EP1033247B1 - Method for controlling colour in a printing machine - Google Patents
Method for controlling colour in a printing machine Download PDFInfo
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- EP1033247B1 EP1033247B1 EP00103191A EP00103191A EP1033247B1 EP 1033247 B1 EP1033247 B1 EP 1033247B1 EP 00103191 A EP00103191 A EP 00103191A EP 00103191 A EP00103191 A EP 00103191A EP 1033247 B1 EP1033247 B1 EP 1033247B1
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- Prior art keywords
- printing
- machine according
- printing machine
- coloration
- controlling
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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
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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 controlling the coloring of a printing press.
- the desired color tones of the reproductions are produced on the substrate by overprinting a small number of primary colors.
- the hue is mainly dependent on the intrinsic color of the substrate, the layer thickness and the degree of screening of the primary colors used in the overprint and the so-called dot gain.
- the rasterization is set in the prepress stage and represents the desired degree of attenuation of the color impression of the pure base color at each image location in compression.
- the tone value increase alters this originally desired attenuation due to mechanical and optical action mechanisms, e.g. the grid points are flattened, causing a visually higher tone value.
- this can be observed and compensated for in the pre-press, so that the desired tonal value is created again during printing.
- Problematic are the trend or random variations of dot gain occurring in printing.
- the layer thicknesses of the primary colors serve as a constant parameter in the screening of the individual colors in the prepress stage, so they normally have to remain in precisely defined tolerance ranges. For the reason explained above, a constant deviation of the solid density may be necessary during later printing in order to achieve on average acceptable deviations in the subject.
- the measurement of the layer thicknesses of the pure primary colors takes place on so-called full-tone control surfaces by densitometers which determine the ratio of irradiated to reflected light in wavelength ranges defined by a DIN standard.
- the density value for SCHWARZ (English “Key”, short name “K”) is usually calculated mathematically from the three independent density values. However, even in the case of a measurement with its own black channel, it does not constitute useful information because there is no specific spectral range for "black” other than the near infrared, and the black filter is basically a broadband filter is.
- the CMY densities therefore represent a triple or even vector of density values waiving a value for black.
- Color measurement devices with 3 filter channels (tristimulus) on the basis of the eye sensitivity curves are used to measure the hues, especially in combination printing.
- Modern measuring devices also use spectrophotometers with more than 30 channels, which simulate eye sensitivity by mathematical treatment of the measured values in the channels.
- a disadvantage of this method is u.a. the effort to produce the proofs and the use of the absolute proportions to control the coloring, since in this way no colors can be compared based on different printing methods.
- the object of the invention is to provide a method for accurate and rapid statement about the size and direction of the layer thickness changes of the participating primary colors.
- the invention will be described on an exemplary embodiment decorative printing of wood wallpaper.
- the decor print consists of the combination of three primary colors, two of which are very similar; Measuring strips for zonal measurement and control of the layer thickness do not exist.
- Color One takes over the pressure of the basic color tone.
- Color Two contains the same pigments as Color One, but at a higher concentration, and is responsible for most of the grains. The spectrum of color two is therefore derivable by a factor from the spectrum of color one.
- Color Three can not be deduced from the spectra of color one and color two. This color takes over the printing of other picture elements like leaves, grass etc.
- Picture 1 contains the pixel-wise RGB-values of excerpt 1, picture 2 the of excerpt 2 etc.
- the picture-pixels contain the required quantitative information "RGB" and the position information about their arrangement in the picture. This includes the image contrasts, edges or grains in the printed subject.
- the pixels of the entire arc can be included in the decomposition.
- the pixels from each of the respective zones can be taken into account in a system of equations.
- the control information from the decomposition factors is calculated individually for each zone.
- the control information "full tone density changes" is then the product of colorwise decomposition factor and the assigned solid density.
- the decomposition into decomposition factors does not take place or not exclusively by the solution of equations but by simulation of the combined pressure. For example, 100,000 variants are calculated by calculation. The variant with the best quality (depending on the criterion) is chosen. Although the computing time limits the possible solutions, there is the advantage that any models (including Fuzzy models) can be used with any boundary conditions.
