EP1720705B1 - Method for controlling color on printing machines - Google Patents

Method for controlling color on printing machines Download PDF

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Publication number
EP1720705B1
EP1720705B1 EP05715317A EP05715317A EP1720705B1 EP 1720705 B1 EP1720705 B1 EP 1720705B1 EP 05715317 A EP05715317 A EP 05715317A EP 05715317 A EP05715317 A EP 05715317A EP 1720705 B1 EP1720705 B1 EP 1720705B1
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Prior art keywords
ink
color
location
determined
measured
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EP05715317A
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German (de)
French (fr)
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EP1720705A1 (en
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Peter Schramm
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Manroland AG
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Manroland AG
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    • 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

Definitions

  • the invention relates to a method for color control on printing presses.
  • the four scale colors black, cyan, magenta and yellow as well as possibly also special colors in the form of halftone dots are usually transferred onto the substrate for the autotypical se-tenant printing.
  • the colors involved in the autotypical se-tenant, namely the scale colors and the spot colors, are also referred to as process colors.
  • the halftone dots of the different colors may differ in size, and the halftone dots of the different colors may be applied to the substrate when printing with mutual overlap.
  • the generation of a desired color impression depends on various factors and is therefore extremely complex.
  • a variety of methods for color control on printing machines are already known from the prior art.
  • the methods known from the prior art for color control usually have several of the following disadvantages:
  • a first disadvantage of methods known from the prior art for color control is that the same for color control as measured values, the so-called area coverage need the colors involved in printing.
  • the determination of the area coverage is very complex and usually only inaccurately possible, because usually the actually located on the printed product area coverage differs from that on the printing plate and therefore can hardly be determined exactly, and because it is most important for image-sensitive pixels to surfaces which are not homogeneous in color within a paint spot to be measured. Procedures for color control, which need as the basis for calculating the area coverage, are therefore usually inaccurate.
  • a further disadvantage of color control methods known from the prior art is that some of the methods known from the prior art require spectral color values as measured values. The determination of spectral color values requires special sensors, whereby the execution of such methods is complicated and expensive. Furthermore, in color control methods, which rely on the determination of spectral color values, large amounts of data must be processed. Again, this is complicated and expensive.
  • a further disadvantage of color control methods known from the prior art is that they are generally based only on the four scale colors black, magenta, cyan and yellow and are not able to regulate autotypical se-tenants with spot colors. Furthermore, most color control methods known in the art have significant black control problems. These are but a few of the disadvantages of color control methods known in the art.
  • the present invention has the object to provide a novel method for color control on printing presses.
  • the color control process according to the invention has a large number of advantages over the processes known from the prior art. Thus, it is not necessary for the method according to the invention to determine the so-called area coverage, because it is inherently taken into account in the method according to the invention. Furthermore, the method according to the invention is based on the measurement of so-called standard color values, which, compared to the measurement of so-called spectral color values, enables a significant reduction in the amount of data to be handled. Furthermore, with the method according to the invention, in addition to the scale colors, it is also possible to reliably regulate special colors and thus all the process colors involved in the autotypic compression. Also the color Black, like all other process colors, can be reliably regulated.
  • At least one color spot is measured online during printing.
  • this color spot is a so-called image-important point of the print job.
  • the determined actual color location is a set of measured values that consists of three color values that are in one suitable system, preferably in the so-called Lab system.
  • the determined actual color location of the measured color spot is then compared for color control with the corresponding desired color location. If it is determined in this comparison that the actual color locus corresponds to the desired color locus or lies within certain tolerance limits around this desired color locus, the process parameters can be further printed without any change. If, on the other hand, it is determined that the determined actual color locus deviates from the corresponding desired color locus, color control is carried out.
  • Fig. 1 visualizes the two steps or stages 10, 11 of the method according to the invention.
  • the ink feed of a single process color involved in the autotypic se-tenant is preferably changed during printing.
  • corresponding measured values representing the effect of the adjustment of this one color on the color values of the color locus are stored.
  • step 15 After changing the ink supply for a single process color in the sense of blocks 12, 13 and 14 and determining and storing the effect of this change on the color values of the color location of the color patch to be measured, it is checked in step 15 whether by adjusting the ink supply of the one Color of the desired target color location can be achieved can. If this is the case, it is possible to branch directly to block 16. However, if it is determined that the desired target color location can not be achieved, then it is further checked whether other process colors are involved in the execution of the print job.
  • the first step or the first step 10 of the color control method according to the invention represents a learning step, so to speak, in which it is determined how the adjustment of a single process color has an effect.
  • the system branches to block 16 and thus the second stage 11 of the method according to the invention.
  • a color location changes upon adjustment of each individual color in the corresponding color system in particular in the Lab system.
  • This can Fig. 2 are taken in the designated by the reference numeral 20 a measured color location before the adjustment of a color and the reference numeral 21 of the color location after adjustment of this color. So the color locus is 20 in the Lab system of Fig. 2 by coordinates (0.3, 0.3) and the color locus 21 is indicated by coordinates (0.42, 0.38).
  • a color vector 22 which is characteristic of the effect of the change of a color on the color values of the color patch to be measured, and which is stored as a corresponding measured value set or color locus for that color.
  • a color vector is determined in the first stage 10 of the method.
  • the second stage 11 of the method can then be calculated by simple vector addition of the determined in the first stage 10 color vectors, as the simultaneous change of several colors affects the color location.
  • the determination of the effect of changing the ink supply of each individual color on the color location in the sense of the first stage 10 of the method according to the invention can be carried out in two different ways.
  • a first alternative of the method according to the invention upon adjustment of the ink feed of a single color, it is possible to wait until the ink is in equilibrium after the adjustment. After reaching this state of equilibrium is then by the adjustment of the color caused change in the color locus determined as the corresponding color vector.
  • the extrapolation has the advantage that corresponding measured values can be determined much faster than in the case in which one waits until an equilibrium state is reached.
  • the result which is established on the basis of the control carried out in block 16 is checked. In this case, it is checked whether the color values of the color locus which adjusts after the regulation correspond to the result precalculated in block 16. If a significant deviation is detected, the vector addition carried out in block 16 can be adjusted, for example, by correcting the direction and size of the individual vectors on the basis of the present result.
  • the learning phase 10 of the method according to the invention is preferably executed only once during the printing of a print job. If control deviations occur when the same print job is executed, the control can be based on the variables learned once in step 10.
  • the desired color values required for control can either be known from the prepress stage and can be automatically provided to the inventive method as an input variable, or can be determined by means of a manual or control system-supported setup phase on the printing press.
  • the method according to the invention is subdivided in principle into two stages, namely a learning level and the actual control level.
  • the learning step the ink feed is adjusted individually for each process color involved in the printing, and the resulting effect on the color location is determined vectorially.
  • these determined vector variables are superimposed by vector addition in order to predict the effect of a simultaneous adjustment of several or all of the colors involved in the printing.

