Discussion
Consider the following statements about the standard observers.
1. The 1931 observer corresponds to a two degree field.
2. The 1964 observer corresponds to a ten degree field.
3. The two give identical tristimulus values for any sample.
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 give the two observers correctly. Statement 3 is precisely what is not true: they were defined for different field sizes because the retina’s composition varies, and they give different tristimulus values for the same sample - which is why quoting a colour without naming the observer leaves the figure ambiguous.
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