EP0282446A1 - Method for continuously controlling inking in an intaglio or flexographic process, and corresponding printing machine - Google Patents
Method for continuously controlling inking in an intaglio or flexographic process, and corresponding printing machine Download PDFInfo
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- EP0282446A1 EP0282446A1 EP88810096A EP88810096A EP0282446A1 EP 0282446 A1 EP0282446 A1 EP 0282446A1 EP 88810096 A EP88810096 A EP 88810096A EP 88810096 A EP88810096 A EP 88810096A EP 0282446 A1 EP0282446 A1 EP 0282446A1
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- color
- printing
- gray
- deviation
- concentrate
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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 continuous printing control of the coloring in gravure or flexographic printing according to the preamble of patent claim 1 and a corresponding printing machine according to the preamble of patent claim 8.
- the color concentration (relative composition of the printing inks from color concentrate, waste and solvent) is one of the most important parameters that must be checked. This has a decisive influence on the coloring of the process as well as the color and tonal quality of the printed product. The quality is still assessed practically exclusively by the eye and with the help of hand densitometers.
- the color control is carried out on the basis of a single control field which contains all the (colored) printing inks involved (i.e. gray), this being measured and evaluated not by densitometry as previously, but by colorimetry. So you regulate the colorimetric consistency of the gray field and essentially don't care how the individual printing inks behave. This is a completely new "control philosophy" that totally deviates from the previously used procedures. In the known methods, each color has always been controlled individually and, in addition, different tones (high tones, midtones) have been evaluated for measurement in each color.
- the finished printed sheet 1 which has a printed image 5 and a printed control measurement field 4, which is also explained in more detail below, runs past a photoelectric measurement head 6 and is guided by a deflection roller 6a.
- the measuring head 6 is connected to an electronic, computer-controlled processing device 100, which cooperates with a monitor 20, an input keyboard 21, a log printer 22 and a synchronization device 25 and controls a dosing control 12.
- the synchronization device 25, which can be, for example, a clock and angle encoder or a sensor for any synchronization marks that are also printed, synchronizes the printing cylinder 2 with the processing device 100 and ensures that the measuring head 6 is activated exactly at the moment in which the control field 4 passes under it.
- the printing press shown corresponds essentially to the prior art, so that a more detailed explanation is unnecessary.
- the differences relevant to the invention relate to the special type of control field 4 used, its measurement and the evaluation and processing of the measured values for the correction variables for the dosing control 12 already mentioned. These differences are explained in more detail below.
- the control measuring field 4 comprises a print of the three participating printing inks cyan, magenta and yellow, the ratio of which is selected so that an approximate gray with a density of approximately 0.5 results.
- the size of the control field is typically around 4-10 mm square. It essentially depends on the necessary light output and the speed of the printing sheet.
- the measuring head 6 is designed as a spectral measuring head, which detects the remissions of the gray field 4 over the entire range of the visible spectrum at, for example, 35 discrete wavelengths (for example every 10 nm). Spectral reflectance measuring heads of this type are known and therefore require no further explanation.
- the processing device 100 records the most important stages or functional units (all of which are, of course, advantageously implemented in software) a standard color value calculator 10 for predetermined color coordinate calculators 8, a target value memory 7, a color coordination target values, a difference former 9, a parameter memory 24 and a correction calculator 11. Constant values and parameters, as is generally the case, are either stored during programming or entered via keyboard 21.
- Color coordinate setpoints F 0 * can either be entered via the keyboard or, as is generally the case, can be read in and saved by measuring a reference control measuring field.
- the standard color value calculator 7 calculates from, for example, 35 individual spectral reflectance values R (possibly averaged over a number of printed sheets) the standard color values N (X, Y, Z) according to the formulas of CIE 1931 (Commission Internationale de L'Eclairage).
- the color coordinate computer 8 then calculates the three color coordinates from these values F * (L *, a *, b *) of the L *, a *, b * color space of the CIE (or a corresponding other equally spaced color space).
- the index i stands for the individual inks (cyan, yellow, magenta).
- the vectorial representation is chosen because the color concentrate, the blend and the solvent are influenced.
- the actual dosing is carried out by the dosing control 12, which is in addition to the correction vectors ⁇ M i of course also preset (recipe) basic values (vectors M oi ) is taken into account and ensures that the dosing corrections carried out are not only carried out once, but the target vectors are updated accordingly. (The new target vectors result from the sum of the last valid target vectors and the correction vectors.)