Abstract

A method for color correction in printing machines uses a learning process to determine the effects of changing colors. In a first stage of the method, the color supply of only a single process color is changed. The effect of changing the color supply of this one process color on the color values of a color spot to be measured is determined, and a corresponding chromaticity position is stored as a measurement value or measurement value set for this color. This-process can be performed separately one after the other for each individual process color involved in the autotype combination printing. In a second stage, all of the measurement values determined and stored earlier for all of the involved process colors are balanced with each other, such that for further color correction, a few or all of the process colors involved in the printing can be adjusted simultaneously.

Description

Die Erfindung betrifft ein Verfahren zur Farbregelung an Druckmaschinen.The invention relates to a method for color control on printing presses.

[Stand der Technik][State of the art]

Zur ordnungsgemäßen Ausführung eines Druckauftrags ist es unter anderem erforderlich, die in einer sogenannten Druckvorstufe festgelegte, farbliche Gestaltung eines zu druckenden Erzeugnisses während des eigentlichen Druckens korrekt auf einen Bedruckstoff zu übertragen. Hierzu werden für den autotypischen Zusammendruck in der Regel die vier Skalenfarben Schwarz, Cyan, Magenta und Gelb sowie gegebenenfalls auch Sonderfarben in Form von Rasterpunkten auf den Bedruckstoff übertragen. Die am autotypischen Zusammendruck beteiligten Farben, nämlich die Skalenfarben und die Sonderfarben, werden auch als Prozessfarben bezeichnet. Beim Drucken können zum Beispiel die Rasterpunkte der unterschiedlichen Farben sich in ihrer Größe unterscheiden, und die Rasterpunkte der unterschiedlichen Farben können beim Drucken mit gegenseitiger Überlappung auf den Bedruckstoff aufgetragen werden. Bereits hieraus folgt, dass die Erzeugung eines gewünschten Farbeindrucks von verschiedenen Faktoren abhängig und daher äußerst komplex ist.For the proper execution of a print job, among other things, it is necessary to correctly transfer the defined in a so-called prepress color design of a product to be printed during the actual printing on a substrate. For this purpose, the four scale colors black, cyan, magenta and yellow as well as possibly also special colors in the form of halftone dots are usually transferred onto the substrate for the autotypical se-tenant printing. The colors involved in the autotypical se-tenant, namely the scale colors and the spot colors, are also referred to as process colors. For example, when printing, the halftone dots of the different colors may differ in size, and the halftone dots of the different colors may be applied to the substrate when printing with mutual overlap. Already it follows that the generation of a desired color impression depends on various factors and is therefore extremely complex.

