Discussion
Match each perceptual attribute of colour with its meaning.
List I
A. Hue
B. Lightness
C. Chroma
D. Saturation
List II
1. colourfulness judged relative to a similarly lit white
2. the attribute described as red, green, blue and so on
3. colourfulness judged relative to its own brightness
4. brightness judged relative to a similarly lit white
Answer: B
Correct answer: A-2, B-4, C-1, D-3
Four attributes describing four different things. Hue is the attribute named by the colour words. Lightness is brightness judged relative to a similarly lit white, which is what makes it independent of the light level. Chroma is colourfulness judged against the same white reference, and saturation is colourfulness judged against the stimulus’s own brightness - the same quantity referred to two different denominators.
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