Discussion
Match each CIELAB coordinate with what it represents.
List I
A. L star
B. a star
C. b star
D. C star
List II
1. the yellow to blue opponent axis
2. lightness from zero for black to one hundred for white
3. chroma, the distance from the neutral axis
4. the red to green opponent axis
Answer: B
The a and b axes echo the opponent organisation of the visual system. Chroma and hue angle are the polar form of the same two coordinates. The axes echo the opponent channels. Chroma and hue are their polar equivalents.
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