Printing – Processes – Condition responsive
Patent
1998-01-29
1999-09-07
Fisher, J. Reed
Printing
Processes
Condition responsive
101365, B41F 3104, B41F 3316
Patent
active
059470291
ABSTRACT:
In a process for assessing the quality of a print image produced on a printing material in a multi-color printing process, in which signals which reproduce print-image elements are generated with an image-recording arrangement, in which color values are derived from the signals for every print-image element, in which the color values are transformed into color measures of a predetermined color space, in which color distances between an actual color site and a desired reference color site are determined for the print-image elements, correction variables of the control elements (18, 19, 20, 21), whose effect on a control element (18) would cause the actual color sites to be as close as possible to the reference color sites, are calculated from the color distances and stored in memory, that the color-distance vectors (.DELTA.L.sub.Bn, .DELTA.a.sub.Bn, .DELTA.b.sub.Bn) and color distances (.DELTA.E.sub.Bn) of at least one predetermined reference image (B.sub.n) with homogeneous area coverage are determined as a measure for the quality in the said print-image region, the correction variables (.DELTA.s.sub.B, .DELTA.s.sub.C, .DELTA.s.sub.M, .DELTA.s.sub.Y) which are necessary for compensation of the color distances (.DELTA.E.sub.Bn) in the reference image (B.sub.n) corresponding to the previously calculated and stored correction variables.
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Advances in Printing Science and Technology, proceedings of the 18th International Conference of Printing Research Institutes, Williamsburg, USA, Jun. 1985, pp. 66-79.
Loeffler Gerhard
Pfeiffer Nikolaus
Schneider Manfred
Fisher J. Reed
Heidelberger Druckmaschinen Aktiengesellschaft
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