27 April 1995 Digitization of film for archiving through the estimation of dye densities
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Abstract
This paper introduces an alternate standard for film archiving based on digitizing the dye densities of the film rather than the color (XYZ or RGB). The color of the film is encoded by the storage of two types of information: (1) the analytical densities of the dyes, which must only be stored once for each film; and (2) the dye concentrations for each pixel of each frame. If the analytical densities of the dyes are known, then the concentration of each dye can be estimated by measuring the logarithm of the transmission of the film in as few as three frequency bands. A formalism for accomplishing this estimation, as well as the estimation of the dye density curves, will be presented. The error of this digitization technique as a function of filter bandwidth and a function of the number of spectra transmission measurements used for the dye concentration estimation will be quantified. In addition, the impact of this technique for film restoration will be discussed.
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Lon N. Pringle, Thomas P. McElwain, Bruce B. Glasgow, "Digitization of film for archiving through the estimation of dye densities", Proc. SPIE 2413, Color Hard Copy and Graphic Arts IV, (27 April 1995); doi: 10.1117/12.207597; https://doi.org/10.1117/12.207597
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