Discussion
Negative tristimulus values arise in a matching experiment when
Answer: B
Correct answer: a primary must be added to the test field rather than the match
Some test colours are more saturated than any mixture of the three primaries can achieve, so the observer desaturates the test instead by adding one primary to its side of the field. That amount is recorded as negative, since algebraically it has been moved across the equation - and it is why the RGB matching functions dip below zero.
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