EP0321402A1 - Procédé de commande ou du réglage de l'encrage d'une presse à imprimer - Google Patents

Procédé de commande ou du réglage de l'encrage d'une presse à imprimer Download PDF

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Publication number
EP0321402A1
EP0321402A1 EP88810844A EP88810844A EP0321402A1 EP 0321402 A1 EP0321402 A1 EP 0321402A1 EP 88810844 A EP88810844 A EP 88810844A EP 88810844 A EP88810844 A EP 88810844A EP 0321402 A1 EP0321402 A1 EP 0321402A1
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EP
European Patent Office
Prior art keywords
color
location
correction
color location
target color
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88810844A
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German (de)
English (en)
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EP0321402B1 (fr
Inventor
Hans Ott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gretag AG
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Gretag AG
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Filing date
Publication date
Application filed by Gretag AG filed Critical Gretag AG
Publication of EP0321402A1 publication Critical patent/EP0321402A1/fr
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Publication of EP0321402B1 publication Critical patent/EP0321402B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2233/00—Arrangements for the operation of printing presses
    • B41P2233/50—Marks on printed material
    • B41P2233/51—Marks on printed material for colour quality control

Definitions

  • the invention relates to a method for color control or color regulation of a printing press according to the preamble of claim 1.
  • predetermined boundary conditions in particular predetermined minimum and / or maximum layer thicknesses of the printing inks, it is not possible due to predetermined boundary conditions, in particular predetermined minimum and / or maximum layer thicknesses of the printing inks, to shift the actual color location to the predetermined target color location.
  • there remains a color difference error which has a more or less disruptive effect, since the predetermined target color location is outside the correction color space, the dimensions of which are predetermined by the permissible changes in the layer thicknesses of the solid densities of the printing inks involved.
  • EP-A 124 908 describes a device and a method for determining the required raster area coverage of color separations, which can be displayed in percent, in order to reproduce the color of a given template pattern to be reproduced as accurately as possible.
  • the known device has a measuring head which contains, for example, filters for the colors red, green and blue and allows color information, in particular color densities, of the respective scanned originals to be measured using these filters.
  • the measuring head is connected to a data processing device, which has a keyboard used in scanning predetermined reference patterns for entering raster area coverage in percent.
  • the data processing device furthermore has a display device for displaying raster area coverage degrees calculated on the basis of the scanning of a template pattern.
  • a conversion table for converting color information into raster area coverage levels which is stored in a memory of the data processing device.
  • First a color sample card is printed.
  • the colors cyan, magenta, yellow and black are used to print the color sample card, whereby grid area covers between 0% and 100% are used in increments of 10% for all colors. This results in 14,641 combinations for the grid area coverings and the associated color information, for example recorded as color densities.
  • the combination of the screen area covers used is entered via the keyboard and assigned to the color densities detected by the measuring head.
  • the device When the conversion table has been created, the device allows a previous day's pattern to be reprinted to be scanned using the measuring head and, by comparing the color densities recorded using the various filters with the color densities stored in the conversion table, the row in the conversion table whose color density values match those with the measured color densities of the original pattern match or best match. If this line is found in the conversion table, the assigned screen coverage levels for, for example, three or four color separations are displayed on the display device or forwarded to an external device. Since the grid area covers for printing were changed in increments of 10% when creating the color sample card, the conversion table is relatively rough and inaccurate.
  • additional intermediate values for the color information and the associated raster area covers are determined by interpolation of the values in the conversion table.
  • the interpolation can be carried out in such a way that increments of 1% are provided, which results in a more precise reproduction of the template pattern to be reprinted.
  • the color distances between the color information of the template pattern and the color information in the conversion table are calculated in the data processing device.