- the practical implementation of the metering control 12 (for example analogous to CH-PS 622 632) is clear to the person skilled in the art and therefore requires no further explanation.
- FIG. 2 they are individual arithmetic steps, which differ from the difference vector representing the color locus deviation of the control measuring field 4 ⁇ F * to the three correction vectors ⁇ M i lead, shown in the form of a flow chart.
- the difference vector ⁇ F * has the three components ⁇ L *, ⁇ a * and Ab * .
- AL * expresses the deviation in brightness, ⁇ a * and ⁇ b * the chromatic deviation.
- the amount ⁇ C * of the chromatic deviation is first calculated (27). This is followed by a comparison of the magnitude of the brightness deviation AL * and the amount ⁇ C * of the chromatic deviation and a branching depending on how the comparison is based. If the deviation in brightness is not less than the chromatic deviation, the calculation path designated 28 is taken, otherwise path 29.
- a further decision is first made in path 28: if the brightness deviation is not negative (the control measuring field is too bright), the further calculation is carried out according to path 30, otherwise according to path 31.
- the pressure is too dark (path 31)
- the purpose of this correction is to avoid jumps in viscosity when adding color or blends, which are usually more viscous.
- the solvent correction vector ⁇ T and the concentrate correction vector ⁇ F or the waste correction vector ⁇ V determine the currently required correction of the compositions of the printing inks, ie the current quantities of concentrate, waste and solvent (for example toluene) to be supplied in order to achieve the required composition correction. Now, however, this new composition must also be retained (until a possible new correction is made), which means that the dosing recipe (relative proportions of the color components) must also be adjusted accordingly.
- the constant vectors ff and vf are each three-component, whereby one component is assigned to one of the three participating (colored) printing inks.
- the vector ff indicates the color effect in the existing color composition, ie how many volume units (eg liters) of color concentrate must be added to the existing concentrate-blend-solvent mixture in order to change AL * by one unit.
- the vector gives accordingly vf the blending effect, i.e. the amount of blending to be added for the change in unit AL * (e.g. liters).
- the components of these vectors are empirical values and must be determined empirically (when the machine is run in).
- the diagonal matrices (tf) and (tv) each have 3 rows and 3 columns. Their diagonal elements indicate the amount of solvent (toluene) to be added per unit amount of color concentrate or blend in order to keep the overall viscosity (to some extent) constant. Practical values for the diagonal elements of the two matrices are, for example, (0.4 / 0.3 / 0.5) for (tf) and 0.9 / 0.4 / 0.6) for (tv) in the order cyan, magenta and yellow.
- the diagonal matrices (pf) and (pv) indicate the percentage by which the concentration of the color concentrate (amount of color concentrate based on the sum of the amounts of color concentrate and blend) changes when a unit amount (e.g. 1 liter) of color concentrate or blend in the total amount in circulation is added.
- a unit amount e.g. 1 liter
- Practical values for the diagonal elements of (pf) and (pv) are, for example (0.4 / 0.5 / 0.3) and (0.6 / 0.5 / 0.7).
- av (-100 °), ac ( ⁇ 2150) and a M ( ⁇ 330 °) are the directions (angles) (stored in parameter memory 24) of the primary color axes for yellow, cyan and magenta, then for (r) in the angular range ⁇ Y ⁇ ⁇ ⁇ ⁇ c the matrix in the diaper area a c ⁇ ⁇ ⁇ ⁇ M the matrix and in the angular range ⁇ M ⁇ ⁇ ⁇ ay the matrix be valid.
- the correction matrices (r) assume that every color deviation is caused by changing only two (of the three participating) colors can be corrected and indicate the percentage changes (ie based on the unit of the AC * amount) for the two colors concerned. Which two colors are used depends on the direction a of the color deviation according to the above selection scheme. (These are the two colors with the direction a falling between their primary color axes.)
- the amount ⁇ C * is now multiplied by the correction matrix (r) (based on a) and then calculated in exactly the same way as in the case of ⁇ L * ⁇ ⁇ C ⁇ , but instead of AL * , the product ⁇ C * • (r ) stands.
- paths 45 and 46 are split depending on whether ⁇ C * ⁇ 0 or AC * ⁇ .
- the end result is then neither a concentrate correction vector ⁇ F or a waste correction vector ⁇ V a solvent correction vector ⁇ T and a recipe correction vector ⁇ f , whereby all these correction vectors now only influence two colors, the third component is therefore zero or (in practice) does not exist.
