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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 45, Iss. 7 — Jul. 1, 1955
  • pp: 539–541

Subtractive Color Reproduction: Evaluation of the Actual Color-Reproduction Equations for a Color Process

W. R. J. BROWN  »View Author Affiliations


JOSA, Vol. 45, Issue 7, pp. 539-541 (1955)
http://dx.doi.org/10.1364/JOSA.45.000539


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Abstract

The requirements for a photographic system to reproduce the chromaticities of selected colors can be described by a set of equations. These equations relate the amounts of dye needed in the reproduction to the exposure densities of the original colors. These equations have been called color-reproduction equations by Brewer, Hanson, and Horton. These color-reproduction equations have been computed for a negative-positive color system.

The equations state the requirements placed on a color system if it is to reproduce the chromaticities of the original. A similar set of color-reproduction equations can be computed which describe the actual performance of the color system. These actual color-reproduction equations are established by measuring the actual amount of dye produced in a process when reproducing a color chart. These amounts of dye are related to the exposure densities of the original colors. The required and actual color-reproduction equations for a negative-positive color system are compared. The similarity between these sets of equations show how well a modern negative-positive color system fulfills conditions of good color reproduction.

Citation
W. R. J. BROWN, "Subtractive Color Reproduction: Evaluation of the Actual Color-Reproduction Equations for a Color Process," J. Opt. Soc. Am. 45, 539-541 (1955)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-45-7-539


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References

  1. Evans, Hanson, and Brewer, Principles of Color Photography (John Wiley and Sons, Inc., New York, 1953), p. 429.
  2. Brewer, Hanson, and Horton, J. Opt. Soc. Am. 39, 924–927 (1949).
  3. K. Meyer and H. Ulbricht, Z. wiss. Phot. 46, 72 (1951).
  4. W. Behrendt, Z. Naturforsch. 6a, 382 (1951).
  5. W. T. Hanson, Jr., and C. A. Horton, J. Opt. Soc. Am. 42, 663–669 (1952).
  6. W. T. Hanson, Jr., J. Opt. Soc. Am. 40, 166–171 (1950).
  7. Null, Lozier, and Joy, J. Soc. Motion Picture Engrs. 38, 221 (1942).

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