Discussion
A colour matching experiment asks an observer to
Answer: D
Correct answer: adjust three primaries until they match a test light
The colour matching experiment is a null method: the observer adjusts the amounts of three primaries in one half of a bipartite field until it is indistinguishable from the test light in the other half. It asks for a judgement of identity rather than of appearance, which is what makes the results reproducible enough to build a system on.
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