Discussion
Assertion (A): Delta E ab is no longer the preferred colour difference measure.
Reason (R): CIELAB is not uniform enough for equal distances to mean equal differences.
Answer: B
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. CIELAB is only roughly uniform, so a distance of one unit is plainly visible near the neutral axis and barely visible at high chroma. CMC, CIE94 and CIEDE2000 all correct for that by weighting the components, and it is those formulae that specifications now cite.
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