  • the known method can also be designed in such a way that before the output of values for the raster area coverage, a query is made as to whether values of 0% or 100% are present. By extrapolating the screen coverage levels and the color densities, an extended color space for screen coverage between - 10% and 110% is determined due to the color density changes in the range between 0 and 10 or 90 and 100%. In this way, the known method allows an indication of the non-reproducibility of a template pattern.
  • the object of the invention is to sharpen a method which allows the highest possible print quality to be achieved even if the specified target color location lies outside the correction range limited by the specified boundary conditions. This object is achieved by the characterizing features of claim 1.
  • the predetermined target color location which cannot be reached, is replaced by an accessible target color location according to a control strategy
  • an optimal position in the color coordinate space can be achieved for the actual color location can be controlled.
  • the color location that is defined by the intersection of the color distance vector between the actual color location and the target color location with the surface of the color correction body is selected as the achievable target color location.
  • the achievable target color location with the smallest distance from the predetermined target color location can be found in that a plumb line is reached from the predetermined target color location to the surface of the correction color space by the predetermined target color location. If no solution for this is possible, a solder is erected on the nearest side edge instead of a solder on the surface. If no solution is possible for this either, the closest corner of the color correction space is the closest point.
  • the attainable target color location is calculated by selecting the intersection point closest to the predetermined target color location of a parallel to the brightness coordinate axis through the predetermined target color location with the surface of the correction color space as the attainable target color location. If such an intersection does not exist, it is expedient to proceed according to the control strategies according to subclaims 7 to 8.
  • FIG. 1 shows a closed control system of a printing system, which has an electronic device for processing measured values 10 in order to generate control data 11 with which a control console 20 is acted upon, which generates control signals 21 for the ink guide elements of a printing press 30 from the control data 11 which, for example is a multi-color offset press. (Only the colors cyan, magenta and yellow are relevant for the following).
  • the control loop of the printing system serves to keep the color deviations on the printed sheets 40 printed by the printing press 30 as small as possible compared to predetermined target colors.
  • the detection of the colors on the printed sheet 40 is carried out by measuring color measurement fields 41 with printed color measurement strips which are preferably colorimetrically and / or densitometrically automatically and continuously optically scanned with the aid of a measuring head 42.
  • the color measuring device supplies densitometric measured values of the single-color full-tone measuring fields and colorimetric measuring values of the single- or multi-colored measuring fields, from which a computer in measured value processing 10 uses the specified density limit values from the measured solid color densities to correct the color space around the actual color location I in the L * measured on the multicolor measuring field.
  • a * b * - color space CIE 1976
  • the invention is explained on the basis of the L * a * b * color space, which represents a color system with equally spaced sensations, in which the same differences in the three coordinates (delta L * , delta a * or delta b * ) can be recognized equally well.
  • these deviations are not equivalent for the print quality assessment, since deviations in brightness (in the direction of the L * coordinate) have a less disturbing effect than deviations of the same size in the coordinates a * and b * assigned to the color.
  • the measured value processing 10 If it is determined in the measured value processing 10 that the actual color location of the area scanned by the color measuring device 42, in particular a color measuring field 41, on the printing sheet 40 does not correspond to the desired target color location S, which is caused, for example, by scanning a printing sheet which is found to be good or by direct data input is defined, the measured value processing 10 generates control data 11, which are entered via the control console 20 and cause the actuating signals 21 for the ink guide members of the printing press 30 in order to readjust the layer thicknesses of the printing inks on the printing sheet 40 and thus the solid densities so that when When the next printing sheet 40 is measured, the actual color locus I and the target color locus S collapse or at least approximate.
  • the color distance vectors are multiplied by the computer by a sensitivity matrix in order to calculate the layer thickness change control vector or the density change vector which must be taken into account the next time a printing sheet 40 is printed in order to achieve the desired color location shift.
