Discussion
Consider the following statements about colour gamut.
1. An additive gamut is bounded by the chromaticities of the primaries.
2. Adding a fourth primary can enlarge the gamut achievable.
3. A sufficiently good system can reproduce every visible colour.
Answer: A
The first two are correct and follow from the geometry. The third is impossible, since real primaries always lie inside the spectrum locus. Real primaries can never reach the boundary. The triangle always lies inside the locus.
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