- the measurement is preferably carried out with an automatic measuring system at all desired image locations. As described, an RGB camera or a combined measuring head is used to measure spectra with more than 30 channels
- the image data obtained during the measurement are collected in a processing unit. Thereafter, the difference of the data to the measured or calculated target data takes place.
- the differences are divided into the individual colors involved in the printing at the measuring point, eg according to the principle of the smallest deviation squares.
- the differences are represented component by component as sums of products from coefficients with values of the individual inks, with area coverage values and empirical weighting factors in the form of a system of equations.
- the coefficients result after the solution of the system of equations by methods of calculation known per se.
- the coefficients are then converted into curves by means of characteristic curves Volltonêtêtnnen and then converted into slider changes the zone inking unit.
- boundary conditions in particular solid density or layer thickness
- the current full-tone density value is necessary. This value comes from a special measuring field eg in a measuring strip or by evaluation (profile scan) of a single grid point.
- the consideration of boundary conditions allows the limitation of the control movements to layer thickness ranges, in which the offset printing still works. (0.6-1.3 ⁇ m).
- the acquisition of the boundary conditions can be done by video image analysis of individual halftone dots and evaluation of the precursor information at this image location. Leaving the offsetting typical image area is absolutely clear in the 1000-fold magnification of halftone dots.
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- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Color, Gradation (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Steuerung der Farbgebung an einer Druckmaschine.The invention relates to a method for controlling the coloring of a printing press.
Beim Offsetdruck werden die gewünschten Farbtöne der Reproduktionen auf dem Bedruckstoff durch Übereinanderdruck einer geringen Zahl von Grundfarben hergestellt. Der Farbton ist in der Hauptsache abhängig von der Eigenfarbe des Bedruckstoffes, von der Schichtdicke und dem Grad der Rasterung der verwendeten Grundfarben im Übereinanderdruck sowie der sogenannten Tonwertzunahme. Die Rasterung wird in der Druckvorstufe festgelegt und stellt den gewünschten Grad der Abschwächung des Farbeindruckes der reinen Grundfarbe an jeder Bildstelle im Zusammendruck dar. Die Tonwertzunahme verändert diese ursprünglich gewünschte Abschwächung aufgrund mechanischer und optischer Wirkungsmechanis-men, indem z.B. die Rasterpunkte flachgedrückt werden und damit einen visuell höheren Tonwert verursachen. Dies kann jedoch in der Druckvorstufe beachtet und kompensiert werden, so dass im Druck wieder der gewünschte Tonwert entsteht. Problematisch sind die im Druck auftretenden trendmäßigen oder zufälligen Schwankungen der Tonwertzunahme.In offset printing, the desired color tones of the reproductions are produced on the substrate by overprinting a small number of primary colors. The hue is mainly dependent on the intrinsic color of the substrate, the layer thickness and the degree of screening of the primary colors used in the overprint and the so-called dot gain. The rasterization is set in the prepress stage and represents the desired degree of attenuation of the color impression of the pure base color at each image location in compression. The tone value increase alters this originally desired attenuation due to mechanical and optical action mechanisms, e.g. the grid points are flattened, causing a visually higher tone value. However, this can be observed and compensated for in the pre-press, so that the desired tonal value is created again during printing. Problematic are the trend or random variations of dot gain occurring in printing.
Trendmäßige Abweichungen auf Grund maschinentechnischer Eigenschaften können nur über Änderungen der Schichtdicken der Grundfarben entsprechend eines gewählten Gütekriteriums ausgeglichen werden. Gegen kurzfristige zufällige Abweichungen gibt es keine Abhilfe, sie bilden das Äquivalent zum Rauschen in elektronischen Verstärkern und müssen bei der Festlegung von Toleranzen berücksichtigt werden.Trendy deviations due to technical properties can only be compensated by changes in the layer thicknesses of the primary colors according to a selected quality criterion. There is no remedy for short-term random deviations, they are the equivalent of noise in electronic amplifiers and must be taken into account when specifying tolerances.
