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Correction of Color Deviation in Digital Printing Machine

A printing press, digital technology, applied in the field of color adjustment, which can solve problems such as multiple ICC profile logic problems

Active Publication Date: 2020-01-17
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem with this approach is that, due to the large number of different printed substrates, there is a logical problem of managing multiple ICC profiles specific to the substrate

Method used

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  • Correction of Color Deviation in Digital Printing Machine
  • Correction of Color Deviation in Digital Printing Machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] exist figure 1 , lists the tonal value data of the printed color on the x-axis from 0 to 100% screening. On the Y axis the color density value DV is listed. Here, the upper curve shows the color density value obtained without using the correction coefficient, and the lower curve shows the color density value after correction with the coefficient. here, figure 1 The coefficient used in is F=0.9.

[0015] figure 2 , the tonal value data of the same printing color in the range of 0 to 100% screening are again listed on the X-axis and the tonal value increase (Tonwertzunahme) is listed on the Y-axis. Here again, the upper curve shows the tonal value without correction factor, while the lower curve shows the tonal value corrected with the factor. Here, the coefficient is F=0.9. It can be seen that the tonal value increase is minimal in the 0% screening range as well as in the 100% screening range, while the tonal value increase is minimized in the 50% range . In ter...

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Abstract

The invention relates to a method for color adjustment in a digital printing press by means of a control computer and a color measuring instrument, comprising: the digital printing press prints a printing material using at least one test pattern; the color measuring instrument measures the printing material; The color value is compared with the rated color value; the control computer calculates the difference between the rated color value and the actual color value; the allowable deviation between the rated color value and the actual color value is exceeded, and the control computer calculates the full tone value and / or by at least one factor. Or the mesh tone value is changed; the test pattern is reprinted with the help of the mesh tone value corrected by the coefficient of the test pattern, and the color measuring instrument detects the new actual color value; the control computer compares the new actual color measurement value with the rated color measurement value; control The computer calculates the difference between the actual color value and the rated color value; the difference between the new actual color value and the rated color value is below the allowable deviation, and the digital printing press prints.

Description

technical field [0001] The invention relates to a method for color adjustment in a digital printing press by means of a control computer and a color measuring device. Background technique [0002] Just as in offset printing presses, in digital printing presses such as inkjet printing presses or printing presses based on toner technology, the goal is to reproduce today's printing originals in mostly digital form as faithfully as possible. For this purpose, today there are many technologies for this purpose which guarantee color fidelity by implementing a color adjustment process in a digital printing press. A known possibility here is to measure the printing material with the aid of a color measuring device during the printing process; calculate possible deviations; and subsequently minimize these deviations by carrying out regulatory interventions in the color guidance of the digital printing press . By taking into account in advance the characteristics of the printing pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/60
CPCH04N1/6075G06K15/027H04N1/6033H04N1/6097G03G2215/00569G06K15/1878G03G15/5062G06K15/102B41J2/2132H04N1/40H04N1/407
Inventor N·普法伊费尔
Owner HEIDELBERGER DRUCKMASCHINEN AG
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