Aus dem Stand der Technik sind bereits eine Vielzahl von Verfahren zur Farbregelung an Druckmaschinen bekannt. Die aus dem Stand der Technik bekannten Verfahren zur Farbregelung verfügen dabei in der Regel über mehrere der folgenden Nachteile: Ein erster Nachteil von aus dem Stand der Technik bekannten Verfahren zur Farbregelung liegt darin, dass dieselben zur Farbregelung als Messwerte die sogenannte Flächendeckung der am Druck beteiligten Farben benötigen. Die Ermittlung der Flächendeckung ist sehr aufwändig und meist nur ungenau möglich, weil sich in der Regel die tatsächlich auf dem Druckerzeugnis befindliche Flächendeckung von der auf der Druckplatte unterscheidet und daher kaum exakt bestimmt werden kann, und weil es sich bei bildwichtigen Bildpunkten meistens um Flächen handelt, die innerhalb eines zu vermessenden Farbflecks farblich nicht homogen sind. Verfahren zur Farbregelung, welche als Berechnungsgrundlage die Flächendekkung benötigen, sind daher meist ungenau. Ein weiterer Nachteil von aus dem Stand der Technik bekannten Verfahren zur Farbregelung liegt darin, dass einige der aus dem Stand der Technik bekannten Verfahren als Messwerte spektrale Farbwerte benötigen. Die Ermittlung spektraler Farbwerte erfordert spezielle Messaufnehmer, wodurch die Ausführung solcher Verfahren aufwändig und teuer ist. Weiterhin müssen bei Farbregelungsverfahren, die auf die Ermittlung spektraler Farbwerte angewiesen sind, große Datenmengen verarbeitet werden. Auch dies ist aufwendig und teuer. Ein weiterer Nachteil von aus dem Stand der Technik bekannten Verfahren zur Farbregelung liegt darin, dass dieselben sich in der Regel nur an den vier Skalenfarben Schwarz, Magenta, Cyan und Gelb orientieren und nicht in der Lage sind, autotypische Zusammendrucke mit Sonderfarben zu regeln. Weiterhin haben die meisten aus dem Stand der Technik bekannten Verfahren zur Farbregelung erhebliche Probleme mit der Regelung der Farbe Schwarz. Dies sind nur einige der Nachteile von aus dem Stand der Technik bekannten Verfahren zur Farbregelung.A variety of methods for color control on printing machines are already known from the prior art. The methods known from the prior art for color control usually have several of the following disadvantages: A first disadvantage of methods known from the prior art for color control is that the same for color control as measured values, the so-called area coverage need the colors involved in printing. The determination of the area coverage is very complex and usually only inaccurately possible, because usually the actually located on the printed product area coverage differs from that on the printing plate and therefore can hardly be determined exactly, and because it is most important for image-sensitive pixels to surfaces which are not homogeneous in color within a paint spot to be measured. Procedures for color control, which need as the basis for calculating the area coverage, are therefore usually inaccurate. A further disadvantage of color control methods known from the prior art is that some of the methods known from the prior art require spectral color values as measured values. The determination of spectral color values requires special sensors, whereby the execution of such methods is complicated and expensive. Furthermore, in color control methods, which rely on the determination of spectral color values, large amounts of data must be processed. Again, this is complicated and expensive. A further disadvantage of color control methods known from the prior art is that they are generally based only on the four scale colors black, magenta, cyan and yellow and are not able to regulate autotypical se-tenants with spot colors. Furthermore, most color control methods known in the art have significant black control problems. These are but a few of the disadvantages of color control methods known in the art.

Aus dem Dokument US-5031534 ist ein Verfahren zur Farbregelung bekannt, wobei für jeweils eine Druckfarbe die Einstellung eines Wertepaares aus Volltondichte und Punktzuwachs ermitelt wirdFrom the document US 5031534 a method for color control is known, wherein for each ink, the setting of a value pair of solid density and dot gain is determined

[Aufgabe der Erfindung]OBJECT OF THE INVENTION

Hiervon ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde ein neuartiges Verfahren zur Farbregelung an Druckmaschinen zu schaffen.On this basis, the present invention has the object to provide a novel method for color control on printing presses.

