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SENSITOMETRY
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soft, more precisely to match up with the sound quality, were being obtained. It is safe to assume that at the present time the motion picture producing companies are working at positive gammas varying within the range of 1.80 to 2.00. There are, of course, individual units working low, with other individual units working high, but the average of all would not be far from positive gammas of 1.90.
A sensitometric study for positive gamma determinations and for studies of positive developers are carried out in a manner identical
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Fig. 5
to that described under the section of "Development of Picture Negative."
As regards positive developers, the condition of formulas is relatively unchanged, each laboratory works on a positive formula which satisfies the requirements of the producers by whom they are employed. Naturally, the chemicals used are quite generally the same but the proportions, the number of chemical elements, and even the choice of chemical elements, is not nearly as uniform between the various laboratories as it is in the case of the negative developers. It is possible to produce positive prints at a given gamma value in two differently constituted developers which will look quite different on the screen. However, it is always necessary to take into consideration the negative quality and the positive resulting from that negative to satisfy the requirements of the producing units.