Discussion
The CIE94 formula improves on Delta E ab by
Answer: C
Correct answer: applying weighting functions that increase with chroma
\( \Delta E^*_{ab} \) treats CIELAB as though it were perceptually uniform, which it is not - a given distance is far more visible near the neutral axis than out at high chroma. CIE94 divides the chroma and hue terms by weighting functions \( S_C \) and \( S_H \) that grow with chroma, so the acceptance region becomes an ellipse rather than a sphere.
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