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Fortdruckregelung der Farbgebung beim Tief- oder Flexodruck gemäss Oberbegriff des Patentanspruchs 1 sowie ein entsprechende Druckmaschine gemäss Oberbegriff des Patentanspruchs 8.The invention relates to a method for continuous printing control of the coloring in gravure or flexographic printing according to the preamble of
Beim Tiefdruck und auch beim Flexo-Druck ist die Farbkonzentration (relative Zusammensetzung der Druckfarben aus Farbkonzentrat, Verschnitt und Lösungsmittel) einer der wichtigsten Parameter, die kontrolliert werden müssen. Die beeinflusst in entscheidender Weise die Farbgebung des Prozesses sowie die farb- und tonmässige Qualität des Druckerzeugnisses. Die Qualität wird heute noch praktisch ausschliesslich von Auge und unter Zuhilfenahme von Handdensitometern beurteilt.In gravure printing and also in flexo printing, the color concentration (relative composition of the printing inks from color concentrate, waste and solvent) is one of the most important parameters that must be checked. This has a decisive influence on the coloring of the process as well as the color and tonal quality of the printed product. The quality is still assessed practically exclusively by the eye and with the help of hand densitometers.
Es hat seit Jahrzehnten an Versuchen nicht gefehlt, die direkte Regelung der Tiefdruckmaschine vorzunehmen. Sie konnten sich aber in der Praxis nicht durchsetzen, obwohl an sich die Problematik wesentlich einfacher (nur longitudinale Farbschwankungen) als bei der heute bereits installierten Farbregelung für den Offsetdruck (zusätzlich transversale Farbschwankungen) ist.For decades there has been no lack of attempts to control the rotogravure machine directly. However, they could not prevail in practice, even though the problem itself is much simpler (only longitudinal color fluctuations) than with the color control for offset printing already installed today (additional transverse color fluctuations).
Die bekannten Lösungen (z.B. DE-B-24 10 753) haben den Nachteil, dass sie auf der Kontrolle der Einfarbenstärke (in Remission oder Dichte) von Einzelfarbmustern basieren, welche beim bereits hohen Qualitätsstandard des Tiefdruckes kein befreidigendes Preis-Leistungsverhältnis zulassen und zudem bei speziell kritischen Farbtönen genauigkeitsmässig komplett versagen.The known solutions (e.g. DE-B-24 10 753) have the disadvantage that they are based on the control of the single-color strength (in remission or density) of individual color patterns, which do not allow for a favorable price-performance ratio and also for the already high quality standard of gravure printing especially critical colors fail completely in terms of accuracy.
Es ist Aufgabe der vorliegenden Erfindung, ein drucktechnisch speziell einfaches Verfahren und eine entsprechende Druckmaschine anzugeben, welche eine schnelle und hochgenaue Regelung der Farbgebung beim Tief- oder Flexo-Druck gestatten.It is an object of the present invention to provide a process which is particularly simple in terms of printing technology and a corresponding printing press which permit fast and highly precise regulation of the coloring in gravure or flexographic printing.
Das erfindungsgemässe Verfahren und die entsprechende Druckmaschine sind in den unabhängigen Ansprüchen beschrieben. Bevorzugte Ausgestaltungen ergeben sich aus den abhängigen Ansprüchen. Gemäss dem Hauptgedanken der Erfindung erfolgt also die Farbregelung anhand eines einzigen, alle beteiligten (Bunt-) Druckfarben enthaltenden (d.h. grauen) Kontrollfelds, wobei dieses nicht wie bisher üblich densitometrisch, sondern farbmaetrisch gemessen und ausgewertet wird. Man regelt also auf farbmetrische Konstanz des Graufelds und kümmert sich dabei im wesentlichen nicht darum, wie sich die einzelnen Druckfarben für sich verhalten. Dies ist eine völlig neue "Regelphilosophie", die von den bisher gängigen Verfahren total abweicht. Bei den bekannten Verfahren hat man immer jede Farbe einzeln gesteuert und ausserdem in jeder Farbe verschiedene Töne (Hochtöne, Mitteltöne) zur Messung ausgewertet. Mischtöne hat man nur zweitrangig herangezogen, um beim Versagen der Einzelfarbsteuerung doch noch eine gewisse Korrekturinformation zu gewinnen. Das erfindungsgemässe Verfahren beschränkt sich hingegen auf einen einzigen Punkt der Druckkennlinien und betrachtet den Gang der Einzelfarben (insbesondere der Einzelvolltöne) als zweitrangig. Dass dieses Verfahren praktisch funktionieren würde, war nach der herrschenden Lehrmeinung nicht zu erwarten.The method according to the invention and the corresponding printing press are described in the independent claims. Preferred configurations result from the dependent claims. According to the main idea of the invention, the color control is carried out on the basis of a single control field which contains all the (colored) printing inks involved (i.e. gray), this being measured and evaluated not by densitometry as previously, but by colorimetry. So you regulate the colorimetric consistency of the gray field and essentially don't care how the individual printing inks behave. This is a completely new "control philosophy" that totally deviates from the previously used procedures. In the known methods, each color has always been controlled individually and, in addition, different tones (high tones, midtones) have been evaluated for measurement in each color. Mixed tones have only been used secondarily in order to obtain a certain amount of correction information if the single color control fails. The method according to the invention, on the other hand, is limited to a single point of the printing characteristic curves and considers the course of the individual colors (in particular the individual full tones) to be of secondary importance. According to the prevailing doctrine, it was not to be expected that this method would work in practice.
