Method for producing printing forms with irregularly distributed printing points

US4485397A · kind A · utility

Assignee

• Ing. Rudolf Hell GmbH · DE

Inventors

• Karl Scheuter · Darmstadt, DE
• Gerhard Fischer · Offenbach, DE

Key dates

• Filing date: Aug 30, 1982
• Grant date: Nov 27, 1984
• Expiry date: Aug 30, 2002

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N1/4051
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A method for producing printing forms by way of irregularly-distributed printing points provides that an image original be opto-electrically scanned across individual surface elements with a desired detail resolution. A gray scale corresponding to the scanning signal is assigned to each surface element and surface elements of the same or approximately the same gradation are combined into sub-surfaces and the individual sub-surfaces are reproduced in accordance with their gradation value by way of a plurality of statistically-distributed printing points whose overall surface coverage within the sub-surface corresponds to the gradation of the sub-surface, whereby the combination of the sub-surfaces is undertaken in accordance with the actual boundaries of the same or approximately the same gradation within the original image.