 1)) * $saturation;

where lightness and saturation are values in the range 0 to 1 1)

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