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High image quality and low radiation levels are essential in mammography. This study investigates the effect of changes in processor temperatures and developing times on sensitometric findings. These findings were matched with the changes in the image quality during similar changes in the developing parameters. Temperatures ranging between 35°C and 40°C and developing times from 20 s and 50 s were investigated. Higher developing temperatures and increased developing times resulted in an increase in film speed and film contrast. A definite pattern of change could be demonstrated in film speed and film contrast during sensitometry. The same pattern of change could, however, not be demonstrated in the quality of phantom images under similar circumstances. The base plus fog level was not adversely affected. Sensitometric findings of film speed can be effectively used as an indicator of radiation exposure to the patient, but cannot be used to establish the developing parameters that will give the best image quality. Both these methods should be used to determine which processing variables should be used to obtain a combination of the best image with radiation as low as possible. Recommendations for optimum processing parameters are made for the films and processing chemistry investigated.