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VII. INTERPRETATION OF SENSITOMETRIC RESULTS
The primary results of the ordinary procedures of color sensitometry are sets of color density values that describe the images produced by known exposures. These color densities vary with changes in film, with processing changes, and with many other factors which must be evaluated and controlled in the practice of color photography. The interpretation of the results in terms of these many factors is the final step in color sensitometry.
This step, like all interpretation of technical data, will be governed by the specific purpose at hand. In research and development work leading to new materials and processes, the results of sensitometry are used in studying the effects of manufacturing and processing changes on fundamental characteristics such as speed, gradation, latitude, color reproduction and keeping properties. The present report will not attempt to deal with this wide range of problems which are of interest to only a small group of research and manufacturing establishments.
In the domain of the motion picture laboratory, the range of problems is narrower, but the role of color sensitometry is no less important. The adjustment and control of processing and printing operations require long-range as well as day-to-day decisions which must be based on the results of sensitometric tests. These are the purposes with which the present discussion of data interpretation will be primarily concerned.
Since this subject involves purposes as well as facts, it is inherently more controversial than the material in previous sections. The principles here discussed are tentative; their validity can be established only as more experience accumulates in this relatively young field.
Process Adjustment
Successful operation of a color film process is usually accomplished in two stages. In the initial period of operation, the process is intentionally changed after each trial run until the results are judged satisfactory. Once the aim point has been established, 4he objective will be to produce results repeatedly with minimum departure from
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