GelFind is a DOS (non Windows) program which will locate five colors which should be a "close match" to any gel listed in the two data files, GEL_72.LST and GEL_81.LST. For example, if a show from 1954 was designed with colors from the Brigham® and Cinemoid® line, a closely matching substitute gel from the Lee®, Roscolene® or Roscolux® line can be found.
The two data files included with the program, list the x and y color coefficients for the Brigham®, Cinemoid®, Roscolene®, Roscolux®, Lee® and Gelatran® gel lines. The coordinates listed in GEL_72.LST were originally published in the Fall 1972 issue of Theatre Design and Technology (Batcheller: "A Colormetric Study of Stage Lighting Filters"). Those coefficients included in GEL_81.LST were published in Warfel and Klappert's Color Science for Lighting the Stage (1981). The coordinates for the Brigham line listed in GEL_81.LST are from Batcheller (1972).
The search routine uses the computed distance between the gel colors as plotted on a chromaticity plot. For a more thorough analysis of color coefficients and chromaticity plots read Chapter 2: "Colorimetry" in Warfel and Klappert (1981).
Batcheller, David R. "A Colormetric Study of Stage Lighting Filters." Theatre Design and Technology. No. 30 (October 1972) pages (14-22).
Warfel, William B. and Walter R. Klappertbe. Color Science for Lighting the Stage. New Haven, CN:Yale University Press. 1981.
Read the... GelFind 2003 Documentation
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