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Method for calculating a spot color database

A database and spot color technology, applied to the general parts of printing machinery, printing, printing machines, etc., can solve the problems of expensive and expensive processing

Active Publication Date: 2016-04-27
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 for calculating a spot color database
  • Method for calculating a spot color database
  • Method for calculating a 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

A method for calculating spectral data records for spot colors includes the steps of generating or selecting spectral characterization data of a printing process; selecting colorimetrically defined spot colors from a color table; calculating the spectrum of the spot colors based on the spectral characterization data on a white printing substrate and on a black printing substrate; calculating the spectrum of the halftone spot colors from the spectra of the spot colors on a white substrate and on a black substrate; adapting the spectra of the spot colors to a defined white printing substrate; adapting the spectra of the spot colors to the predetermined values from the color table; adapting the spectra of the spot colors to a defined black printing substrate; and adapting the spectral dot gains to a defined standard.

Description

technical field [0001] The invention relates to a method for calculating a database of spot colors, which method has the features stated in the preamble of claim 1 . [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 ...

Claims

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Application Information

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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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