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Spot color substitution mode

A spot color and color technology, which is applied in the field of color control of printing machines, can solve problems such as inconsistency and unclear where the user's color body is located, and achieve the effect of low cost

Pending Publication Date: 2021-10-12
HEIDELBERGER DRUCKMASHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a manual adaptation of the nominal Lab values ​​is a kind of blind behavior (Blindflug), because it is not clear where the user is relative to the color body
Both of the above known methods therefore involve the risk that nominal values ​​are set which do not correspond to what was originally intended, but which are mapped more or less randomly by the ICC color profile of the process to the available accepted color value

Method used

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  • Spot color substitution mode
  • Spot color substitution mode
  • Spot color substitution mode

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Embodiment Construction

[0027] The field of application of a preferred embodiment of the method according to the invention is printing machines 7 . In general, the type of printing press is not decisive for the method according to the invention, as long as they have a process color space and can perform color adjustment color changes in the printing machine-independent Lab color space. exist figure 1 An example of the basic construction for such a machine 7 (here in the form of an inkjet printing machine) comprising a feeder for feeding the printing substrate 2 into the printing mechanism 4 is shown in 1 to the stacker 3 where the printing unit 4 prints the printing substrate 2 by the printing head 5 . In this case, this is a sheet inkjet printing press 7 , which is controlled by a control computer 6 with a display 8 .

[0028] exist Figure 8 The procedure of the method according to the invention is schematically shown in . The method according to the invention offers the user the possibility to...

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PUM

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Abstract

The invention relates to a method for replacing a spot color for a printing process during color setting of a printing press (7) by means of a computer (6). The method comprises the following steps: calculating, by the computer, a replacement color value (14a) for a selected spot color; calculating a color space of the printing process and presenting the color space with the limited color bodies (9, 11) of the printing process and the calculated replacement color value (14a) in the color space by means of a display (8); checking and correcting the color coordinates of the replacement color value and optionally also the color coordinates (14b, 14c) of a further target color value by a user; performing the printing job with corrected replacement color value (14b, 14c) and optionally corrected further target color value in the printing press (7).

Description

technical field [0001] The invention relates to a method for substituting spot colors in the color setting of a printing press. [0002] The invention belongs to the technical field of color regulation of printing machines. Background technique [0003] There is now a need to reproduce the color impression of spot colors on press without using spot colors. Especially in digital printing presses, this is important because the ink set Here it is typically confirmed and cannot inject any spot colors. If the color model value / Lab value (Lab-Wert) of the spot color lies outside the color body (ie the renderable color space of the printing process), the substitute Lab value must be reproduced instead of the original Lab value. The mapping (abbildung) from the original Lab values ​​to the substitute Lab values ​​typically takes place via the ICC color profile (ICC-Profil) of the printing process. Especially for those colors that lie further outside the color volume, an alterna...

Claims

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Application Information

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IPC IPC(8): B41F33/10B41F33/00
CPCB41F33/10B41F33/00H04N1/603H04N1/622
Inventor H·汤姆森P·魏因霍尔茨S·博尔曼
Owner HEIDELBERGER DRUCKMASHINEN AG