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The Rosch or MacAdam limits define

  • A.the boundary of the visible spectrum locus
  • B.the boundary of colours achievable by any real reflecting surface
  • C.how many colours a screen is able to show
  • D.the colours matched by three particular primaries

Answer: B

Correct answer: the boundary of colours achievable by any real reflecting surface

The optimal colour limits, associated with Rosch and with MacAdam, bound what a reflecting surface can achieve at a given lightness, and they are reached by theoretical reflectances that switch between zero and one at particular wavelengths. They lie well inside the spectrum locus, which is bounded by monochromatic light that no reflecting surface can produce.

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