Die Schichtdicken der Grundfarben dienen bei der Rasterung der Einzelfarben in der Druckvorstufe als konstanter Parameter, daher müssen sie normalerweise in genau bestimmten Toleranzbereichen verbleiben. Aus dem zuvor erläuterten Grund kann beim späteren Druck eine konstante Abweichung der Volltondichte notwendig sein, um im Mittel akzeptable Abweichungen im Sujet zu erreichen.
Die Messung der Schichtdicken der reinen Grundfarben erfolgt auf sogenannten Vollton-Kontrollflächen durch Densitometer, die in, durch eine DIN-Norm, festgelegten Wellenlängenbereichen das Verhältnis von eingestrahltem zum reflektierten Licht bestimmen. Interessant sind nur die Kanäle für CYAN, MAGENTA und GELB, deren englische Anfangsbuchstaben "C","M","Y", als Bezeichnung für die Messkanäle dienen. Der Dichtewert für SCHWARZ (englisch "Key", Kurzbezeichnung "K") wird in der Regel mathematisch aus den drei unabhängigen Dichtewerten berechnet. Er stellt aber auch im Fall einer Messung mit einem eigenen Schwarzkanal keine verwertbare Information dar, weil es keinen spezifischen Spektralbereich für "Schwarz" abgesehen vom nahen Infrarot gibt und der Schwarzfilter im Grundsatz ein Breitbandfilter ist. Die CMY-Dichten stellen daher ein Tripel oder auch Vektor von Dichtewerten unter Verzicht eines Wertes für Schwarz dar.The layer thicknesses of the primary colors serve as a constant parameter in the screening of the individual colors in the prepress stage, so they normally have to remain in precisely defined tolerance ranges. For the reason explained above, a constant deviation of the solid density may be necessary during later printing in order to achieve on average acceptable deviations in the subject.
The measurement of the layer thicknesses of the pure primary colors takes place on so-called full-tone control surfaces by densitometers which determine the ratio of irradiated to reflected light in wavelength ranges defined by a DIN standard. Interesting are only the channels for CYAN, MAGENTA and YELLOW, whose English initials "C", "M", "Y", serve as a name for the measurement channels. The density value for SCHWARZ (English "Key", short name "K") is usually calculated mathematically from the three independent density values. However, even in the case of a measurement with its own black channel, it does not constitute useful information because there is no specific spectral range for "black" other than the near infrared, and the black filter is basically a broadband filter is. The CMY densities therefore represent a triple or even vector of density values waiving a value for black.
Zur Messung der Farbtöne insbesondere im Zusammendruck dienen Farbmessgeräte mit 3 Filterkanälen (Tristimulus) auf der Basis der Augenempfindlichkeitskurven. Moderne Messgeräte verwenden auch Spektralfotometer mit mehr als 30 Kanälen, die durch rechnerische Behandlung der Messwerte in den Kanälen die Augenempfindlichkeit nachbilden.Color measurement devices with 3 filter channels (tristimulus) on the basis of the eye sensitivity curves are used to measure the hues, especially in combination printing. Modern measuring devices also use spectrophotometers with more than 30 channels, which simulate eye sensitivity by mathematical treatment of the measured values in the channels.
Aus der Patentschrift
Nachteilig an diesem Verfahren ist u.a. der Aufwand zur Erstellung der Probedrucke und die Verwendung der absoluten Anteile zur Steuerung der Farbgebung, da auf diese Weise keine Farben verglichen werden können, die auf unterschiedlichen Druckverfahren basieren.A disadvantage of this method is u.a. the effort to produce the proofs and the use of the absolute proportions to control the coloring, since in this way no colors can be compared based on different printing methods.
