Method for angle-dependent color value correction

A technology of angle correlation and angle, which is applied in the direction of color measurement device, spectrometry/spectrophotometry/monochromator, general parts of printing machinery, etc. It can solve the problem of incomparability and inability to realize reliable quality control of substrates, etc. question

Active Publication Date: 2010-10-20
HEIDELBERGER DRUCKMASCHINEN AG
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Problems solved by technology

[0003] If the camera is now used as a color measurement and color adjustment system, the above situation leads to the fact that the measured color values ​​at different angles are not comparable even in the case of identically colored originals
Reliable quality control of the coloring on the produced printing material cannot therefore be achieved with existing camera systems

Method used

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  • Method for angle-dependent color value correction
  • Method for angle-dependent color value correction
  • Method for angle-dependent color value correction

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Embodiment Construction

[0014] A sheet-fed offset printing press 4 is shown schematically in the figure. The sheet-fed offset printing press 4 includes, for example, two printing units, a feeder and a delivery. Furthermore, the printing press 4 is connected to a computer 3 , which simultaneously serves as a control computer for the printing press 4 . In addition, an RGB camera 1 is connected to the computer 3 as a color sensor, which in the present case detects a sheet-shaped printing material 2 . In the diagram shown, the color measurement of the printing material 2 is carried out outside the printing press 4 . However, the camera 1 can also be arranged in one of the printing units, preferably in the last printing unit of the printing press 4 , and detect the printing material 2 directly in the printing press. It can be seen in the figure that two color areas 5 of the same color are detected under different viewing angles α. The color area 5 on the right is detected under the viewing angle α=0, w...

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Abstract

The invention relates to a method for angle-dependent color value correction, concretely a method for registering color measured values on printing materials with a color sensor includes registering the color measured values on the printing materials at different angles of observation of the color sensor. The angular dependence of the color measured values registered on the printing materials at different angles of observation is corrected in a computer.

Description

technical field [0001] The invention relates to a method for detecting color measurements on a printing material by means of a color sensor, wherein the color measurement values ​​on the printing material are detected at different viewing angles of the color sensor. Background technique [0002] For quality control of the printing materials produced on the printing press, the color of the printing materials is measured by means of a color measuring device and the measured values ​​are compared with the corresponding values ​​of the printed original. If there is too great a deviation between the measured values ​​on the printing sheets and the values ​​of the printed original, these printing sheets are waste pages. Waste pages must be avoided as much as possible, as it creates unnecessary costs and cannot be sold. Whereas in the past the printed material was measured outside the printing press, for which proofs were taken out of the printing press at regular intervals, durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41F33/00G01J3/46
CPCG01J3/462B41P2233/51B41F33/0081G01J3/46
Inventor W·胡贝尔
Owner HEIDELBERGER DRUCKMASCHINEN AG
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