Discussion
Match each phenomenon with what it involves.
List I
A. Metamerism
B. Colour inconstancy
C. Observer metamerism
D. Colour constancy
List II
1. two samples across two observers
2. two samples across two illuminants
3. the visual system discounting the illuminant
4. one sample across two illuminants
Answer: B
Correct answer: A-2, B-4, C-1, D-3
The four are distinguished by what varies and what stays fixed. Metamerism is two samples across two illuminants; colour inconstancy is one sample across two illuminants; observer metamerism is two samples across two observers; and colour constancy is the perceptual mechanism that discounts the illuminant so that a surface looks much the same under both.
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