Diese Aufgabe wird durch ein Verfahren zur Farbregelung an Druckmaschinen gemäß Patentanspruch 1 gelöst.This object is achieved by a method for color control on printing machines according to claim 1.

Das erfindungsgemäße Verfahren zur Farbreglung verfügt gegenüber den aus dem Stand der Technik bekannten Verfahren über eine Vielzahl von Vorteilen. So ist es für das erfindungsgemäße Verfahren nicht erforderlich, die sogenannte Flächendekkung zu ermitteln, weil dieselbe beim erfindungsgemäßen Verfahren immanent berücksichtig wird. Weiterhin beruht das erfindungsgemäße Verfahren auf der Messung sogenannter Normfarbwerte, was gegenüber der Messung sogenannter spektraler Farbwerte eine deutliche Reduzierung der handzuhabenden Datenmenge ermöglicht. Weiterhin können mit dem erfindungsgemäßen Verfahren neben den Skalenfarben auch Sonderfarben und damit alle am autotypischen Zusammendruck beteiligten Prozessfarben zuverlässig geregelt werden. Auch die Farbe Schwarz kann, wie alle anderen Prozessfarben, zuverlässig geregelt werden.The color control process according to the invention has a large number of advantages over the processes known from the prior art. Thus, it is not necessary for the method according to the invention to determine the so-called area coverage, because it is inherently taken into account in the method according to the invention. Furthermore, the method according to the invention is based on the measurement of so-called standard color values, which, compared to the measurement of so-called spectral color values, enables a significant reduction in the amount of data to be handled. Furthermore, with the method according to the invention, in addition to the scale colors, it is also possible to reliably regulate special colors and thus all the process colors involved in the autotypic compression. Also the color Black, like all other process colors, can be reliably regulated.

Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung.Preferred embodiments of the invention will become apparent from the dependent claims and the description below.

[Beispiele][Examples]

Ausführungsbeispiele der Erfindung werden, ohne hierauf beschränkt zu sein, an Hand der Zeichnung näher erläutert. Dabei zeigt:

Fig. 1:
ein Signalflussdiagramm zur Verdeutlichung des erfindungsgemäßen Verfahrens zur Farbregelung an Druckmaschinen;
Fig. 2:
eine Darstellung eines Farborts im sogenannten Lab-System zur Verdeutlichung des erfindungsgemäßen Verfahrens zur Farbregelung an Druckmaschinen.
Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:
Fig. 1:
a signal flow diagram to illustrate the method according to the invention for color control on printing machines;
Fig. 2:
a representation of a color locus in the so-called Lab system to illustrate the method according to the invention for color control on printing presses.

Nachfolgend wird das erfindungsgemäße Verfahren unter Bezugnahme auf Fig. 1 und 2 in größerem Detail beschrieben.Hereinafter, the method according to the invention with reference to Fig. 1 and 2 described in more detail.

Bei dem erfindungsgemäßen Verfahren zur Farbregelung wird während des Druckens mindestens ein Farbfleck online vermessen. Nachfolgend soll davon ausgegangen werden, dass lediglich ein derartiger Farbfleck vermessen wird, wobei es sich bei diesem Farbfleck um einen sogenannten bildwichtigen Punkt des Druckauftrags handelt.In the color control method according to the invention, at least one color spot is measured online during printing. In the following it should be assumed that only such a color spot is measured, whereby this color spot is a so-called image-important point of the print job.

Bei der Vermessung des Farbflecks wird ein Ist-Farbort ermittelt. Bei dem ermittelten Ist-Farbort handelt es ich um einen Messwertsatz, der aus drei Farbwerten besteht, die in einem geeigneten System, vorzugsweise im sogenannten Lab-System, dargestellt werden.When measuring the color spot, an actual color location is determined. The determined actual color location is a set of measured values that consists of three color values that are in one suitable system, preferably in the so-called Lab system.

Der ermittelte Ist-Farbort des vermessenen Farbflecks wird dann zur Farbregelung mit entsprechenden Soll-Farbort verglichen. Wird bei diesem Vergleich festgestellt, dass der Ist-Farbort dem Soll-Farbort entspricht bzw. innerhalb gewisser Toleranzgrenzen um diesen Soll-Farbort liegt, so kann ohne Veränderung der Prozessparameter weiter gedruckt werden. Wird hingegen festgestellt, dass der ermittelte Ist-Farbort von dem entsprechenden Soll-Farbort abweicht, so wird eine Farbregelung durchgeführt.The determined actual color location of the measured color spot is then compared for color control with the corresponding desired color location. If it is determined in this comparison that the actual color locus corresponds to the desired color locus or lies within certain tolerance limits around this desired color locus, the process parameters can be further printed without any change. If, on the other hand, it is determined that the determined actual color locus deviates from the corresponding desired color locus, color control is carried out.

