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Compensation by means of additive color

A technique for adding printing and color values, applied in the direction of power transmission devices, printing, electrical components, etc.

Active Publication Date: 2019-12-27
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This choice of a neutral color correction color for gray is a compromise, since the color value of this correction color lies between the color values ​​of the process color used, but it is impossible to exactly match this color value

Method used

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  • Compensation by means of additive color
  • Compensation by means of additive color
  • Compensation by means of additive color

Examples

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Embodiment Construction

[0024] A preferred field of application for implementing the variant is the inkjet printer 7 . figure 1 An example of the basic structure of a machine 7 of this type comprising a feeder 1 for feeding a printing substrate 2 into a printing mechanism 4 where the printing substrate 2 is printed by a printing head 5 is shown in Receiver 3. Here, this is a sheet inkjet printing press 7 controlled by a control computer 6 . As already described, during operation of the printing press 7 it may occur that individual printing nozzles in the printing head 5 of the printing unit 4 fail. The consequence is white lines 9 or, in the case of multicolor printing, distorted color values. figure 2 An example of such a white line 9 is shown with a printed image 8 .

[0025] In its preferred embodiment, the invention describes a method for compensating white lines 9 which can also be used in addition to other methods. The important difference is that the resulting white line 9 is compensated ...

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PUM

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Abstract

The invention relates to a method for compensating for faulty printing nozzles in an inkjet printer (7) by means of a computer (6), wherein there is an additional printing head (5a) for compensation,the additional printing head (5a) is supported behind a printing head (5) for conventional printing and balances error parts of a faulty printing nozzle in the following manner: the additional printing head (5a) prints the error parts with a correction color (12) exhibiting a gray tone. The method is characterized in that the color value of the correction color (12) in the CIE-Lab color space is optimized in such a way that the color interval (11) of the correction color (12) from the entire process color (14, 15, 16) used is as small as possible except for the yellow color (13).

Description

technical field [0001] The invention relates to a method for compensating faulty printing nozzles in an inkjet printing machine by means of additional correction colors. [0002] The technical field to which the present invention pertains is digital printing. Background technique [0003] In general, in digital (or inkjet) printing, the color to be printed is usually not one of the process colors CMYK in four-color printing, or an additional color or spot color OVG or other possible additional colors in multi-color printing Instead, it appears as a mixture of multiples of these base colors. Like the primary / process / process color, this mixed color is characterized by a fixed local position in the CIE-Lab color space. The microscopic arrangement of the color dots of the primary colors also requires a suitable rasterization of the printing material (Sujet), in order to achieve the impression of mixed colors macroscopically. [0004] In inkjet printers, printing nozzles can m...

Claims

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Application Information

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IPC IPC(8): B41J2/21
CPCB41J2/2139B41J2/2146B41J2025/008H04N1/4015H04N1/6008
Inventor S·内布N·R·诺瑞克A·亨J·福歇M·迈尔
Owner HEIDELBERGER DRUCKMASCHINEN AG
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