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712 COLOR SENSITOMETRY June
turing establishment than a processing laboratory. For the latter, the use of equivalent neutral densities will be justified if their plot gives a clearer picture than the integral density plot of the effects of the processing variables that can be adjusted. The decision must be based on experience with a particular process. Once the choice has been made it is not easily changed, because the interpretive experience gathered by the sensitometric staff cannot be transferred.
Non-Gray Exposures
The importance of supplementing the usual gray scale sensitometry with the study of non-gray exposures has already been stressed. To determine the fidelity of reproduction of chromatic exposures (filters in the sensitometer, or test charts before the camera), visual judgments may be supplemented by colorimetric comparisons. It must be borne in mind that the accurate reproduction of highly saturated colors is beyond the capability of current three-layer subtractive processes. Standard methods for the interpretation of colored sensitometric images have not been formulated. In most laboratories, reference color densities for non-gray test patch images will be empirically established, and the actual densities obtained during process adjustment will be evaluated with respect to these reference densities.
Evaluation for Printing
In professional motion picture practice, the essential features of a camera original are contained in its printing densities. Printing densities describe how the original record of the scene will control the next step of the photographic process. This next step will be the printing either of the final positive or of an intermediate film. In either case the camera original is essentially only a means by which the point-to-point exposure made in the camera by the scene image can control the point-to-point exposures of the final positive print.
In considering evaluation for viewing, it was pointed out that "if the camera original has certain systematic defects, the print process will be adjusted, wherever possible, to compensate for them." It is equally true that whatever the systematic characteristics of the print material, the camera original or printing operation must be adjusted to best utilize them. In either event, essential knowledge can be derived from characteristic curves of the camera original material, plotted in printing densities.