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References

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  1. G. Wyszecki, J. Opt. Soc. Am. 64, 896 (1974).
  2. G. Wyszecki, G. H. Fielder, J. Opt. Soc. Am. 61, 1135 (1971).
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1974 (1)

G. Wyszecki, J. Opt. Soc. Am. 64, 896 (1974).

1971 (1)

J. Opt. Soc. Am. (2)

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Figures (2)

Fig. 1
Fig. 1

Unit color-difference circles in the CIE 1976 a*, b* chromaticity plane transformed onto the 1931 x, y chromaticity diagram and enlarged 5 times, at the twenty-eight colors for which color matching ellipses are reported in the literature.2

Fig. 2
Fig. 2

Comparison between the transformed CIE 1976 a*, b* unit circle and the experimental color matching ellipses2 for three observers at one color center (no. 19). The smallest ellipse has the same area as the dotted reference circle. The asymmetry of the transformed a*, b* figure can be clearly seen.

Tables (1)

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Table I Axial Ratios

Equations (1)

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L * = 25 ( 100 Y / Y O ) 1 / 3 โˆ’ 16 , Y > 1 a * = 500 [ ( X / X O ) 1 / 3 โˆ’ ( Y / Y O ) 1 / 3 ] b * = 200 [ ( Y / Y O ) 1 / 3 โˆ’ ( Z / Z O ) 1 / 3 ] ,

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