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1950 INTERPRETING RESULTS 717
posed negatives, representing other scenes and possibly other negative materials.
Where direct photometric measurements are unobtainable, printer control can be exercised by comparisons of prints resulting from printer exposures made through a standard sensitometric-scale negative with prints, simultaneously processed, resulting from sensitometer exposures; that is, the printer is controlled by reference to an unchanging sensitometer, using the print material as the comparison medium. Ideally, this comparison should be made by use of analytical densities of the resulting prints, but the comparison should be made using images so nearly identical that any three-filter densitometry should suffice.
The effects of change of print film stock can be evaluated in several ways; analytical densities, preferably equivalent neutral densities, give the information most directly related to the changes in printer adjustments which can be made to minimize the differences. The analytical density curves permit the direct determination, with reasonably good accuracy of the required changes in the individual layer exposures. If the printer adjustments cannot change these exposures individually, it is possible to set up a quantitative calibration by a procedure similar to the transformation of integral to analytical densities.
Sound Track Evaluation
The evaluation of sensitometric tests for sound records on color film follows the same principles that have been considered for picture records, although the actual procedures are different. The quality judgments that are obtained for the picture area by screen viewing and by colorimetric measurements have their sound track counterparts in listening tests and in electrical measurements.26 The adjustment of sound track printing and processing is governed by tests of sound quality (e.g., measurements of signal-to-noise ratio and intermodulation tests). Until the conditions for optimum reproduction have been established, sensitometric procedures are restricted to a secondary role. Once the optimum conditions are known, they can be correlated with sensitometric measurements which may then become the primary means of control. At that stage, the problem of interpretation becomes one of comparing the sensitometric characteristics of a given test with reference data.