Aus der
Aus der
Alle vorstehend genannten Verfahren haben den Nachteil, dass sie versagen, wenn auch nur eine der nachstehenden Bedingungen erfüllt ist:
- mindestens 2 Grundfarben haben dasselbe Spektrum bzw. eines der beteiligten Spektren kann aus einer Linearkombination der übrigen Spektren dargestellt werden
- bildwichtige Messstellen sind so kontrastreich im Bereich der geometrischen Auflösung des Sensors, so dass kleinste Lageänderungen des Messortes große Messwertschwankungen zur Folge haben
- at least 2 primary colors have the same spectrum or one of the spectra involved can be represented from a linear combination of the remaining spectra
- Image-critical measuring points are so rich in contrast in the range of the geometric resolution of the sensor, so that the smallest changes in position of the measuring location have large fluctuations in the measurement result
Aufgabe der Erfindung ist die Schaffung eines Verfahrens zur zutreffenden und schnellen Aussage über die Größe und Richtung der Schichtdickenänderungen der beteiligten Grundfarben.The object of the invention is to provide a method for accurate and rapid statement about the size and direction of the layer thickness changes of the participating primary colors.
Gelöst wird diese Aufgabe durch ein Verfahren gemäß den Merkmalen von Patentanspruch 1.This object is achieved by a method according to the features of claim 1.
Nachfolgend wird die Erfindung an einem Ausführungsbeispiel Dekordruck von Holztapeten beschrieben. Der Dekordruck besteht aus dem Zusammendruck von drei Grundfarben, von denen zwei sehr ähnlich sind; Messstreifen zur zonalen Messung und Regelung der Schichtdicke existieren nicht.The invention will be described on an exemplary embodiment decorative printing of wood wallpaper. The decor print consists of the combination of three primary colors, two of which are very similar; Measuring strips for zonal measurement and control of the layer thickness do not exist.
Farbe Eins übernimmt den Druck des Grundfarbtones. Farbe Zwei enthält die selben Pigmente wie Farbe Eins, jedoch in höherer Konzentration, und ist zuständig für den Großteil der Maserungen. Das Spektrum von Farbe Zwei ist daher über einen Faktor aus dem Spektrum von Farbe Eins ableitbar. Farbe Drei lässt sich nicht aus den Spektren von Farbe Eins und Farbe Zwei ableiten. Diese Farbe übernimmt den Druck anderer Bildelemente wie Blätter, Gras etc..Color One takes over the pressure of the basic color tone. Color Two contains the same pigments as Color One, but at a higher concentration, and is responsible for most of the grains. The spectrum of color two is therefore derivable by a factor from the spectrum of color one. Color Three can not be deduced from the spectra of color one and color two. This color takes over the printing of other picture elements like leaves, grass etc.
Wegen der Ähnlichkeit von Farbe Eins und Farbe Zwei kann keines der im Stand der Technik genannten Verfahren eine korrekte Aussage darüber geben, ob die deutlich sichtbaren Farbdifferenzen zwischen dem vom Kunden abgezeichneten Proof und dem aktuellen Druckergebnis aus dem Farbwerk Eins, Zwei oder Drei bzw. einer Kombination daraus stammen.Because of the similarity of color one and color two none of the methods mentioned in the prior art can give a correct statement as to whether the clearly visible color differences between the customer signed proof and the current printing result from the inking unit one, two or three or one Combination come from.
Aus diesem Grunde werden quantitative Informationen und Lageinformationen in die Ermittlung der Steuerinformationen einbezogen. Deshalb wird mit einer RGB-Kamera von jedem der Einzelfarbauszüge des aktuellen Druckes ein Bild aufgenommen. Alternativ können diese Auszüge auch durch die Druckvorstufe geliefert werden, was den Aufwand drucktechnischen Herstellung der Farbauszuges einspart. Bild 1 enthält die pixelweisen RGB-Werte von Auszug 1, Bild 2 die von Auszug 2 usw.. Die Bild-Pixel enthalten die geforderten quantitativen Informationen "RGB" und die Lageinformationen über ihre Anordnung im Bild. Darin sind auch die Bildkontraste, Kanten oder Maserungen im gedruckten Sujet enthalten.For this reason, quantitative information and location information are included in the determination of the control information. Therefore, an image is taken with an RGB camera from each of the single color separations of the current print. Alternatively, these extracts can also be supplied by the pre-press, which saves the expense of printing technology production of the color separation. Picture 1 contains the pixel-wise RGB-values of excerpt 1, picture 2 the of excerpt 2 etc. The picture-pixels contain the required quantitative information "RGB" and the position information about their arrangement in the picture. This includes the image contrasts, edges or grains in the printed subject.
