Photographic masks for tonal correction

Details Photographic masks for tonal correction Photographic masks for tonal correction

1987-03-31

1988-11-08

Kittle, John E.

Radiation imagery chemistry: process, composition, or product th

Radiation modifying product or process of making

Screen other than for cathode-ray tube

430 4, 430293, 430359, 430396, G03F 900

Patent

active

047833858

ABSTRACT:
Process for production of photographic masks for tonal correction by dry dot etching comprising exposing a mask film, e.g., positive film, behind a film combination of half-tone positives and negatives that contains at least one pair of a positive and a negative of the same color separation, said pair being separated from one another by a spacer film, e.g., transparent, matt film, etc. The half-tone values at the points to be corrected are in the range of 30-70%.

REFERENCES:
patent: 2692825 (1954-11-01), Sportelli
patent: 2701196 (1955-02-01), Conrad
patent: 3085878 (1963-04-01), Archer
patent: 3251689 (1966-05-01), Hellmig
patent: 3615441 (1971-11-01), Deneau
patent: 4241153 (1980-12-01), Rovnjev
patent: 4262071 (1981-04-01), Larson
patent: 4329411 (1982-05-01), Land
patent: 4339517 (1982-07-01), Akimoto
patent: 4450215 (1984-05-01), Reithel
patent: 4670371 (1987-06-01), Mino et al.

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