Photographic printer with automatic sensor calibration

Details Photographic printer with automatic sensor calibration Photographic printer with automatic sensor calibration

1977-12-21

1979-10-30

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 77, 355 83, G03B 2778

Patent

active

041726596

ABSTRACT:
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.

REFERENCES:
patent: 3506352 (1970-04-01), Denner
patent: 3696331 (1972-02-01), Lord
patent: 3873201 (1975-03-01), Amano
patent: 3891317 (1975-06-01), Walker
patent: 3986776 (1976-10-01), George
patent: 4079257 (1978-03-01), Jatteau et al.

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