Aus EP-A-89016 ist es zwar bekannt, eine Flexo-Druckmaschine anhand eines einzigen Graukontrollfelds einzustellen. Dort wird das Graufeld aber erstens nicht farbmetrisch, sondern densitometrisch ausgewertet, und zweitens wird dort nicht die Farbgebung, sondern der Anpressdruck des Klischeezylinders geregelt. Dies ist ein gänzlich anderes Problem.From EP-A-89016 it is known to set a flexographic printing machine using a single gray control field. There, the gray field is first evaluated not colorimetrically, but densitometrically, and secondly, it is not the coloring, but the contact pressure of the plate cylinder that is regulated. This is an entirely different problem.
Im folgenden wird die Erfindung anhand der Zeichnung näher erläutert. Es zeigen:
- Fig. 1 eine schematische Gesamtdarstellung der erfindungsrelevanten Teile einer erfindungsgemässen Druckmaschine und
- Fig. 2 ein Flußschema zur Erläuterung des erfindungsgemässen Verfahrens.
- Fig. 1 is a schematic overall representation of the parts of a printing press according to the invention and
- 2 shows a flow diagram to explain the method according to the invention.
Von der eigentlichen Tiefdruckmaschine sind in Fig. 1 stellvertretend nur ein Farbkasten 3 und ein Druckzylinder 2 dargestellt. Es versteht sich, dass diese sowie weitere, nicht dargestellte Teile entsprechend der Zahl der verschiedenen Druckfarben (z.B. drei) mehrfach vorhanden sind. Der fertig bedruckte Bogen 1, der ein gedrucktes Bild 5 sowie ein mitgedrucktes, noch näher zur erläuterndes Kontrollmessfeld 4 aufweist, läuft an einem fotoelektrischen Messkopf 6 vorbei und wird dabei von einer Umlenkwalze 6a geführt. Der Messkopf 6 ist an eine eletronische, rechnergesteuerte Verarbeitungseinrichtung 100 angeschlossen, die mit einem Monitor 20, einer Eingabetastatur 21, einem Protokolldrucker 22 und einer Synchronisiereinrichtung 25 zusammenarbeitet und eine Dosiersteuerung 12 ansteuert. Diese wirkt auf Ventile 17-19 in Zufuhrleitungen 14-16 für Farbkonzentrate F;, Verschnitte Vi und Lösungsmittel Ti (i steht stellvertretend für alle beteiligten Druckfarben) und steuert die Zusammensetzungen der Druckfarben in den einzelnen Farbkästen 3 nach Massgabe eines (parametrisch einstellbaren) Sollwertgebers 13 und von der Verarbeitungseinrichtung 100 errechneter Korrekturgrössen. Die Synchronisiereinrichtung 25, bei der es sich z.B. um einen Takt- und Winkelcodierer oder um einen Sensor für allenfalls mitgedruckte Synchronisationsmarken handeln kann, synchronisiert die Druckzylinder 2 mit der Verarbeitungseinrichtung 100 und stellt sicher, dass der Messkopf 6 exakt in dem Moment aktiviert wird, in dem das Kontrollfeld 4 unter ihm durchläuft.Only one
So weit entspricht die dargestellte Druckmaschine im wesentlichen dem Stand der Technik, so dass sich eine nähere Erläuterung erübrigt. Die erfindungsrelevanten Unterschiede betreffen die spezielle Art des verwendeten Kontrollfelds 4, seine Messung und die Auswertung und Verarbeitung der Meswerte zu den schon genannten Korrekturgrössen für die Dosiersteuerung 12. Diese Unterschiede werden im folgenden näher erläutert.So far, the printing press shown corresponds essentially to the prior art, so that a more detailed explanation is unnecessary. The differences relevant to the invention relate to the special type of
