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Chromatic adaptation is the process by which

  • A.the visual system adjusts its sensitivity to the prevailing light
  • B.a dye gradually changes colour on exposure to sunlight
  • C.two different spectra come to match under one single illuminant
  • D.a display is calibrated to a standard white point

Answer: A

Correct answer: the visual system adjusts its sensitivity to the prevailing light

Chromatic adaptation rescales the responses of the three cone types according to the illumination, so that a surface keeps roughly its appearance as the light changes colour. It is the mechanism underlying colour constancy, and it works within the observer - nothing about the object or the light itself changes.

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