Die erfindungsgemäße Farbregelung erfolgt in zwei Stufen bzw. Schritten. Fig. 1 visualisiert die beiden Schritte bzw. Stufen 10, 11 des erfindungsgemäßen Verfahrens.The color control according to the invention takes place in two stages or steps. Fig. 1 visualizes the two steps or stages 10, 11 of the method according to the invention.

In der ersten Stufe 10 des erfindungsgemäßen Farbregelungsverfahrens wird gemäß Block 12 zuerst lediglich die Farbzufuhr einer einzigen am autotypischen Zusammendruck beteiligten Prozessfarbe vorzugsweise während des Druckens verändert. Gemäß Block 13 wird sodann ermittelt, wie sich die Änderung in der Farbzufuhr dieser einen Farbe auf die Farbwerte des zu vermessenden Farbflecks auswirkt. Gemäß Schritt 14 werden entsprechende Messwerte, welche die Auswirkung der Verstellung dieser einen Farbe auf die Farbwerte des Farborts repräsentieren, gespeichert.In the first stage 10 of the color control method according to the invention, according to block 12, at first only the ink feed of a single process color involved in the autotypic se-tenant is preferably changed during printing. In block 13, it is then determined how the change in the ink supply of this one color affects the color values of the color patch to be measured. According to step 14, corresponding measured values representing the effect of the adjustment of this one color on the color values of the color locus are stored.

Nachdem im Sinne der Blöcke 12, 13 und 14 die Farbzufuhr für eine einzige Prozessfarbe verändert und die Auswirkung dieser Veränderung auf die Farbwerte des Farborts des zu vermessenden Farbflecks ermittelt und gespeichert worden ist, wird in Schritt 15 überprüft, ob durch Verstellung der Farbzufuhr dieser einen Farbe der gewünschte Soll-Farbort erzielt werden kann. Ist dies der Fall so kann unmittelbar auf Block 16 verzweigt werden. Wird jedoch festegestellt, dass der gewünschte Soll-Farbort nicht erzielt werden kann, so wird weiterhin überprüft, ob weitere Prozessfarben an der Ausführung des Druckauftrags beteiligt sind. Wird dabei festgestellt, dass noch weitere Farben vorhanden sind, für welche die Blöcke 12, 13 und 14 noch nicht durchgeführt wurden, so wird auf Block 12 zurückverzweigt und für jede einzelne Prozessfarbe wird getrennt und unabhängig von den anderen Prozessfarbe festgestellt, wie sich eine Verstellung in der Farbzufuhr dieser einen Farbe auf die Farbwerte des Farborts auswirkt.After changing the ink supply for a single process color in the sense of blocks 12, 13 and 14 and determining and storing the effect of this change on the color values of the color location of the color patch to be measured, it is checked in step 15 whether by adjusting the ink supply of the one Color of the desired target color location can be achieved can. If this is the case, it is possible to branch directly to block 16. However, if it is determined that the desired target color location can not be achieved, then it is further checked whether other process colors are involved in the execution of the print job. If it is found that there are still other colors for which the blocks 12, 13 and 14 have not yet been performed, then branched back to block 12 and for each process color is determined separately and independently of the other process color, as an adjustment in the color feed of that one color affects the color values of the color locus.

Der erste Schritt bzw. die erste Stufe 10 des erfindungsgemäßen Verfahrens zur Farbregelung stellt sozusagen eine Lernstufe dar, in welcher ermittelt wird, wie sich die Verstellung einer einzelnen Prozessfarbe auswirkt. Sobald in Block 15 festgestellt wird, dass die Blöcke 12, 13 und 14 für alle am Druck beteiligten Prozessfarben abgearbeitet worden sind, wird auf Block 16 und damit die zweite Stufe 11 des erfindungsgemäßen Verfahrens verzweigt.The first step or the first step 10 of the color control method according to the invention represents a learning step, so to speak, in which it is determined how the adjustment of a single process color has an effect. As soon as it is determined in block 15 that the blocks 12, 13 and 14 have been processed for all process colors involved in the printing, the system branches to block 16 and thus the second stage 11 of the method according to the invention.

