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706 COLOR SENSITOMETRY 'June
this aim. The first stage will be called adjustment, and the second control.
Adjustment of the process normally calls for evaluation as discussed in Section I. It will be the function of color sensitometry to provide an objective description of process performance. This calls for interpretation of the results in terms of the application for which the film is intended. If the film is a positive intended for screen viewing, the sensitometric results must be interpreted in terms of visual appearance; if, on the other hand, the film is a camera original or an intermediate negative or positive, the evaluation must be made in terms of printing characteristics.
Evaluation for Viewing
A print process yielding positives for screen projection will generally be adjusted by considering the over-all quality of the reproduction. The objective will be to produce a pleasing likeness of the original scene; if the camera original has certain systematic defects, the print process will be adjusted, wherever possible, to compensate for them. Subjective quality judgments of representative scenes will be an essential factor in this adjustment; the corresponding sensitometric data will show final print densities as functions of exposure of the camera original. For this purpose, a camera film carrying a sensitometric image will be printed on the print film by the normal printing procedure.
Such "over-all" reproduction data are the primary measurements in adjustment. They are often supplemented by direct print film sensitometry, in which print densities are studied as a function of print exposure, independent of the camera film. These separate measurements on the print process can be made with somewhat higher precision than the over-all measurements. In some cases, the aim point for the adjustment of a print process is already known in terms of direct print sensitometry; the actual adjustment can then be made by print sensitometry without recourse to over-all measurements or picture quality judgments. In other cases, clues to specific print process changes may be more apparent in direct print sensitometry than in over-all measurements. But wherever the aim point is in question it is sound procedure to return to the primary method of evaluating, by measurement and by subjective judgment, the over-all quality of the reproduction.