Proof light

Details Proof light Proof light

1989-05-16

1991-01-29

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 71, G03B 2780

Patent

active

049890328

ABSTRACT:
A phase-controlled, multi-color light is disclosed for proofing of colors before a job is run on a printing press. A controlled manipulation of the spectral intensity of red, green and blue light as exposed through various flats produce specific colors in proofing material. The proper exposure parameters or data are keyed into a computerized control which includes a number of printing process memories with each memory accepting a number of flats or films with a specific response for a given printing condition. This permits storage of frequencyly used conditions as well as modifications as desired. The color palette is also operator programmed. With such programming the combining of spectral values will result in a specific combined spectral value to create a specific color in the proof. Because of this procedure only one exposure is required for each of the cyan, magenta, yellow and black exposures to obtain the position and acceptance color proof of the color layout. Additional exposures can be added for cropping marks and cut and fold lines and to create a background color.

REFERENCES:
patent: 1703449 (1929-02-01), Huebner
patent: 3157087 (1964-11-01), Kallenberg
patent: 3279311 (1966-10-01), Lichtner
patent: 3312143 (1967-04-01), Karow et al.
patent: 3887279 (1975-06-01), Rubin
patent: 4068943 (1978-01-01), Gyori
patent: 4236818 (1980-12-01), Fauchier
patent: 4371259 (1983-02-01), Howitt
patent: 4565441 (1986-01-01), Evans et al.
patent: 4657378 (1987-04-01), Hope et al.

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