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 u, v 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.

© 1972 Optical Society of America

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References

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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).
    [Crossref] [PubMed]
  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).
    [Crossref]
  5. D. L. MacAdam, J. Opt. Soc. Am. 28, 103 (1938).
    [Crossref]
  6. B. T. Barnes, J. Opt. Soc. Am. 47, 1124 (1957).
    [Crossref]
  7. W. A. Thornton, J. Opt. Soc. Am. 61, 1155 (1971).
    [Crossref] [PubMed]
  8. W. T. Wintringham, Proc. IRE 39, 1135 (1951).
    [Crossref]
  9. It is not unexpected that the locus shows an evolutionary extension toward the three spectral colors of maximum brightness (450, 540, 610 nm).

1971 (2)

1964 (1)

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

1962 (1)

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).

1957 (1)

1951 (1)

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

1938 (1)

Barnes, B. T.

Judd, D. B.

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

MacAdam, D. L.

D. L. MacAdam, Appl. Opt. 10, 1 (1971).
[Crossref] [PubMed]

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

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

Thornton, W. A.

Wintringham, W. T.

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

Wyszecki, G.

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

Appl. Opt. (1)

Illum. Engr. (1)

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).

J. Opt. Soc. Am. (3)

J. Opt. Soc. Soc. Am. (1)

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

Proc. IRE (1)

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

Other (2)

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

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.

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Figures (6)

Fig. 1
Fig. 1

Gamut areas of six illuminants in the 1960 CIE u,v chromaticity diagram, as defined by the chromaticities of eight test colors. Solid curves: daylight at ∞ and 6500 K correlated color temperatures. Dashed curves: planckian radiators at 4000, 3000, 2000, 1000 K. Fine line: boundary of real colors.

Fig. 2
Fig. 2

Gamut areas of five commercial vapor lamps with color-rendering capability increasing from A to E as evaluated subjectively over many years.

Fig. 3
Fig. 3

Gamut areas of daylight (illuminant C, solid curve) and of white light of the same color composed of spectral colors 450, 540, 610 nm (dashed curve). Arrows: direction of the spectral colors.

Fig. 4
Fig. 4

Spectral power distribution (SPD) of an actual fluorescent lamp of chromaticity the same as that of the equal-energy spectrum.

Fig. 5
Fig. 5

Gamut areas of the equal-energy spectrum (dotted) and of the experimental fluorescent lamp of Fig. 4.

Fig. 6
Fig. 6

Locus of extreme purities of pigments, dyes, and inks [from Wintringham (Ref. 8)] under illuminant C illumination. Chromaticities of the eight test colors under illuminant C are also shown.

Tables (1)

Tables Icon

Table I Gamut areas and color-rendering indices for various illuminants.