An extension of the Riggs projection colorimeter

  • Gerald M. Murch
  • James Paulson
Instrumentation & Techniques


A method for the construction and calculation of CIE chromaticity coordinates from a simple and inexpensive projection colorimeter is presented. The device allows variation along the dimensions of hue, saturation, and brightness and specification of these variations in terms of chromaticity coordinates, dominant wavelength, relative luminance, and excitation purity.


Beam Splitter Spectral Sensitivity Color Temperature Spectral Energy Distribution Color Match 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. Murch, G. M. CIE x,y coordinates from an inexpensive projection colorimeter. Behavior Research Methods & Instrumentation. 1972, 4, 3–5.Google Scholar
  2. Riggs, L. A. A projection color mixer. American Journal of Psychology, 1964, 77, 129–134.CrossRefPubMedGoogle Scholar
  3. Wyszecki, G., & Stiles, W. S.Color science. New York: Wiley, 1967.Google Scholar

Copyright information

© Psychonomic Society, Inc. 1974

Authors and Affiliations

  • Gerald M. Murch
    • 1
  • James Paulson
    • 1
  1. 1.Portland State UniversityPortland

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