Pre-press color proof system having improved tonal range in high

Details Pre-press color proof system having improved tonal range in high Pre-press color proof system having improved tonal range in high

1988-06-07

1989-09-26

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Methods

355 32, G03B 2732, G03B 2752

Patent

active

048704555

ABSTRACT:
A method is disclosed of preparing an extended tonal range pre-press proof of an original subject in color using photographic color print paper. Yellow, magenta and cyan color halftone separation negatives and positives of the original subject are prepared along with a pin dot maker film positive (PDM) which is clear only in the extremely fine highlight detail areas of the color original. After exposure of photographic color print paper to combinations of the yellow, magenta and cyan halftone separation negatives and positives through respective blue, green and red filters, in each instance the yellow, magenta and cyan halftone negatives are used to again expose the undeveloped print paper to blue, green and red filtered light respectively in association with the PDM. A black separation halftone negative may also be used in the process to improve the final appearance of the product. The resulting pre-press color proof has enhanced fine highlight color detail. Pin dots and vignettes match detail which is to be lithographically reproduced or reproduced by a variety of printing procedures such as lithographically or with a gravure press or the like.

REFERENCES:
patent: 4553835 (1985-11-01), Morgan
patent: 4806984 (1989-02-01), Asano

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