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Colour constancy refers to the tendency for

  • A.dyes to resist fading when exposed to sunlight over time
  • B.objects to keep their apparent colour under changing illumination
  • C.colours to appear identical to every single observer without exception
  • D.a colour to remain fixed on a display over long periods

Answer: B

The visual system discounts much of the change in the illuminant. It is imperfect, which is why a fabric chosen in a shop may disappoint in daylight. Compensation is substantial but never complete. The residual failure is what industry has to manage.

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