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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 28, Iss. 10 — Oct. 1, 1938
  • pp: 390–396

Designation of Filters for Theatrical Lighting

DEANE B. JUDD  »View Author Affiliations

JOSA, Vol. 28, Issue 10, pp. 390-396 (1938)

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The basis of this proposal is that the complete definition of the chromatic properties of filters used in illumination is transmission as a function of wave-length; an approximate definition suitable for commercial specification should, therefore, take the form of an abbreviated notation for the curve of spectral transmission. It is proposed to specify filters for theatrical lighting by a seven-digit number, the first digit of which refers to spectral transmission at the short wave extreme of the spectrum, the second, that at some longer wave portion, and so on throughout to the long wave extreme. The present paper discusses choices of wave-lengths to which the digits should refer and also what range of transmission should be indicated by digit, 0, what by digit, 1, what by digit, 2, and so on for maximum usefulness of the specification. Recommended choices are presented based upon a spectro-photometric examination by William F. Little and Allan E. Parker of the Electrical Testing Laboratories made upon two groups of theatrical gelatines, one group of 11 pink filters and one group of 11 blue filters.

DEANE B. JUDD, "Designation of Filters for Theatrical Lighting," J. Opt. Soc. Am. 28, 390-396 (1938)

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  1. The proposal is stated in Appendix E to the minutes of the 1937 Annual Meeting; the discussion is summarized in the minutes.
  2. H. Helson and D. B. Judd, "A Study of Photopic Adaptation," J. Exp. Psychology 15, 380 (1932); D. B. Judd, "Surface Color," J. Opt. Soc. Am. 25, 44 (1935); H. Helson and D. B. Judd, "An Experimental and Theoretical Study of Changes in Surface Colors under Changing Illuminations," Psych. Bull. 33, 740 (1936); H. Helson, "Tri-Dimensional Analysis and the Non-Film Modes of Color Appearance," J. Opt. Soc. Am. 27, 59 (1937).
  3. Following attention drawn by Gibson and Keegan (J. Opt. Soc. Am. 28, 180 (1938)) to the inapplicability to fluorescent samples of spectrophotometers which, like the General Electric instrument, do not disperse the light after it leaves the sample, it was discovered that the Deep Pink No. 8 filter was definitely more fluorescent than the Pink No. 5 filter. The curves in Fig. 3, therefore, fail to show quite fairly the transmission differences between the two filters. However, the error is not sufficient to change the proposed ISCC designation for either.

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