Discussion
Consider the following statements about colour appearance attributes.
1. Chroma is colourfulness relative to a similarly lit white.
2. Saturation is colourfulness relative to the stimulus own brightness.
3. Chroma and saturation are two names for the same quantity.
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 give the two definitions correctly. Statement 3 collapses a distinction that matters: chroma is referred to a similarly lit white and saturation to the stimulus’s own brightness, so a colour in shadow keeps its saturation while its chroma falls. Confusing the two makes appearance predictions go wrong wherever the illumination is uneven.
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