Discussion
Consider the following statements about MacAdam ellipses.
1. They represent just noticeable differences on the diagram.
2. Their size varies greatly with position on the diagram.
3. They are circles of equal size everywhere on the diagram.
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the ellipses bound the just noticeable differences and vary greatly in size across the diagram. Statement 3 states what a perceptually uniform diagram would show and what the xy diagram conspicuously does not - the ellipses are neither circles nor of equal size.
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