Nun erfolgt eine formelmäßige oder Lookup-Tabellen-basierte Transformation der pixelweisen RGB-Werte in eine logarithmierte Wertedarstellung, die eine Linearkombination erlaubt. Bei der Aufnahme von pixelweisen Dichtespektren oder Dichtewerten kann diese Transformation entfallen, denn diese Werte sind bereits linear kombinierbar.
Sodann erfolgt eine Linearzerlegung der pixelweisen Differenz zwischen Istbild und Sollbild, z.B. während des Abstimmprozesses, in Zerlegungsfaktoren. Die Zerlegungsfaktoren sind die Lösung der folgenden Gleichung, wobei jeder der N Pixel berücksichtigt wird. Es gibt daher N Gleichungen mit 3 Unbekannten. Die Lösungen für K1, K2 und K3 stellen die Gewichtungen der Zerlegungen dar. Beim Anilox- oder Tiefdruck können die Pixel des gesamten Bogens in die Zerlegung einbezogen werden. Beim Zonenfarbwerk im Offsetdruck können die Pixel aus jeweils der betreffenden Zone in einem Gleichungssystem berücksichtigt werden. Die Steuerinformation aus den Zerlegungsfaktoren wird für jede Zone individuell errechnet.Now, a formula-based or look-up-table-based transformation of the pixel-by-pixel RGB values into a logarithmized value representation that allows a linear combination. In the This transformation can be omitted by recording pixel-wise density spectra or density values, since these values can already be combined linearly.
Then there is a linear decomposition of the pixel-by-pixel difference between the actual image and the target image, eg during the tuning process, in decomposition factors. The decomposition factors are the solution of the following equation, taking into account each of the N pixels. There are therefore N equations with 3 unknowns. The solutions for K1, K2 and K3 represent the weights of the decompositions. In anilox or gravure printing, the pixels of the entire arc can be included in the decomposition. In the zone inking unit in offset printing, the pixels from each of the respective zones can be taken into account in a system of equations. The control information from the decomposition factors is calculated individually for each zone.
Die Zerlegungsfaktoren können auch als Volltondichteänderungen dargestellt werden.
Dazu sind die Farbwerkgrundvorlagen in Dichtewerten zu kalibrieren, indem einer Farbwerkgrundvorlage (=Farbauszug) die Volltondichte durch Messung oder Berechnung zugeordnet wird.The decomposition factors can also be represented as solid density changes.
To do this, calibrate the ink master masters in density values by assigning the full-tone density to a basic color master (= color separation) by measurement or calculation.
Die Steuerinformation "Volltondichteänderungen" ist dann das Produkt aus farbwerksweisem Zerlegungsfaktor und der zugeordneten Volltondichte.
Die Zerlegung in Zerlegungsfaktoren erfolgt nicht oder nicht ausschließlich über die Lösung von Gleichungen sondern durch Simulation des Zusammendruckes.
Dabei werden z.B. 100000 Varianten rechnerisch durchgespielt. Die Variante mit der besten Güte (je nach Kriterium) wird gewählt. Obwohl die Rechenzeit die Lösungsmöglichkeiten begrenzt, besteht der Vorteil, dass beliebige Modelle (auch FUZZY-Modelle) mit beliebigen Randbedingungen verwendet werden können.
Die Messung erfolgt vorzugsweise mit einem automatischen Meßsystem an allen gewünschten Bildstellen. Dazu dient, wie beschrieben, eine RGB-Kamera oder ein kombinierter Messkopf für die Messung von Spektren mit mehr als 30 KanälenThe control information "full tone density changes" is then the product of colorwise decomposition factor and the assigned solid density.
The decomposition into decomposition factors does not take place or not exclusively by the solution of equations but by simulation of the combined pressure.
