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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 52, Iss. 7 — Jul. 1, 1962
  • pp: 813–816

Ideal Lovibond Color System

DEANE B. JUDD, G. J. CHAMBERLIN, and GERALDINE W. HAUPT  »View Author Affiliations


JOSA, Vol. 52, Issue 7, pp. 813-816 (1962)
http://dx.doi.org/10.1364/JOSA.52.000813


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Abstract

Lovibond red, yellow, and blue glasses, widely used as color standards in industry, are assigned numerals in accord with the basic plan of marking each glass with the number of unit glasses of the same type through which light must be passed to produce its color. It is possible to compute from the spectral transmittances of the unit glasses defining the Lovibond scales the CIE specification of the color produced by all combinations of any number of unit glasses. Such specifications were computed in 1939 not only for all ideal red, yellow, and blue Lovibond glasses illuminated by CIE sources B (representing noon sunlight) or C (representing average daylight) but also for two-part (red-yellow, yellow-blue, or blue-red) combinations thereof. The present paper gives the results of such computations for CIE source A (representing gas-filled incandescent lamps). Although actual Lovibond glasses must unavoidably depart somewhat from this definition of the ideal Lovibond system, the computed color specifications serve to indicate with good reliability not only the CIE specification of the color produced by single glasses and two-part combinations, but also the choice of Lovibond glasses required to produce a color of any desired chromaticity within the gamut of the system.

Citation
DEANE B. JUDD, G. J. CHAMBERLIN, and GERALDINE W. HAUPT, "Ideal Lovibond Color System," J. Opt. Soc. Am. 52, 813-816 (1962)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-52-7-813

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