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Method and system for am screening and protecting printed matter

A technology of dots and screens, which is applied to the electrical recording process using charge graphics, equipment and instruments for the electrical recording process using charge graphics, and can solve problems such as the stability of the printing process, so as to improve quality and reduce waste. Effect

Active Publication Date: 2020-12-15
HEIDELBERG POLSKA SP ZOO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This dot gain effect is difficult to avoid and can lead to significant problems in the stability of the printing process

Method used

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  • Method and system for am screening and protecting printed matter
  • Method and system for am screening and protecting printed matter
  • Method and system for am screening and protecting printed matter

Examples

Experimental program
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Embodiment Construction

[0055] The present invention relates to structures and methods for generating amplitude modulated multi-clustered halftone dots.

[0056] The halftone dots presented here are generated based on a dot function that determines the sequence of clusters (i.e. the order in which the corresponding clusters are activated), where each cluster has an associated cluster function that determines the sequence of pixels (ie, the order in which the corresponding device pixels in the region of a particular cluster are activated).

[0057] The halftone dots disclosed herein include at least one cluster having a shape other than a rectangular shape. In particular, the shape of most or all of the clusters of dots differs from a rectangular shape. Furthermore, at least two clusters may include different numbers of device pixels. Thus, clusters of halftone dots have different sizes and different shapes.

[0058] image 3 A first embodiment of a halftone dot (D) is shown, which has a size of 8...

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PUM

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Abstract

A computer-implemented method for generating an amplitude modulated multi-cluster halftone dot for use in an amplitude modulated screen, the method comprising the steps of: determining (302) an arrangement of clusters within the dot determining (303) a corresponding cluster function for each cluster, the cluster function defining a sequence of pixels representing the activation order of device pixels within the region of a particular cluster; determining (304) for the dots a dot function, the dot function defining a sequence of clusters representing the order of the clusters; and generating a data set representing dots for a particular tone value by The device pixel activated by the cluster function and the dot function.

Description

technical field [0001] The invention relates to an offset printing including AM screening. Background technique [0002] Offset printing utilizes printing plates having a surface composed of hydrophilic / oleophobic and hydrophobic / oleophilic regions, which correspond respectively to printing / non-printing elements of the image. A separate printing plate is used accordingly for each color used in the printing process. [0003] Continuous tone images can be simulated by the halftone technique, which reproduces continuous tone through variations in the screen, size, or spacing of dots. The quality of the printed image depends largely on the parameters of the screening process. The screening process may also affect the printing process flow and its cost due to the cost of material consumption, ink, humectant or remover and amount required, and thus the waste generated in the printing process. [0004] figure 1 Shows the sequence of conventional technical operations performed i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/00H04N1/405
CPCH04N1/00485H04N1/405H04N1/4055G03G15/556H04N1/40043H04N1/4051
Inventor A·昆斯泰特M·赫梅莱夫斯基T·亚辛斯基
Owner HEIDELBERG POLSKA SP ZOO