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WESTERN ELECTRIC SYSTEM
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the positive of the contrasts of the negative exposure can be had only if we arrange to confine the exposures on both the negative and print to the straight line portion, and furthermore arrange the development of both films so that the contrasts are reciprocal.
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RELATIVE LOG E
FIGURE 5
2.0
It can be demonstrated that if the exposures are restricted to the correct exposure regions, and if the gammas of development are made to have reciprocal values, the variations in the negative exposure are properly reproduced as variations of positive transmission.
It is to be emphasized that the photographic problem of sound differs from that of the picture. The sound record requires exact contrast reproduction, whereas the picture may call for an enhancement of the brightness values of the scene photographed. For this reason it is an advantage to make sound and picture negatives on separate films. The picture negative can then be developed as desired and the sound negative can be given the treatment which insures a negative gamma the reciprocal of that of the release print development.
Then it must be pointed out that the ordinary methods of