Photographic contrast enhancement system using photochromic glas

Details Photographic contrast enhancement system using photochromic glas Photographic contrast enhancement system using photochromic glas

1975-03-12

1977-05-24

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

G03B 2776

Patent

active

040251918

ABSTRACT:
A method and system for processing a photographic negative to obtain photographic prints exhibiting enhanced contrast therefrom are described. A sheet of darkened optically bleachable photochromic glass, positioned between the negative and a selected photographic printing medium, is selectively bleached by light passing through the negative to form an image of the negative in the glass. Light of a wavelength effective to activate the photographic printing medium is then passed through the photographic negative and selectively bleached photochromic glass and focused to provide an enhanced contrast image of the photographic negative on the printing medium. A photographic print of enhanced contrast is thus produced.

REFERENCES:
patent: 3252374 (1966-05-01), Stookey
patent: 3598471 (1971-08-01), Baldwin et al.
patent: 3661461 (1972-05-01), Dessauer
patent: 3680956 (1972-08-01), Custer
patent: 3734598 (1973-05-01), Aiken

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