For example, 100,000 variants are calculated by calculation. The variant with the best quality (depending on the criterion) is chosen. Although the computing time limits the possible solutions, there is the advantage that any models (including Fuzzy models) can be used with any boundary conditions.
The measurement is preferably carried out with an automatic measuring system at all desired image locations. As described, an RGB camera or a combined measuring head is used to measure spectra with more than 30 channels
Die während der Messung anfallenden Bilddaten werden in einer Verarbeitungseinheit gesammelt. Danach erfolgt die Differenzbildung der Daten zu den gemessenen oder errechneten Solldaten. Bei Überschreiten eines aus den Differenzen gebildeten Gütekriteriums erfolgt die Aufteilung der Differenzen in die an der Messstelle im Druck beteiligten Einzelfarben z.B. gemäß des Prinzips der kleinsten Abweichungsquadrate. Die Differenzen werden dabei komponentenweise als Summen von Produkten aus Koeffizienten mit Werten der Einzeldruckfarben, mit Flächendeckungswerten und empirischen Wichtungsfaktoren in Form eines Gleichungssystems dargestellt. Die Koeffizienten ergeben sich nach der Lösung des Gleichungssystems durch an sich bekannte Rechenverfahren. Die Koeffizienten werden danach mittels Kennlinien in entsprechende Volltondichteänderungen und anschließend in Schieberänderungen des Zonenfarbwerkes umgerechnet. Dabei sind insbesondere dann unendlich viele verschiedene Lösungen des Gleichungssystems möglich, wenn eine oder mehrere Druckfarben in allen Spektralbereichen hohe Dichtewerte besitzen. Es wird dann diejenige Aufteilung gewählt, die entsprechend eines erweiterten Gütekriteriums die optimale Schichtdicke des Offsetdruckes am wenigsten verlässt.The image data obtained during the measurement are collected in a processing unit. Thereafter, the difference of the data to the measured or calculated target data takes place. When a quality criterion formed from the differences is exceeded, the differences are divided into the individual colors involved in the printing at the measuring point, eg according to the principle of the smallest deviation squares. The differences are represented component by component as sums of products from coefficients with values of the individual inks, with area coverage values and empirical weighting factors in the form of a system of equations. The coefficients result after the solution of the system of equations by methods of calculation known per se. The coefficients are then converted into curves by means of characteristic curves Volltondichteänderungen and then converted into slider changes the zone inking unit. In this case, infinitely many different solutions of the equation system are possible in particular when one or more printing inks have high density values in all spectral ranges. It is then selected that division, which leaves the optimum layer thickness of the offset printing least according to an extended quality criterion.
Bei der Aufteilung der Dichtedifferenzen können aktuelle oder vorbekannte Informationen über das Trappingverhalten oder spektrale Nichtlinearitäten mit einfließen. Es ist z.B. bekannt, dass die nachdruckenden Farben mit ihren Haupt- und Nebendichten nicht einfach zur Dichte der ersten druckenden Farbe addiert werden können. Der Grund liegt im nicht idealen Remissionsverhalten der realen Farben. Sehr deutlich wird dies beim Druck von Deckweiß im letzten Farbwerk. Deckweiß überstrahlt alle vordruckenden Farben. Diese Art von Überstrahlungseffekten können durch Kompensationsfaktoren für das Verhalten um den Arbeitspunkt empirisch beschrieben werden.When distributing the density differences, current or previously known information about the trapping behavior or spectral nonlinearities can be included. It is e.g. It is known that the reprinting colors with their main and secondary densities can not simply be added to the density of the first printing color. The reason lies in the non-ideal remission behavior of the real colors. This is very clear when printing opaque white in the last inking unit. Opaque white outshines all pre-printed colors. This type of blooming effects can be empirically described by compensation factors for the behavior around the working point.
Die Beachtung von Randbedingungen (insbesondere Volltondichte bzw. Schichtdicke) erlaubt die Einhaltung der offsettypischen Gegebenheiten. Dazu ist neben der Gewinnung der Soll- und Istvorlagen der aktuelle Volltondichtewert notwendig. Dieser Wert kommt aus einem speziellen Messfeld z.B. in einem Messstreifen oder durch Auswertung (Profilscann) eines einzelnen Rasterpunktes.
