Shading correcting apparatus for photographic printer

Details Shading correcting apparatus for photographic printer Shading correcting apparatus for photographic printer

1988-07-13

1989-10-17

Hix, L. T.

Photocopying

Projection printing and copying cameras

With cathode ray tube for light source

355 40, G03B 2772

Patent

active

048750719

ABSTRACT:
A shading correcting apparatus for a photographic printer having a plurality of interchangeable printing lenses and a CRT for illuminating a photographic film to print an image of the photographic film on a photographic material is provided with a first memory in which memorized are data on illumination patterns prepared one individual to each of the interchangeable printing lenses and a second memory for memorizing data which eliminate shading of taking lens and flash light. The shading correcting apparatus is further provided with first and second selecting means for selecting the data of one of the illumination patterns according to a selected printing lens and a taking lens or a flash light. The CRT is controlled by the selected data to make an illumination pattern suitable for correcting shading occurred due to the printing lens used.

REFERENCES:
patent: 3772465 (1973-11-01), Vlahos et al.
patent: 4172640 (1979-10-01), Land
patent: 4344699 (1982-08-01), McIntosh
patent: 4690546 (1987-09-01), Kuzyk et al.

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