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The CIE XYZ primaries are described as imaginary because they

  • A.were invented before any matching experiments were done
  • B.cannot be represented mathematically in any coordinate system
  • C.correspond to wavelengths beyond the visible spectrum
  • D.lie outside the region of physically realisable colours

Answer: D

Choosing them outside the spectrum locus makes all the matching functions positive. The convenience was deliberate and the primaries were never intended to be realisable. Positive functions throughout was the objective.

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