  • the sensitivity matrix with which the density differences for the color locus shift between the target color locus S and the actual color locus I are calculated, can be determined empirically and by measurement using a test series.
  • FIG. 2 shows the L * a * b * color space with the color vector i for the actual color location I one on the printing sheet 40 scanned area, in particular a color measuring field 41, which can be a gray field or another grid field or solid field that is particularly adapted to the image content on the printing sheet 40, in order to simultaneously carry out an optimal correction of the color and brightness components.
  • a color measuring field 41 which can be a gray field or another grid field or solid field that is particularly adapted to the image content on the printing sheet 40, in order to simultaneously carry out an optimal correction of the color and brightness components.
  • the maximum permissible density differences delta Dy max and delta Dymn are shown in FIG. 2 for the correction vector y.
  • the maximum permissible density differences result from the differences between the actual density D ist and the permissible limit densities D max and Dmn for the printing inks involved.
  • the limit values for the solid ink density result, for example, from the requirements for a sufficient relative pressure contrast.
  • the correction vectors c, m and y span the correction color space 50 around the current actual color location I. Although they are usually not at right angles to one another, this is shown in FIG. 2 for the sake of simplicity. In addition, it is assumed that within a sufficiently small correction color space around the actual color location there is a linear approximation of the relationships between the color location coordinates and the densities.
  • target color locations S 1 to S 6 are shown in FIG. 2 to illustrate the control strategy according to the invention, each of which represents a special case and of which only one of the respectively predetermined target color location S is of course . that should have been achieved instead of the actual color locus I when printing the printed sheet 40.
  • the target color location S 1 whose color distance from the actual color location I is illustrated by the color distance vector 51, lies within the correction color space 50, which represents a control body.
  • the correction color space 50 which represents a control body.
  • Control strategies are explained below for those cases in which a target color location S cannot be achieved as a result of predetermined color density limits or other restrictions.
  • a replacement target color location i.e. achievable target color location S 'or S "can be controlled, which is characterized by a color disruption that is least disturbing to the viewer.
  • FIG. 2 shows how in this way an achievable desired color locus S is obtained at a target color locus S 2.
  • the achievable target color locus S lies on the intersection of the color distance vector 52 with the side surface 60 of the correction color space 50.
  • the strategy of choosing the piercing point of the color distance vector between the actual color locus and the target color location has the advantage of a simple calculation and is an approximation.
  • the recognizable distance in FIG. 2 between the target color location S 2 and the achievable target color location S represents the uncorrected or uncorrectable color distance. Since the target color location S 2 lies in a spatial area for whose spatial points there is a solder on the side surface 60, there is a smaller, non-correctable color difference corresponding to the length of the solder 62 on the side surface 60 if the base point is the target color location S that can be reached of the solder 62 is selected on the side surface 60. 2 shows the right angles and the plane 61 in which the solder 62 and the target color location S 2 and the target color location S which can be reached are located. In order not to stress the drawing too much, the color difference vector between the actual color location I and the attainable target color location S is not shown. If the attainable target color location S has been determined by means of the computer by analytically determining the minimum distance from the correction color space 50, the necessary density difference vector is calculated for this with the aid of the sensitivity matrix A.
  • the target color location S 4 in FIG. 2 lies at a point which does not permit the construction of a solder on a side surface or on an edge of the regulating body or correction color space 50. For this reason, the adjacent corner 80 of the correction color space 50 becomes the achievable target color location S. chosen because this point has the smallest distance of all points on the surface of the correction color space 50 from the target color location S 4 .
  • the distance between the thus determined attainable desired color location S from the actual target color point S 4 is illustrated in Fig. 2 by the connecting line 84, to illustrate the spatial position of the target FarbQrtes S 4 is shown a square 85, the diagonal of which is formed by the connecting line 84.
  • color component errors can be weighted and corrected more than the brightness errors.
