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A spectrophotometer differs from a tristimulus colorimeter in that the spectrophotometer

  • A.reads the reflectance at many separate wavelengths in turn
  • B.measures three filtered readings and computes the values
  • C.requires no light source of its own to operate
  • D.works on transmitting samples but never on reflecting ones

Answer: A

Spectral data allows values to be recomputed for any illuminant and observer. A colorimeter commits to one condition at the moment of measurement. Spectral data can be reprocessed at any time. Nothing need be decided at the moment of reading.

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