Discussion
In whiteness formulae written in opponent coordinates, the b term typically carries
Answer: B
Correct answer: a negative coefficient so that a bluer sample scores more highly
In opponent coordinates a negative \( b \) is blue and a positive \( b \) yellow, so subtracting a multiple of \( b \) rewards a sample sitting on the blue side of neutral and penalises a yellow one. That is the whole basis of whitening: yellowness is what makes a substrate look unwhite, and a small blue shift is read by the eye as whiter rather than as blue.
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