Abstract

The area of the gamut, in a uniform chromaticity-scale diagram of the chromaticities of a standard array of object colors, is taken to be a measure of color-discrimination capability of an illuminant. The 1960 CIE <i>u, v</i> chromaticity diagram, and the eight test colors of the interim method for computing a color-rendering index, are used for demonstration. Correlation with long-standing subjective evaluations of color rendering of eight commercial lamps is shown. Artificial illuminants excel daylight and the equal-energy spectrum in the gamut of chromaticities of illuminated samples.

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  1. If color space is likened to a pudding, and the perceived chromaticity-lightness coordinates of the many object colors in a scene are the plums, we define the illuminant with the highest color-discrimination capability as that one which leads to maximum mean interplum distance.
  2. D. L. MacAdam, Appl. Opt. 10, 1 (1971).
  3. IES Subcommittee on Color Rendering, Illum. Engr. 57, 471 (1962); Commission Intern, de l'Eclairage (CIE), Publ. CIE No. 13 (E-1.3.2) (Bureau Central de la CIE, 57 rue Cuvier, Paris, France, 1965).
  4. D. B. Judd, D. L. MacAdam, and G. Wyszecki, J. Opt. Soc. Soc. Am. 54, 1031 (1964).
  5. D. L. MacAdam, J. Opt. Soc. Am. 28, 103 (1938).
  6. B. T. Barnes, J. Opt. Soc. Am. 47, 1124 (1957).
  7. W. A. Thornton, J. Opt. Soc. Am. 61, 1155 (1971).
  8. W. T. Wintringham, Proc. IRE 39, 1135 (1951).
  9. It is not unexpected that the locus shows an evolutionary extension toward the three spectral colors of maximum brightness (450, 540, 610 nm).

Barnes, B. T.

B. T. Barnes, J. Opt. Soc. Am. 47, 1124 (1957).

Judd, D. B.

D. B. Judd, D. L. MacAdam, and G. Wyszecki, J. Opt. Soc. Soc. Am. 54, 1031 (1964).

MacAdam, D. L.

D. B. Judd, D. L. MacAdam, and G. Wyszecki, J. Opt. Soc. Soc. Am. 54, 1031 (1964).

D. L. MacAdam, Appl. Opt. 10, 1 (1971).

D. L. MacAdam, J. Opt. Soc. Am. 28, 103 (1938).

Thornton, W. A.

W. A. Thornton, J. Opt. Soc. Am. 61, 1155 (1971).

Wintringham, W. T.

W. T. Wintringham, Proc. IRE 39, 1135 (1951).

Wyszecki, G.

D. B. Judd, D. L. MacAdam, and G. Wyszecki, J. Opt. Soc. Soc. Am. 54, 1031 (1964).

Other (9)

If color space is likened to a pudding, and the perceived chromaticity-lightness coordinates of the many object colors in a scene are the plums, we define the illuminant with the highest color-discrimination capability as that one which leads to maximum mean interplum distance.

D. L. MacAdam, Appl. Opt. 10, 1 (1971).

IES Subcommittee on Color Rendering, Illum. Engr. 57, 471 (1962); Commission Intern, de l'Eclairage (CIE), Publ. CIE No. 13 (E-1.3.2) (Bureau Central de la CIE, 57 rue Cuvier, Paris, France, 1965).

D. B. Judd, D. L. MacAdam, and G. Wyszecki, J. Opt. Soc. Soc. Am. 54, 1031 (1964).

D. L. MacAdam, J. Opt. Soc. Am. 28, 103 (1938).

B. T. Barnes, J. Opt. Soc. Am. 47, 1124 (1957).

W. A. Thornton, J. Opt. Soc. Am. 61, 1155 (1971).

W. T. Wintringham, Proc. IRE 39, 1135 (1951).

It is not unexpected that the locus shows an evolutionary extension toward the three spectral colors of maximum brightness (450, 540, 610 nm).

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