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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 59, Iss. 5 — May. 1, 1969
  • pp: 628–632

Chromatic Strength of Colors, III. Chromatic Surrounds and Discussion

RALPH M. EVANS and BONNIE K. SWENHOLT  »View Author Affiliations

JOSA, Vol. 59, Issue 5, pp. 628-632 (1969)

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The relative luminance of a color at the threshold between gray content and apparent fluorescence (fluorence) is not much affected by the luminance of the surround but is greatly affected by its chromaticity. The results indicate that the continuum of color perceptions of a color stimulus seen against a variety of backgrounds is four dimensional. A new concept, “specific hue brilliance,” is shown to describe both the relationship of gray content to the purity of a color of a given dominant wavelength and the appearance of high-purity colors at constant luminance.

RALPH M. EVANS and BONNIE K. SWENHOLT, "Chromatic Strength of Colors, III. Chromatic Surrounds and Discussion," J. Opt. Soc. Am. 59, 628-632 (1969)

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  1. R. M. Evans and B. K. Swenholt, J. Opt. Soc. Am. 57, 1319 (1967).
  2. R. M. Evans and B. K. Swenholt, J. Opt. Soc. Am. 58, 580 (1968).
  3. Since no reference white is available in these situations, we have referred to the filters by nominal wavelength. Actually, the values plotted are λD for our 7000 K surround. At high purity, the reference white makes little difference.
  4. R. M. Evans, J. Opt. Soc. Am. 49, 1049 (1959).
  5. D. B. Judd, J. Opt. Soc. Am. 25, 24 (1935).
  6. D. Jameson and L. M. Hurvich, J. Opt. Soc. Am. 45, 546 (1955).
  7. D. L. MacAdam, J. Opt. Soc. Am. 28, 103 (1938). MacAdam defines moment as the product of the distance from the chromaticity of the color to the chromaticity of the white point times the mass of the color where mass is Y divided by y; i.e., mass is equal to X + Y + Z.
  8. It is well known that, at high purity, relative luminance does not describe lightness exactly. However, it has been a generally observed fact in all of this work that colors of lower relative luminance at G0 have looked darker than those of higher relative luminance.
  9. R. M. Evans, J. Opt. Soc. Am. 57, 279 (1967).
  10. It is not known whether this brilliance depends on perceived hue or on wavelength. We have used the words hue and brilliance because specific-wavelength brightness could be confused so easily with relative luminous efficiency.

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