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The most robust specification against metamerism requires

  • A.a single tight colour difference tolerance and nothing more
  • B.assessment by a single trained observer
  • C.measurement on a single agreed instrument
  • D.agreement under several illuminants and a spectral tolerance

Answer: D

A spectral tolerance constrains the curve shape rather than the integrals alone. It is demanding but gives the most durable match. Curve shape rather than integrals is constrained. It is demanding but the most durable.

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