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DETERMINATION OF FILM CHARACTERISTIC CURVES FROM DENSITY HISTOGRAMS

A method for producing the film characteristic curve from exposures of the same image field with varying exposure times is developed, using the film density histogram distributions of the individual exposures. This method is appropriate for cases where a standard step wedge or other sensitometric calibration is not available, and where film reciprocity can be assumed for the exposure times used. The method is very general and incorporates as much of the film density information as the user desires.