Discussion
Consider the following statements about the just noticeable difference.
1. A Delta E ab near one is a rough guide to visibility.
2. The actual threshold varies considerably across the space.
3. A Delta E ab of one is exactly at threshold everywhere.
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: unity is a serviceable rule of thumb, and the actual threshold varies greatly across the space. Statement 3 turns a rough guide into a precise claim, and it is false in both directions - a difference of one is clearly visible in some regions and quite invisible in others.
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