Potentials and restrictions of grey component replacement (GCR) in newspaper printing (2.16)
Date
11/1996
Author
Werfel, Manfred
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Abstract
More stable greybalance, less rub-off and less colour variation during printing are compelling reasons why newspapers should print their colour ‘pictures using Grey Component Replacement (GCR) as the basis for the colour separation.
In this project, carried out by EMPA/UGRA, there were two printing phases. In the first part, both three- and four-colour pictures were printed in production runs and the colour variation during printing was measured. The results showed variation could be significantly reduced by using GCR. In the second part, we concentrated on trying to find the optimal Photoshop settings using GCR. Both GCR and UCR were tested, varying the Total Area Coverage between 170% and 330%. This report aims to help newspapers to optimally set up GCR. However, GCR should be used on the understanding that the method offers better and more stable printing conditions, and not necessarily a higher level of colour reproduction.
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