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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 48, Iss. 6 — Jun. 1, 1958
  • pp: 389–391

L/Y Ratios in Terms of CIE-Chromaticity Coordinates

C. L. SANDERS and G. WYSZECKI  »View Author Affiliations


JOSA, Vol. 48, Issue 6, pp. 389-391 (1958)
http://dx.doi.org/10.1364/JOSA.48.000389


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Abstract

In previous papers a correlate for lightness (L) was found in terms of CIE-tristimulus values for colors of approximately constant luminous reflectance (Y). L could be expressed by a second degree equation with X, Y, Z as variables. In the present study about 100 samples were selected to cover the gamut of existing surface colors. The lightness-equivalent neutrals were estimated by three observers for these colors under the same conditions as described in a previous paper. The original type of equation could not be used to fit the observational data because of the large differences in luminous reflectance among the samples. However, the L/Y ratios could be expressed by a second degree equation with chromaticity coordinates x, y as variables. This type of equation appears to be valid for all reflecting surface colors.

Citation
C. L. SANDERS and G. WYSZECKI, "L/Y Ratios in Terms of CIE-Chromaticity Coordinates," J. Opt. Soc. Am. 48, 389-391 (1958)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-48-6-389


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References

  1. C. L. Sanders and G. Wyszecki, J. Opt. Soc. Am. 47, 398 (1957).
  2. G. Wyszecki and C. L. Sanders, J. Opt. Soc. Am. 47, 840 (1957).
  3. R. B. Bedford and G. Wyszecki, J. Opt. Soc. Am. (to be published).

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