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Two-stage density compensation method

A density and pre-compensation technology, applied in printing, instruments, electrical components, etc., can solve problems such as inhomogeneity and difficulty in density compensation

Active Publication Date: 2020-04-03
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Density compensation is particularly difficult in the case of local frequent occurrence of white lines to be compensated, visually visible inhomogeneities often remain

Method used

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  • Two-stage density compensation method
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  • Two-stage density compensation method

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Embodiment Construction

[0044] The method according to the invention is applied in an inkjet printer 3 located in a specific workflow system. figure 1An example of such a workflow system is shown in . Such a workflow system runs on one or more prepress stage computers 1 , by means of which the corresponding print jobs 5 are processed. Here, the print job 5 to be printed on the inkjet printer 3 is rasterized by a raster image processor 2 and the rasterized print image 4 is passed from there to the inkjet printer 3 for Make corresponding formal printing. In this case, the calibration according to the invention takes place between the gray values ​​of the individual color separations of the image in the prepress stage and the corresponding raster pattern pattern 7 by means of the raster image processor 2 , which is likewise on the computer 1 Running on the computer 1 is capable of producing rasterized print images 4 on these raster pattern forms 7 in concert with the prepress stage computers of the wo...

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Abstract

A computer-assisted method for compensating for position-dependent density fluctuations in printing nozzles of inkjet printing heads in an inkjet printing machine includes implementing pre-compensation for all color separations of a print image during the halftoning process in the pre-print department on the basis of a pre-defined density compensation profile by using a pre-print computer. Onlinecompensation is implemented for all color separations of the now pre-compensated print image during an on-going production run for producing the print image on the basis of a re-calculated density compensation profile by using a control unit of the inkjet printing machine.

Description

technical field [0001] The invention relates to a method for compensating density inhomogeneities transverse to the printing direction in an inkjet printing machine. [0002] The technical field to which the present invention pertains is inkjet printing. Background technique [0003] An important quality mark in printing is the achievement of a clear, well-defined mapping (abbildung) of the image content / subject matter. In this case, the mapping at all locations within the printable format should produce the same result, which requires a uniformity of printing in terms of position. The difficulty with digital printing is to ensure this required uniformity transversely to the printing direction (X track). In general, an inkjet print head exhibits a certain scattering of the jetting of the individual nozzles. The reasons for this are: scattering in production, scattering in the ink supply of printing nozzles, scattering in mechanical scattering of piezoelectric actuators, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/21H04N1/60
CPCB41J2/21H04N1/60G06K15/027B41J2/2103
Inventor A·豪克I·特拉莎娜斯B·施特里泽尔F·克洛普纳
Owner HEIDELBERGER DRUCKMASCHINEN AG