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Extending metamerism reasoning beyond the visible range matters for

  • A.ordinary retail colour matching of textiles
  • B.the routine calibration of visible range spectrophotometers
  • C.the definition of the standard observer
  • D.applications where infrared or ultraviolet detection is used

Answer: D

A pair matching visually may differ greatly outside the visible band. Military and security applications routinely specify performance across a wider range. Infrared behaviour is entirely unconstrained by a visual match.

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