Die Beachtung von Randbedingungen erlaubt die Begrenzung der Steuerbewegungen auf Schichtdickenbereiche, in denen der Offsetdruck noch funktioniert. (0,6 - 1,3 µm).
Die Gewinnung der Randbedingungen kann durch Videobildanalyse von einzelnen Rasterpunkten und Auswertung der Vorstufeninformation an dieser Bildstelle erfolgen. Das Verlassen des offsettypischen Bildbereiches zeigt sich absolut deutlich in der 1000-fachen Vergrößerung von Rasterpunkten.The observation of boundary conditions (in particular solid density or layer thickness) allows compliance with the offsetting typical conditions. For this purpose, in addition to obtaining the target and actual templates, the current full-tone density value is necessary. This value comes from a special measuring field eg in a measuring strip or by evaluation (profile scan) of a single grid point.
The consideration of boundary conditions allows the limitation of the control movements to layer thickness ranges, in which the offset printing still works. (0.6-1.3 μm).
The acquisition of the boundary conditions can be done by video image analysis of individual halftone dots and evaluation of the precursor information at this image location. Leaving the offsetting typical image area is absolutely clear in the 1000-fold magnification of halftone dots.
Claims (29)
- Method of controlling coloration at a printing machine, wherein- quantitative image data inclusive of the associated positional data (x; y) are determined from a target comparison copy,- quantitative image data inclusive of the associated positional data (x; y) are determined from an actual copy,- quantitative image data inclusive of the associated positional data (x; y) are determined from respective printing mechanism basic copies,characterised in that- quantitative image data are determined in each instance from N pixels per printing image copy,- N differences are formed from the quantitative image data of the target comparison copy and the actual copy,- resolution factors K1, K2, K3 are determined by computer from the differences with the assistance of the quantitative image data of the printing mechanism basic copies by way of an equation system which in the case of three basic colours participating in the printing assumes the form:- are converted into control data for the printing mechanism setting elements.
- Method of controlling coloration at a printing machine according to claim 1, characterised in that boundary conditions are included in the determination of the resolution factors.
- Method of controlling coloration at a printing machine according to claim 2, characterised in that the boundary condition - full-tone density value or layer thickness - is obtained from a special measuring field on a measuring strip.
- Method of controlling coloration at a printing machine according to claim 3, characterised in that the boundary condition - full-tone density value or layer thickness - is obtained from an individual dot.
- Method of controlling coloration at a printing machine according to claim 4, characterised in that the dot is analysed by means of video image analysis.
- Method of controlling coloration at a printing machine according to claim 1, characterised in that the full-tone density is included in the determination of the resolution factors and the control data are a product of the resolution factors and the full-tone density.
- Method of controlling coloration at a printing machine according to claim 1, characterised in that the determination of the resolution factors is carried out by simulation of the compression.
- Method of controlling coloration at a printing machine according to claim 1, characterised in that the determination of the resolution factors is carried out partly by simulation of the compression.
- Method of controlling coloration at a printing machine according to claim 1, characterised in that the image data are brightness values, density values, spectral values, RYB values or LAB values
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that the comparison copy or printing mechanism basic copy is a print pattern, a print pattern copy, a proof information or a digital copy.
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that the positional data are obtained from selectable positions (x; y).
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that the positional information is obtained in the manner of an array.
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that the determination of the image data and positional information is carried out by measurements.
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that the determination of the image data is carried by selection of values.
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that the printing mechanism basic copy is quasi a colour extract.
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that the resolution by computer takes place according to the method of smallest squares.
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that the image data inclusive of the associated positional data are obtained from an array representing the entire printing or arrays representing sub-regions of the printing.
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that the arrays representing sub-regions are colour zones.
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that for determination of the image data use is made of intensity sensors for regions of any spectral width and characteristic (UV, visible or infrared), special density sensors (CMYK), special colour sensors (LAB), spectrally resolving sensors and video cameras (RYB and/or B/W).
