Discussion
Match each kind of metamerism with what varies.
List I
A. Illuminant metamerism
B. Observer metamerism
C. Geometric metamerism
D. Field size metamerism
List II
1. the viewing or illumination angle changes
2. the light source is changed
3. the angular size of the sample changes
4. the observer is changed
Answer: C
In every case a pair matches under one condition and fails under another. The underlying cause is always that the spectral curves differ while the tristimulus values agree. Any change of condition breaks the coincidence.
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