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Multilevel density compensation for digital printing machines

A color density, computer technology, applied in the field of correcting color density unevenness, can solve the problem of insufficient compensation in the image area, and achieve the effect of color density improvement and rapid correction

Active Publication Date: 2018-09-25
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Image areas in the printed image from which tonal values ​​deviate are mostly insufficiently compensated

Method used

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  • Multilevel density compensation for digital printing machines
  • Multilevel density compensation for digital printing machines
  • Multilevel density compensation for digital printing machines

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Embodiment Construction

[0019] figure 1 The influence of the novel multi-level density compensation method (Multi-Level-Dichte-Kompensations-verfahren) on the screened printed image during the generation of ink droplets for the control of an inkjet printer is shown. First, as in the prior art, the printed image is screened into color separations by means of the screening method 5 . In the screening method 5, a color separation is produced in gray scale for each color. These grayscale pixels must then be converted into corresponding control parameters for controlling the printing nozzles of the inkjet printer. exist figure 1 , here working with two different drop sizes, namely: drop sizes S and M. In addition, from the conversion table Linoprint 02 (Pure S) of the screening software with screening type, it can be seen that when increasing the area coverage, in the range of area coverage between 0 and 50%, the image that does not exist will be The dots become small ink droplets S, and in the case o...

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PUM

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Abstract

The invention relates to a method correcting color density unevenness during a printing operation on an inkjet printing machine having printing nozzles and a computer. The computer modifies the numberor size (0, S, M, L) of the ink drops to be applied to a printing substrate to attain nominal color density values after the processing of a rasterized print image. The method is characterized in that: for different actual tone values, it is determined which target tone value is required to attain a nominal coloration by measuring a test image for every printing nozzle using a color measurement device, and, based thereon, an area coverage-dependent compensation profile is determined and saved on the computer to be applied in the printing operation to calculate the number and size (0, S, M, L) of the ink drops on the computer.

Description

technical field [0001] The invention relates to a method for correcting color density inhomogeneities during the printing process of an inkjet printer with printing nozzles and a computer, wherein the computer, after processing a screened printed image, in order to achieve a nominal color density value , to vary the number or size of ink drops to be applied to the substrate. Background technique [0002] Among the general methods for correcting color density unevenness (Unebenheit) is concerned with: Even after screening / rasterizing (Rastern) the printed image, it is possible to carry out color density correction without the printing image Do a rescreen. This is important because rescreening a printed image requires a lot of computational power and time intervals. Especially in the case of minor corrections to the color density, the time-consuming rescreening of the printed image is not economical, since the printing process would be correspondingly delayed. This is espec...

Claims

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Application Information

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IPC IPC(8): B41J29/38
CPCB41J29/38H04N1/4057H04N1/502G01J3/46B41J2/211B41J2/2121B41J2/2132
Inventor M·迈尔I·特拉莎娜斯A·舍曼G·容汉斯T·施兰克
Owner HEIDELBERGER DRUCKMASCHINEN AG
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