| 摘要 |
A photographic printer includes light sensors for measuring optical characteristics of photographic film to be printed. Prior to printing, the output signals of the light sensors are monitored under one or more reference condition, and calibration values based upon this monitoring are derived and stored. During normal operation of the photographic printer the sensors provide measurements of the optical characteristics of the film, and the output signals of the light sensors are calibrated based upon the stored calibration values. The exposures are then controlled as a function of the corrected output signals.
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