Exposure and contrast determination by prescanning in electronic

Details Exposure and contrast determination by prescanning in electronic Exposure and contrast determination by prescanning in electronic

1981-06-05

1982-08-17

Gellner, Michael L.

Photocopying

Projection printing and copying cameras

With cathode ray tube for light source

355 68, 355 71, 355 81, 355 83, G03B 2716, G03B 2780

Patent

active

043446990

ABSTRACT:
Automatic control of exposure level and contrast correction for a photographic printer is disclosed. The printer uses dynamic masking achieved by modulating the intensity and velocity of a CRT scanning spot. A prescan is employed to evaluate the negative and establish exposure level and contrast grade excursion limits for the subsequent exposure. Different control systems are disclosed for contact printing and projection printing.

REFERENCES:
patent: 4265532 (1981-05-01), McIntosh

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