- Method of controlling coloration at a printing a printing machine according to claim 12, characterised in that the local spacings of the positional data in the array lie in the range of microns and the total printing width.
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that the determination of the control data is carried out by resolving equations.
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that the determination of the control data is carried out by computerised simulation.
- Method of controlling coloration at a printing a printing machine according to claim 12, characterised in that the image data are obtained from a measuring spot in the array, the size of which lies in the range of microns and the total printing width.
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that sub-regions with specific weightings are taken into consideration for the resolution in that the resolution factors contain K weighting factors.
- Method of controlling coloration at a printing a printing machine according to claim 24, characterised in that the weighting is the image weighting.
- Method of controlling coloration at a printing a printing machine according to claim 19, characterised in that the sensors are arranged off-line or in-line in the printing machine.
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that the control data are evaluated automatically or manually by an operator.
- Method of controlling coloration at a printing a printing machine according to claim 1, characterised in that the resolution factors are recalculated into full-tone changes.
- Method of controlling coloration at a printing a printing machine according to claim 28, characterised in that full-tone changes are converted into control data.
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19908296 | 1999-02-26 | ||
DE19908292 | 1999-02-26 | ||
DE1999108294 DE19908294A1 (en) | 1999-02-26 | 1999-02-26 | Control of color deposition in a printing machine has color measured and compared with reference to control components |
DE19908293 | 1999-02-26 | ||
DE19908295 | 1999-02-26 | ||
DE1999108292 DE19908292A1 (en) | 1999-02-26 | 1999-02-26 | Control of color deposition in a printing machine has color measured and compared with reference to control components |
DE19908294 | 1999-02-26 | ||
DE1999108293 DE19908293A1 (en) | 1999-02-26 | 1999-02-26 | Control of color deposition in a printing machine has color measured and compared with reference to control components |
DE19908296A DE19908296A1 (en) | 1999-02-26 | 1999-02-26 | Control of color deposition in a printing machine has color measured and compared with reference to control components |
DE1999108295 DE19908295A1 (en) | 1999-02-26 | 1999-02-26 | Control of color deposition in a printing machine has color measured and compared with reference to control components |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1033247A1 EP1033247A1 (en) | 2000-09-06 |
EP1033247B1 true EP1033247B1 (en) | 2011-01-05 |
Family
ID=27512680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00103191A Expired - Lifetime EP1033247B1 (en) | 1999-02-26 | 2000-02-17 | Method for controlling colour in a printing machine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1033247B1 (en) |
AT (1) | ATE494144T1 (en) |
DE (1) | DE50016054D1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004021599A1 (en) | 2004-05-03 | 2005-12-01 | Gretag-Macbeth Ag | Method for determining color and / or density values and printing devices designed for the method |
DE102006009383A1 (en) * | 2006-03-01 | 2007-09-06 | Koenig & Bauer Aktiengesellschaft | Inking system inline-controlling method for e.g. offset printing machine, involves detecting print image data of measuring point in on-line by inline-measuring device during printing, where inline-regulation is effected based on detection |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD227094B5 (en) | 1984-10-04 | 1996-02-22 | Roland Man Druckmasch | Method for colorimetric evaluation of printed products |
US5224421A (en) | 1992-04-28 | 1993-07-06 | Heidelberg Harris, Inc. | Method for color adjustment and control in a printing press |
US5412577A (en) * | 1992-10-28 | 1995-05-02 | Quad/Tech International | Color registration system for a printing press |
DE4343905C2 (en) | 1993-12-22 | 1996-02-15 | Roland Man Druckmasch | Process for controlling the ink flow in a printing press |
-
2000
- 2000-02-17 EP EP00103191A patent/EP1033247B1/en not_active Expired - Lifetime
- 2000-02-17 AT AT00103191T patent/ATE494144T1/en active
- 2000-02-17 DE DE50016054T patent/DE50016054D1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ATE494144T1 (en) | 2011-01-15 |
EP1033247A1 (en) | 2000-09-06 |
DE50016054D1 (en) | 2011-02-17 |
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