Discussion
The CIE 1931 standard colorimetric observer is based on a field size of
Answer: B
Correct answer: two degrees
The 1931 observer was derived from matches made in a two degree bipartite field, which is about the angular size of a thumbnail at arm’s length and corresponds to the foveal region. This is why the 1964 ten degree observer was later added for the larger fields typical of practical colour assessment.
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