Method of reproducing transparent masters

Details Method of reproducing transparent masters Method of reproducing transparent masters

1997-12-29

1999-07-20

Metjahic, Safet

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 77, 355 35, G03B 2772, G03B 2732

Patent

active

059262583

ABSTRACT:
A master to be copied has a picture in which a dark region and a light region are located one behind the other. The two regions are separated by a light/dark transition where a halo can develop on copies of the master. Prior to copying, the master is scanned and the resulting data used to produce a mask for the master. The mask has a light/dark transition corresponding to the light/dark transition of the master. However, the light/dark transition of the mask is shifted relative to the light/dark transition of the master. The shift is such that, when the mask is superimposed on the master, the light/dark transition of the mask is superimposed on a region of the master which reduces the visibility of the halo. The master is copied following masking.

REFERENCES:
patent: 5155524 (1992-10-01), Oberhardt et al.
patent: 5352613 (1994-10-01), Tafas et al.
patent: 5467165 (1995-11-01), Jacob et al.
patent: 5621502 (1997-04-01), Bronaugh et al.
patent: 5638153 (1997-06-01), Zahn et al.

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