In Block 16 der zweiten Stufe 11 des erfindungsgemäßen Verfahrens werden alle in der ersten Stufe 10 ermittelten und gespeicherten Messwerte bezüglich aller am Druck beteiligten Prozessfarben miteinander verrechnet, sodass zur weiteren Farbregelung einige oder alle am Druck beteiligten Farben gleichzeitig verstellt werden können. Nach Beendigung der ersten Stufe 10 und damit der Lernstufe ist nämlich bekannt, welche Auswirkungen die Verstellung einer jeden Prozessfarbe auf den Farbort hat. Aus diesen Werten kann durch mathematische Umrechnung dann geschlossen werden, welche Auswirkung die gleichzeitige Verstellung mehrerer am autotypischen Zusammendruck beteiligter Prozessfarben auf den Farbort hat.In block 16 of the second stage 11 of the method according to the invention, all measured values ascertained and stored in the first stage 10 are offset with respect to all process colors involved in the printing, so that some or all of the colors involved in the printing can be adjusted simultaneously for further color control. After completion of the first stage 10, and thus the learning level, it is known what effects the adjustment of each process color has on the color location. From these values it can then be concluded by mathematical conversion which effect the simultaneous adjustment of several process colors involved in the autotypical compression has on the color location.

Es sei an dieser Stelle darauf hingewiesen, dass in der ersten Stufe 10 des erfindungsgemäßen Verfahrens festgestellt wird, wie sich ein Farbort bei Verstellung einer jeden einzelnen Farbe im entsprechenden Farbsystem, insbesondere im Lab-System verändert. Dies kann Fig. 2 entnommen werden, in der mit der Bezugsziffer 20 ein vermessener Farbort vor der Verstellung einer Farbe und mit der Bezugsziffer 21 der Farbort nach Verstellung dieser Farbe beziffert ist. So ist der Farbort 20 im Lab-System der Fig. 2 durch Koordinaten (0,3; 0,3) und der Farbort 21 ist durch Koordinaten (0,42; 0,38) gekennzeichnet. Durch diese Koordinaten wird ein Farbvektor 22 bestimmt, der charakteristisch für die Auswirkung der Änderung einer Farbe auf die Farbwerte des zu vermessenden Farbflecks ist, und der als entsprechender Messwertsatz bzw. als Farbort für diese Farbe gespeichert wird. Vorzugsweise für jede am Druck beteiligte Prozessfarbe wird in der ersten Stufe 10 des Verfahrens ein derartiger Farbvektor ermittelt.It should be noted at this point that in the first stage 10 of the method according to the invention it is determined how a color location changes upon adjustment of each individual color in the corresponding color system, in particular in the Lab system. This can Fig. 2 are taken in the designated by the reference numeral 20 a measured color location before the adjustment of a color and the reference numeral 21 of the color location after adjustment of this color. So the color locus is 20 in the Lab system of Fig. 2 by coordinates (0.3, 0.3) and the color locus 21 is indicated by coordinates (0.42, 0.38). These coordinates are used to determine a color vector 22 which is characteristic of the effect of the change of a color on the color values of the color patch to be measured, and which is stored as a corresponding measured value set or color locus for that color. Preferably, for each process color involved in the printing, such a color vector is determined in the first stage 10 of the method.

In der zweiten Stufe 11 des Verfahrens kann dann durch einfache Vektoraddition der in der ersten Stufe 10 ermittelten Farbvektoren errechnet werden, wie sich die gleichzeitige Veränderung mehrerer Farben auf den Farbort auswirkt.In the second stage 11 of the method can then be calculated by simple vector addition of the determined in the first stage 10 color vectors, as the simultaneous change of several colors affects the color location.

Es sei darauf hingewiesen, dass die Ermittlung der Auswirkung der Veränderung der Farbzufuhr einer jeden einzelnen Farbe auf den Farbort im Sinne der ersten Stufe 10 des erfindungsgemäßen Verfahrens auf zwei unterschiedliche Art und Weisen ausgeführt werden kann. So kann nach einer ersten Alternative des erfindungsgemäßen Verfahrens bei Verstellung der Farbzufuhr einer einzelnen Farbe gewartet werden, bis sich die Farbe nach der Verstellung im Gleichgewicht befindet. Nach Erreichen dieses Gleichgewichtszustands wird dann die durch die Verstellung der Farbe bewirkte Änderung des Farborts als entsprechender Farbvektor ermittelt. Alternativ ist es auch möglich, nach einer bestimmten Zeitdauer einen oder in bestimmten Zeitintervallen mehrere Messwertsätze zu ermitteln und dann durch Extrapolation auf den sich einstellenden Gleichgewichtszustand zu schließen. Die Extrapolation verfügt über den Vorteil, dass sich entsprechende Messwerte wesentlich schneller ermitteln lassen als in dem Fall, in dem bis auf das Erreichen eines Gleichgewichtszustands gewartet wird.It should be noted that the determination of the effect of changing the ink supply of each individual color on the color location in the sense of the first stage 10 of the method according to the invention can be carried out in two different ways. Thus, according to a first alternative of the method according to the invention, upon adjustment of the ink feed of a single color, it is possible to wait until the ink is in equilibrium after the adjustment. After reaching this state of equilibrium is then by the adjustment of the color caused change in the color locus determined as the corresponding color vector. Alternatively, it is also possible after a certain period of time to determine one or at certain time intervals a plurality of measured value sets and then to conclude by extrapolation on the self-adjusting equilibrium state. The extrapolation has the advantage that corresponding measured values can be determined much faster than in the case in which one waits until an equilibrium state is reached.

