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MAKING A FADEOUT BY AFTER TREATMENT
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of bathing, as shown by the curve in Figure 5. In order to obtain, on each frame, a density which is directly proportional to the distance from the end of the fade it was necessary to vary the time of treatment throughout the length of the fade in a manner which is functionally related to the exponential rate of growth of density with time of treatment. A fadeout of this type, the curve of which is shown at A in Figure 6, was made by timing the dye treatment according to the indications of the curve in Figure 5, to give a constant rate of increase in density along the length.
DYE TINTING OF MOTION PICTURE.
POSITIVE. FILM.
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TIME (»K.)
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OYE TINTING OP" MOTION PiCTURC POSITIVE F"II_M
A-AOOGO OENSlTV PROPORTiONM TO
OliTANCE FROM CND OF" FftOE-OOT a-Tir-AC 0«=" TRCftTMENT PROPORTIONS TO OlIiT^NCE FROM CNO OF r/\Ot-OU' C TIMING BY «=,lMP*l_e. CRANK AND CONNECTING ROO MECHANISM.
Curve B in Figure 6 shows the densities produced by leading the film at a constant rate into the dye solution, a procedure which, as might be expected, gives very poor results.
Curve C in Figure 6 shows the densities which resulted from times of treatment which could be given by a simple crank and connecting rod mechanism. This fade-out was found quite satisfactory.
Methods of Handling the Film When Making Fades.
Of the numerous ways of causing a varying degree of chemical treatment from one end of the fade to the other, the simplest is to Vary the time of treatment.