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The gamut of an additive system with three primaries is

  • A.the whole area enclosed by the spectrum locus
  • B.a single point located at the white point of the diagram
  • C.a curved region following the Planckian locus
  • D.the triangle joining the three primary chromaticities

Answer: D

Any colour inside the triangle can be matched by some combination of the three. Colours outside it cannot be reached without a negative amount. The triangle bounds what three primaries can do. Outside it requires a negative amount.

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