Discussion
Consider the following statements about dominant wavelength and purity.
1. They together specify a chromaticity relative to a white point.
2. They depend on which white point is chosen for the calculation.
3. They are perceptually uniform measures of hue and saturation.
Answer: B
The first two are correct and describe the pair of quantities. The third is not so, since the xy diagram is markedly non-uniform perceptually. Geometric purity is not perceived saturation. The diagram is markedly non-uniform throughout.
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