Process and device for copying photographic color images

Details Process and device for copying photographic color images Process and device for copying photographic color images

1976-02-11

1977-09-27

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Multicolor picture

96 11, 350315, 350316, 355 71, 355 77, G03B 2732, G03B 2752

Patent

active

040508072

ABSTRACT:
A blocking filter is used, in conjunction with the substractive filter method of copying photographic color images, to remove or substantially remove by greatly weakening wave lengths from the copying light in the range in which the filter characteristics of the blue and green color filters or the spectral sensitivity curves of photographic copying paper overlap each other, or more particularly in a 30 nm belt about a central wave length of approximately 500 nm.

REFERENCES:
patent: 3324764 (1967-06-01), Altman
patent: 3754823 (1973-08-01), Weisglass et al.
patent: 3829210 (1974-08-01), Langer et al.

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