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Illuminant metamerism is the most commonly encountered kind because

  • A.geometry can never be controlled in practice
  • B.the field size is always different for each individual viewer
  • C.goods are routinely seen under several different light sources
  • D.observers vary more than illuminants ever do

Answer: C

Correct answer: goods are routinely seen under several different light sources

A garment is chosen under shop lighting, examined at the window in daylight and worn under a tungsten lamp in the evening, so the illuminant changes constantly in ordinary use while the observer usually does not. The exposure to change is what makes illuminant metamerism the practical problem.

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