  • the color component errors can be completely corrected, which is illustrated by the target color location S 5 in FIG. 2.
  • * by S 5 is a line parallel to the L - axis is constructed that the substantially upward in the direction of L * - axis oriented top surface 90 of the Correction color space 50 intersects and thereby defines the achievable target coloring point S.
  • the achievable target color locus S is shifted from the target color locus Ss to the top surface 90 in relation to the penetration point of a solder (not shown) in such a way that the color coordinates a * and b * of the achievable target color locus S match those of the target color locus S 5 match, it being accepted that an additional deviation in the brightness coordinate L * occurs compared to the choice of the point of penetration of the solder.
  • the color distance vector 95 between the target color location Ss and the achievable target color location S is longer than the solder of S 5 on the top surface 90, but its components for a * and b * are zero.
  • the control strategy according to the invention thus proposes to preferably try to reach the correction color space 50 starting from a target color location by determining an achievable target color location by shifting the actual target color location parallel to the L * axis.
  • the acceptable appearing brightness error to avoid color component errors to set limits and allow only a predetermined range of brightness error between delta L m and delta L max and within these regions corresponding to the already described above strategies each that point on the Search surface of the correction color space 50, which is as close as possible.
  • the compression of the L * coordinate can be combined with the search for a penetration point, plumb base or corner point.
  • FIG. 2 Such a case is illustrated in FIG. 2 with reference to the target color location S 6 , the position of which is spatially represented with the aid of a cuboid 96.
  • the closest corner 97 of the correction color space 50 is selected as the attainable target color locus, but the point S on the surface of the correction color space 50 that is located, while dealing with a larger brightness error against lower color component errors lies on a plane which extends parallel to the a * and b * coordinates at a distance from the target color location S 6 , which is defined by the largest permitted brightness error, and which is the smallest distance from the parallel to the L * axis by the Has target color locus S 6 .
  • the intersection of this plane with the parallel to the L * axis is provided in FIG. 2 with the reference symbol 98.
  • the attainable target color location S can also be determined such that, starting from the intersection 98, the base point of the solder on the edge 99 is determined in accordance with the strategy used for the target color location S 3 .
  • the person skilled in the art will recognize from the above explanations that the linear compression of the L * axis is not only possible separately, but also in combination with the constructions discussed on the basis of the target color locations S 2 , S 3 and S 4 .
  • the calculations required for this are carried out by the computer of the measured value processing of the printing system. Which strategy is chosen depends on the one hand on the relative position of the target color location S to the correction color space 50 and on the other hand on the type of measuring field and the objectives. It is useful if the operator of the printing system can specify the strategy to be selected in several ways.
  • the achievable target color location on the surface of the correction color space 50 is determined, this is selected for the control on the minimum color distance, the density difference vector being obtained according to the following equation:
  • AD c , AD m and ADy are the components of the full tone density change vector.
  • the components of the color distance vector between the actual color location and the attainable target color location are denoted by ⁇ L, ⁇ a and Ab.
  • the matrix containing the partial derivatives of the solid color densities according to the components of the color space is the sensitivity matrix A already mentioned.
  • the control strategies discussed can also be used for measuring fields in which fewer than three printing inks are printed.
  • the correction color space is reduced to a parallelogram and for a single-color field to a distance in the color space.
  • the registration strategies and calculations described above are applied analogously in such cases. All that needs to be done is to set the correction vectors of the non-existent colors to zero.
  • the target color locations are practically always outside of the area or section-shaped correction area. For this reason, the strategies discussed above for finding an achievable target color location are a prerequisite for optimal color control.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Spectrometry And Color Measurement (AREA)
EP88810844A 1987-12-16 1988-12-07 Procédé de commande ou du réglage de l'encrage d'une presse à imprimer Expired - Lifetime EP0321402B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4922/87 1987-12-16
CH492287 1987-12-16

