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Method used to calculate spot color database

A database, spot color technology, applied in general parts of printing machinery, printing, printing presses, etc., can solve the problems of processing cost and high cost

Active Publication Date: 2017-09-19
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, proof printing of all spot colors on light and dark substrates, spectral measurements, and processing of the measured values ​​for spectral characterization of spot colors is extremely laborious and expensive

Method used

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  • Method used to calculate spot color database
  • Method used to calculate spot color database
  • Method used to calculate spot color database

Examples

Experimental program
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Embodiment Construction

[0091] exist figure 1 In , a spot color database 4 in the form of a color scale card 1 is shown as an example. This is a color database in which the corresponding spot color values ​​are represented as printed color values. The printed color values ​​can serve as an initial basis for the spot color table 1 in which the spot colors to be calculated are compiled, for which the spectral data set 5 is to be created.

[0092] However, for use in the color control of printing presses, the spectral data set 5 must be in digital form. For this, a defined infrastructure is required. Thus, in figure 2 A corresponding overall system using these data sets 5 and the method according to the invention is shown in simplified form in . The overall system generally includes: the printing press 2 itself; a computer-supported workflow system 3 connected to the machine 2 via a network 6 for controlling the printing press 2 . In addition, a form of a digital database 4 must be provided for st...

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Abstract

The invention relates to a method for computing a spectral data set for a spot color by means of a computer, the method comprising the steps of: generating or selecting spectral characterization data for a printing process; selecting a spot color defined in terms of chromaticity from a color table ; Calculate the spectrum of the spot color from the spectral characterization data on the white and black printing materials; calculate the spectrum of the screened spot color from the spectrum of the spot color on the white and black printing materials; Adapting the spectrum of a color to a defined white substrate; Adapting the spectrum of a spot color to a predetermined value in the color table; Adapting the spectrum of a spot color to a defined black substrate; Adapting the hue value of the spectrum Increases fit to defined criteria.

Description

technical field [0001] The invention relates to a method for calculating a spot color database. [0002] The technical field of the present invention is electronic reproduction technology. Background technique [0003] Spot colors are used when creating printing originals. The goal is to achieve clear and verifiable color reproduction. The spot color is determined by the color standard card or the test value of the color sample. Spot colors are characterized by color values. The CIELAB color system is generally used here, and the colors are identified by the three coordinates L*, a* and b*. Known spot color systems include the RAL system, the HKS system or the PANTONE system. [0004] Spectrally characterized spot colors are in turn necessary for calculating overprinting of primary and spot colors, for calculating overprinting of two or more spot colors, and for arrangement, regulation and control in printing. However, experimentally ascertaining the spot color spectru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41F33/00
CPCB41F33/0036B41F33/16H04N1/54H04N1/603H04N1/52H04N1/6008H04N1/6019
Inventor G·贝斯特曼
Owner HEIDELBERGER DRUCKMASCHINEN AG
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