Discussion
Match each measurement geometry with its characteristic.
List I
A. 45 to 0
B. 0 to 45
C. d to 8 SCI
D. d to 8 SCE
List II
1. diffuse illumination, specular included
2. directional, specular always excluded
3. diffuse illumination, specular excluded
4. directional, specular always excluded
Answer: C
Correct answer: A-2, B-4, C-1, D-3
The two directional geometries, 45 to 0 and 0 to 45, place the illumination and the detection so that the specular reflection never reaches the detector, so the specular component is excluded by the geometry itself and cannot be included. The sphere geometries illuminate diffusely, and the specular component is then included or excluded according to whether the gloss trap is open.
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