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EP0321402A1 true EP0321402A1 (fr) 1989-06-21
EP0321402B1 EP0321402B1 (fr) 1991-10-16

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US (1) US4967379A (fr)
EP (1) EP0321402B1 (fr)
JP (1) JPH01208136A (fr)
DE (1) DE3865653D1 (fr)

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FR2643017A1 (fr) * 1989-02-10 1990-08-17 Heidelberger Druckmasch Ag Procede de reglage de la coloration de produits imprimes
EP0337148A3 (en) * 1988-04-12 1990-08-22 Heidelberger Druckmaschinen Aktiengesellschaft Method for controlling the inking in a printing press
EP0408507A1 (fr) * 1989-07-14 1991-01-16 GRETAG Aktiengesellschaft Méthode de détermination des écarts de couleur entre deux surfaces tramÀ©es imprimées avec une machine d'impression ainsi que méthode de commande ou réglage de l'impression couleurs d'une machine à imprimer
EP0421003A1 (fr) * 1989-10-02 1991-04-10 grapho metronic Mess- und Regeltechnik GmbH & Co. Méthode pour contrôler l'apport d'encre dans une machine d'impression
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EP0668164A1 (fr) * 1994-01-31 1995-08-23 Maschinenfabrik Wifag Acquisition des données de qualité dans une machine rotative offset pour feuilles
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JP5985241B2 (ja) * 2012-04-27 2016-09-06 株式会社ミマキエンジニアリング 印刷装置及び印刷方法
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EP0337148A3 (en) * 1988-04-12 1990-08-22 Heidelberger Druckmaschinen Aktiengesellschaft Method for controlling the inking in a printing press
FR2643017A1 (fr) * 1989-02-10 1990-08-17 Heidelberger Druckmasch Ag Procede de reglage de la coloration de produits imprimes
EP0408507A1 (fr) * 1989-07-14 1991-01-16 GRETAG Aktiengesellschaft Méthode de détermination des écarts de couleur entre deux surfaces tramÀ©es imprimées avec une machine d'impression ainsi que méthode de commande ou réglage de l'impression couleurs d'une machine à imprimer
EP0421003A1 (fr) * 1989-10-02 1991-04-10 grapho metronic Mess- und Regeltechnik GmbH & Co. Méthode pour contrôler l'apport d'encre dans une machine d'impression
DE4104537A1 (de) * 1991-02-14 1992-08-20 Grapho Metronic Gmbh & Co Verfahren zur regelung einer offset-druckmaschine
DE4104537C2 (de) * 1991-02-14 1999-05-12 Roland Man Druckmasch Verfahren zur Steuerung einer Farbführung einer Offset-Druckmaschine
US5540148A (en) * 1991-09-19 1996-07-30 Lintec Co., Ltd. Printing device and die-cutting device
EP0540430B1 (fr) * 1991-09-19 1997-12-29 LINTEC Corporation Dispositif d'impression et les méthodes pour détecter et corriger l'état et la position d'impression du dispositif d'impression
EP0705784A3 (fr) * 1991-09-19 1996-12-18 Lintec Co Ltd Méthodes pour détecter et corriger la position d'impression du dispositif d'impression
DE4311132A1 (de) * 1992-04-28 1993-11-04 Heidelberger Druckmasch Ag Verfahren zur farbregelung/-steuerung in einer druckmaschine
EP0585740A1 (fr) * 1992-09-02 1994-03-09 MAN Roland Druckmaschinen AG Méthode pour la commande du processus d'impression dans une presse d'imprimerie à cliché trame en particulier une machine à imprimer offset à feuilles
US5365847A (en) * 1993-09-22 1994-11-22 Rockwell International Corporation Control system for a printing press
US5730470A (en) * 1994-01-31 1998-03-24 Maschinenfabrik Wifag Quality data collection in rotary offset printing of single editions
EP0676285A1 (fr) * 1994-01-31 1995-10-11 Maschinenfabrik Wifag Gestion des couleurs dans une machine rotative offset pour feuilles
US5761327A (en) * 1994-01-31 1998-06-02 Maschinenfabrik Wifag Group of measured fields for determining color data of a printed product
EP0668164A1 (fr) * 1994-01-31 1995-08-23 Maschinenfabrik Wifag Acquisition des données de qualité dans une machine rotative offset pour feuilles
DE4402784C2 (de) * 1994-01-31 2001-05-31 Wifag Maschf Messfeldgruppe und Verfahren zur Qualitätsdatenerfassung unter Verwendung der Messfeldgruppe
AT512440A1 (de) * 2012-01-20 2013-08-15 Ait Austrian Inst Technology Farbtreueprüfung
AT512440B1 (de) * 2012-01-20 2014-08-15 Ait Austrian Inst Technology Farbtreueprüfung
EP2618119A3 (fr) * 2012-01-20 2018-02-14 AIT Austrian Institute of Technology GmbH Vérification de la fidélité des couleurs

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DE3865653D1 (de) 1991-11-21
US4967379A (en) 1990-10-30
EP0321402B1 (fr) 1991-10-16
JPH01208136A (ja) 1989-08-22

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