Halftone photographic method and apparatus

Details Halftone photographic method and apparatus Halftone photographic method and apparatus

1979-08-14

1981-06-30

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 77, G03B 2772, G03B 2732

Patent

active

042759617

ABSTRACT:
A supplemental flash exposure is made of a halftone negative in a process camera for making halftones. Before making the flash exposure, a reflector card is placed on the copyboard holding the original continuous tone copy, the reflector card having a gray scale value of between about 45% and about 80% of the shadow density of the original copy. The reflector card controls the flash exposure, so that dots formed during the main exposure in the highlight and middletone areas of the original copy are not affected, but dot formation in the shadow areas is enhanced. The result is a haze free reproduction with sharp definition and contrast.

REFERENCES:
patent: 3249000 (1966-05-01), Pack
patent: 3335636 (1967-08-01), Atkinson
patent: 3506350 (1970-04-01), Denner
patent: 3597077 (1971-08-01), Dorn
patent: 4080055 (1978-03-01), Gary
patent: 4087180 (1978-05-01), DiNatale
patent: 4135813 (1979-01-01), Frank et al.

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