Im Anschluss an den Block 16 wird im Block 17 vorzugsweise das sich auf Basis der in Block 16 durchgeführten Regelung einstellende Ergebnis überprüft. Dabei wird überprüft, ob die Farbwerte des sich nach der Regelung einstellenden Farborts dem in Block 16 vorberechneten Ergebnis entsprechen. Wird dabei eine erhebliche Abweichung festgestellt, so kann die in Block 16 durchgeführte Vektoraddition zum Beispiel dadurch angepasst werden, dass Richtung und Größe der einzelnen Vektoren auf Grundlage des vorliegenden Ergebnisses korrigiert werden.Subsequent to block 16, in block 17, preferably the result which is established on the basis of the control carried out in block 16 is checked. In this case, it is checked whether the color values of the color locus which adjusts after the regulation correspond to the result precalculated in block 16. If a significant deviation is detected, the vector addition carried out in block 16 can be adjusted, for example, by correcting the direction and size of the individual vectors on the basis of the present result.

Die Lernphase 10 des erfindungsgemäßen Verfahrens wird beim Drucken eines Druckauftrags vorzugsweise lediglich einmal durchlaufen. Treten bei Ausführung desselben Druckauftrags Regelabweichungen auf, so kann die Regelung auf Basis der einmal in der Stufe 10 erlernten Größen erfolgen. Die zur Regelung benötigten Soll-Farbwerte können entweder aus der Druckvorstufe bekannt sein und automatisch dem erfindungsgemaßen Verfahren als Eingangsgröße bereitgestellt werden, oder im Wege einer manuellen oder regelsystemgestützten Einrichtphase an der Druckmaschine ermittelt werden.The learning phase 10 of the method according to the invention is preferably executed only once during the printing of a print job. If control deviations occur when the same print job is executed, the control can be based on the variables learned once in step 10. The desired color values required for control can either be known from the prepress stage and can be automatically provided to the inventive method as an input variable, or can be determined by means of a manual or control system-supported setup phase on the printing press.

Es sei an dieser Stelle darauf hingewiesen, dass selbstverständlich auch nach Verstellung der Farbzufuhr einer einzigen Prozessfarbe das gewünschte Ergebnis, also der Soll-Farbort, erzielt werden kann. In diesem Fall wird in der ersten Stufe 10 zuerst einmal nur der Farbvektor für diese eine Farbe ermittelt und dann auf die zweite Stufe 11 umgeschaltet. Wenn sich aber im Lauf des Druckauftrags herausstellen sollte, dass sich der gewünschte Soll-Farbort durch Verstellen dieser einen Farbe nicht erzielen lässt, so kann auf die erste Stufe 10 rückverzweigt werden und der Lernschritt für eine oder mehrere weitere Prozessfarben durchgeführt werden.It should be noted at this point that, of course, even after adjustment of the ink supply of a single Process color the desired result, so the target color location can be achieved. In this case, in the first stage 10, first only the color vector for that one color is determined and then switched to the second stage 11. If, however, it should turn out in the course of the print job that the desired desired color location can not be achieved by adjusting this one color, it is possible to branch back to the first stage 10 and to carry out the learning step for one or more further process colors.

Mit Hilfe des erfindungsgemäßen Verfahrens ist eine besonders einfache Farbregelung an Druckmaschinen möglich. Das erfindungsgemäße Verfahren unterteilt sich prinzipiell zwei Stufen, nämlich eine Lernstufe sowie die eigentliche Regelungsstufe. In der Lernstufe wird für jede am Druck beteiligte Prozessfarbe die Farbzufuhr einzeln verstellt und die sich dabei einstellende Auswirkung auf den Farbort vektoriell bestimmt. Nachdem dies für jede am Druck beteiligte Prozessfarbe separat durchgeführt wurde, werden in einer zweiten Stufe des erfindungemäßen Verfahrens diese ermittelten, vektoriellen Größen durch Vektoraddition überlagert, um so die Wirkung einer gleichzeitigen Verstellung mehrerer oder aller am Druck beteiligten Farben vorauszuberechnen.With the aid of the method according to the invention, a particularly simple color control on printing presses is possible. The method according to the invention is subdivided in principle into two stages, namely a learning level and the actual control level. In the learning step, the ink feed is adjusted individually for each process color involved in the printing, and the resulting effect on the color location is determined vectorially. After this has been carried out separately for each process color involved in the printing, in a second stage of the method according to the invention these determined vector variables are superimposed by vector addition in order to predict the effect of a simultaneous adjustment of several or all of the colors involved in the printing.

