Discussion
Assertion (A): A given hue angle difference matters more at high chroma than at low.
Reason (R): The arc length corresponding to an angle grows with the radius from the neutral axis.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Arc length is the angle times the radius, and chroma is the radius in this space, so five degrees of hue at a chroma of 60 is a far larger displacement than five degrees at a chroma of 10. This is why hue tolerances are expressed as \( \Delta H^* \) rather than in degrees.
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