Discussion
Match each CIE quantity with what it represents.
List I
A. X
B. Y
C. Z
D. x and y
List II
1. a tristimulus value weighted to the short wavelengths
2. a tristimulus value with no direct perceptual meaning
3. chromaticity coordinates independent of luminance
4. the luminance or luminance factor of the sample
Answer: B
Only Y has a direct interpretation, by deliberate design of the system. The chromaticity coordinates separate the colour quality from the brightness. Only Y was given a direct interpretation. X and Z are mathematical conveniences alone.
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