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A colorimeter using tristimulus filters is limited because

  • A.it requires spectral data as an input
  • B.it works only on transparent samples
  • C.the filters only approximate the colour matching functions
  • D.it cannot measure any reflectance whatever at any wavelength

Answer: C

Departures from the exact functions introduce systematic errors for some samples. Metameric samples in particular are handled poorly. Filter departures introduce systematic errors. Metameric samples expose them most clearly.

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