Discussion
Match each correction method with its character.
List I
A. Multiplicative correction
B. Additive correction
C. No correction
D. Parametric correction
List II
1. reporting the raw difference instead
2. scaling the reflectance of one sample
3. adjusting for viewing conditions
4. adding a constant to the reflectance
Answer: B
Correct answer: A-2, B-4, C-1, D-3
The correction methods differ in how they force the pair into agreement under the reference before the test illuminant is applied. A multiplicative correction scales the reflectance of one sample, an additive correction adds a constant to it, a parametric correction adjusts for the viewing conditions, and no correction simply reports the raw difference. Which was used must be stated, because the resulting index depends on it.
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