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JENNINGS, STANTON AND WEISS
November
Fig. 4. Wedge spectrogram showing sensitivity peaks of magenta, yellow and cyan
layers.
PHOTOGRAPHIC CHARACTERISTICS
Since this film is designed for printing from color separation records, it is possible to have a layer arrangement and sensitivity as shown without regard to the kind of light originally required to make the
various records. This is explained in Fig. 3. The arrangement chosen has been adopted in the interest of resolution (sharpness) with the various images positioned in order of importance, namely, the greenrecord image in magenta on top, the cyan (red-record) image next and the yellow (blue-record) last. A wedge spectrogram showing the spectral response of the complete film is shown in Fig. 4. This shows peaks at 440, 550, and 710 mju (millimicrons) for the magenta, yellow and cyan layers, respectively. The peak at 440 mju in the magenta layer is produced
0 1.0 20
RELATIVE LOG EXPOSURE
Fig. 5. Sensitometric curves for individual layers and neutral scale.
by the instrument used, the peak for the silver halide used actually being at about 390 mju.
Photographic characteristics have been adjusted to permit printing from color analysis records having equal effective contrasts. The sensitometric curves of the various layers for a standard set of developing conditions using the developing agent p-aminodiethylaniline are shown in Fig. 5, with densities measured at the wavelength of maximum absorption of each dye. A similar set of curves was selected as a goal of the work by calculations made from a neutral sensitometric curve of desired characteristics (gamma = 2.5, straightline densities to 2.8) and the absorption characteristics of the dyes from the color-forming binders selected for use. The absorption curves of