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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 25, Iss. 1 — Jan. 1, 1935
  • pp: 24–35

A Maxwell Triangle Yielding Uniform Chromaticity Scales

DEANE B. JUDD  »View Author Affiliations


JOSA, Vol. 25, Issue 1, pp. 24-35 (1935)
http://dx.doi.org/10.1364/JOSA.25.000024


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Abstract

A calorimetric coordinate system has been found by trial and error whose Maxwell triangle has the useful property that the length of any line on it is a close measure of the chromaticity difference between the stimuli represented at the extremes of the line. Such accurate chromaticity scales may be derived from this triangle merely by stepping off equal intervals on it that it has been called the “uniform-scale triangle.” The definition of the system is given, and also a comparison of experimental sensibility data with corresponding data derived from the triangle. An important application of this coordinate system is its use in finding from any series of colors the one most resembling a neighboring color of the same brilliance, for example, the finding of the nearest color temperature for a neighboring non-Planckian stimulus.draw the shortest line from the point representing the non-Planckian stimulus to the Planckian locus.

Citation
DEANE B. JUDD, "A Maxwell Triangle Yielding Uniform Chromaticity Scales," J. Opt. Soc. Am. 25, 24-35 (1935)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-25-1-24


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References

  1. D. B. Judd, Chromaticity Sensibility to Stimulus Differences, J. Opt. Soc. Am. 22, 72 (1932).
  2. Judd, J. Opt. Soc. Am. 22, 87 (1932).
  3. Proc. 8th Session, International Commission on Illumination, Cambridge, pp. 19–29, September, 1931. D. B Judd, The 1931 I. C. I. Standard Observer and Coordinate System for Colorimetry, J. Opt. Soc. Am. 23, 359 (1933). T. Smith and J. Guild, The C. I. E. Colorimetric Standards and Their Use, Trans. Opt. Soc. 33, 73 (1931–32).
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  31. J. Opt. Soc. Am. 23, 35 (1933).
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  36. Report of Color Committee of the American Oil Chemists' Society, Year 1932–1933, Oil and Soap 10, 114 (1933).
  37. In this instrument no provision at all is made for equalizing the brightnesses of the two fields; hence, the problem, strictly a tridimensional one, is reduced to a single specification by neglecting both small chromaticity and small brilliance differences.
  38. R. Davis, A Correlated Color Temperature for Illuminants, Bur. Standards J. Research 7, 659 (1931); RP365.
  39. Note distinction from x¯ and y¯ of relation (3).

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