Patent · US Expired

Method of determining ink coverage in a print image

US5967033A · kind A · utility

6Cited by

3References

12Claims

0Family size

Assignee

Heidelberger Druckmaschinen AG · DE

Inventors

Nikolaus Pfeiffer · Dover, US
Manfred Schneider · Lichtenfels, DE
Hans Ott · Regensdorf, CH

Key dates

Filing date	Nov 3, 1998
Grant date	Oct 19, 1999
Priority date	—
Expiry date	Nov 3, 2018

Classification

Technology area (CPC G)Physics
CPC primaryG01J3/46
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

For determining the ink coverages of printing inks involved in printing in one pixel of a print image, the pixel is scanned photoelectrically in the visible range of the spectrum and also in the near infrared range. Color coordinates of a perceptually approximately equidistant color system and at least one infrared value are formed from the scanned signals thus obtained. The ink coverages of the printing inks involved in the printing are then calculated from these color coordinates and from the minimum of one infrared value and are allocated to the pixel.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.