Discussion
Match each colour difference formula with its origin.
List I
A. Delta E ab
B. CMC
C. CIE94
D. CIEDE2000
List II
1. a CIE recommendation with chroma dependent weights
2. the simple Euclidean distance in CIELAB
3. the current CIE recommendation with a rotation term
4. the Colour Measurement Committee, for textiles
Answer: D
Each was an attempt to correct the non-uniformity of the underlying space. The later formulae were fitted to progressively larger sets of visual data. Each corrects the space a little further. Larger visual data sets underpin the later ones.
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