Für das erfindungsgemäße Regelungsverfahren muss keine Flächendeckung ermittelt werden, weil diese immanente berücksichtigt wird. Mit dem erfindungsgemäßen Verfahren lassen sich am autotypischen Zusammendruck beteiligte Skalenfarben und Sonderfarben gleichermaßen zuverlässig regeln. Da das erfindungsgemäße Verfahren auf der Ermittlung von Normfarbwerten beruht, kann es mit geringem Rechenaufwand durchgeführt werden.For the control method according to the invention no area coverage must be determined because this immanent is taken into account. With the method according to the invention, it is equally possible to regulate scale colors and spot colors involved in the autotypic compression in an equally reliable manner. Since the method according to the invention is based on the determination of standard color values, it can be carried out with little computational effort.

[Bezugszeichenliste][REFERENCE LIST]

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Claims (7)

  1. A method for the ink control on printing machines with the following steps:
    a) for the ink control only the ink feed of a single process ink is changed in a first step or in a first step of the method, wherein it is determined here how the change in the ink feed of this one process ink affects ink values of an ink stain to be measured, wherein a corresponding measured value set is stored as ink vector (22) between an ink location (20) before the change of the ink feed and an ink location (21) after the change of the ink feed for the ink of the ink stain, and wherein this is performed separately in succession for each individual process ink involved in the autotypical combined print,
    b) for the ink control all measured values of all process inks involved determined and stored in connection with Step a) are offset against one another in a second step or in a second step of the method in such a way that for further ink control some or all process inks involved in the print are adjusted at the same time.
  2. The method according to Claim 1, characterised in that during the printing at least one ink stain is measured, wherein during this measurement at least one actual ink location is determined and that the or each determined actual ink location is compared with a corresponding set ink location, wherein upon a deviation between the actual ink location and the corresponding set ink location the ink control is carried out.
  3. The method according to Claim 1 or 2, characterised in that determining the measured values of the or each ink location in Step a) is delayed until a state of equilibrium after the change in the ink feed of the respective ink to be printed is reached.
  4. The method according to Claim 1 or 2, characterised in that for determining the measured values of the or each ink location in Step a) after a certain period of time or at certain time intervals at least one value is measured and the ensuing state of equilibrium is deduced through extrapolation.
  5. The method according to one or several of the Claims 1 to 4, characterised in that in Step a) for each process ink to be printed measurements are performed separately and one after the other in time to determine the effect of the isolated change of the ink feed of each process ink on the ink location of the ink stain to be measured, especially an ink vector.
  6. The method according to Claim 5, characterised in that in the process it is determined how on changing the ink feed of each process ink the corresponding ink location shifts, and that from the ink location present before the ink adjustment and after the ink adjustment, size and direction of an ink vector are determined.
  7. The method according to one or several of the Claims 1 to 6, characterised in that the offsetting of the measured values determined and stored according to Step b) is effected through vector operations, wherein for this purpose the ink vectors determined in Step a) for each individual process ink are preferentially superimposed through vector addition.
EP05715317A 2004-02-26 2005-02-12 Method for controlling color on printing machines Not-in-force EP1720705B1 (en)

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DE102004009271A DE102004009271A1 (en) 2004-02-26 2004-02-26 Method for color control on printing machines
PCT/EP2005/001438 WO2005082620A1 (en) 2004-02-26 2005-02-12 Method for controlling color on printing machines

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EP1720705A1 EP1720705A1 (en) 2006-11-15
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CN112146759B (en) * 2020-09-17 2023-05-05 杭州临安银杏装饰材料有限公司 On-line monitoring method for color change of intaglio decorative paper

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CN100436130C (en) 2008-11-26
CN1922014A (en) 2007-02-28
US20070188778A1 (en) 2007-08-16
JP2007523775A (en) 2007-08-23
ATE468975T1 (en) 2010-06-15
DE102004009271A1 (en) 2005-09-15
DE502005009635D1 (en) 2010-07-08
EP1720705A1 (en) 2006-11-15
WO2005082620A1 (en) 2005-09-09

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