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How many primaries are needed to enclose a larger area on the chromaticity diagram than three can?

  • A.four or more
  • B.two
  • C.one
  • D.three is the maximum possible

Answer: A

A fourth primary extends the polygon and adds area to the gamut. Multi-primary displays exploit exactly this at the cost of greater complexity. A polygon of more vertices encloses more area. Returns diminish with each primary added.

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