Dynamic exposure level control of crt light source

Details Dynamic exposure level control of crt light source Dynamic exposure level control of crt light source

B - Operations, Transporting

41

B

314/43.6

B41B 19/01 (2006.01) G03B 27/80 (2006.01)

Patent

CA 1207373

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.

445041

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