Method and apparatus for eliminating defects in images in polychromatic printing due to faulty registration of superimposed printing of color separations

US4583116A · kind A · utility

Assignee

• Dr. Ing. Rudolf Hell GmbH · DE

Inventors

• Eberhard Hennig · Ascheberg, DE
• Jurgen Klie · Bitburg, DE

Key dates

• Filing date: May 24, 1983
• Grant date: Apr 15, 1986
• Expiry date: May 24, 2003

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N1/58
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Method and apparatus for eliminating image defects in polychromatic printing which arise due to lack of registration in the superimposed printing of individual color separations with different colored inks wherein from the four color separation signals M, C, Y and K the color separation signal which defines the contour is determined in the area of the contour. This color separation signal which corresponds to the color of the selected signal is replaced in the lighter or, respectively, darker area by the selected color separation signal and the color separation signals of the darker or, respectively, lighter areas which are adjacent to the lighter or, respectively, darker areas are retained unaltered so that the white streaks and imperfections of the prior art are eliminated.