Das Kontrollmessfeld 4 umfasst einen Uebereinanderdruck der drei beteiligten Druckfarben Cyan, Magenta und Yellow, wobei deren Verhältnis so gewählt ist, dass sich ein angenähertes Grau mit einer Dichte von etwa 0,5 ergibt. Die Grösse des Kontrollfelds beträgt typisch etwa 4-10 mm im Quadrat. Sie hängt im wesentlichen von der notwendigen Lichtausbeute und der Geschwindigkeit des Druckbogens ab.The
Neben den schon erwähnten Vorteilen der Steuerung mittels eines einzigen Graufelds ergibt sich dadurch auch insofern noch ein Vorteil, als für das einzige Messfeld nur wenig Platz erforderlich ist und dieses daher überall ohne Mühe auf dem Druckbogen untergebracht werden kann. Dies steht im krassen Gegensatz zu den bisherigen Verfahren, die alle eine Vielzahl von Messfeldern benötigen. Zudem fällt nur eine relativ geringe Menge von Daten zur Verarbeitung an.In addition to the advantages of controlling using a single gray field already mentioned, there is also an advantage in that only a small space is required for the single measuring field and it can therefore be accommodated anywhere on the printed sheet without difficulty. This is in stark contrast to the previous methods, which all require a large number of measuring fields. In addition, only a relatively small amount of data is processed.
Der Messkopf 6 ist als Spektralmesskopf ausgebildet, welcher die Remissionen des Graufelds 4 über den gesamten Bereich des sichtbaren Spektrums bei z.B. 35 diskreten Wellenlängen erfasst (z.B. alle 10 nm). Spektrale Remissionsmessköpfe dieser Art sind bekannt und bedürfen daher keiner weiteren Erläuterung. Die Verarbeitungseinrichtung 100 erfasst als wesentlichste Stufen oder Funktionseinheiten (die selbstverständlich allesamt mit Vorteil softwaremässig realisiert sind) einen Normfarbwertrechner 10 für vorgegebene Farbkoordinatenrechner 8, einen Sollwertspeicher 7, einen Farbkoordination-Sollwerte, einen Differenzbildner 9, einen Parameterspeicher 24 und einen Korrekturrechner 11. Konstante Werte und Parameter werden wie allgemein üblich entweder bei der Programmierung abgespeichert oder via Tastatur 21 eingegeben. Farbkoordi naten-Sollwerte
In Fig. 2 sind sie einzelnen Rechenschritte, welche vom die Farbortabweichuna des Kontrollmessfelds 4 repräsentierenden Differenzvektor
Der Differenzvektor
In einem ersten Schritt wird zunächst der Betrag ΔC* der chromatischen Abweichung gemäss
Im Pfad 28 wird zunächst ein weitere Entscheidung getroffen: Wenn die Helligkeitsabweichung nicht negativ (das Kontrollmessfeld also zu hell) ist, erfolgt die weitere Berechnung gemäss Pfad 30, andernfalls gemäss Pfad 31.A further decision is first made in path 28: if the brightness deviation is not negative (the control measuring field is too bright), the further calculation is carried out according to
Bei zu hellem Druck (Pfad 30) erfolgt die Regelung primär über die Farbkonzentrate, indem die Helligkeitsabweichung AL* mit einem noch zu erläuternden konstanten Vektor ff multipliziert wird und den Konzentratkorrekturvektor
Der Lösungsmittelkorrekturvektor
Die konstanten Vektoren
Die Diagonal-Matrizen (tf) und (tv) weisen je 3 Reihen und 3 Spalten auf. Ihre Diagonal-Elemente geben die pro Einheitsmenge Farbkonzentrat bzw. Verschnitt zuzuführende Menge Lösungsmittel (Toluol) an, um die Gesamtviskosität (einigermassen) konstant zu halten. Praktische Werte für die Diagonalelemente der beiden Matrizen sind beispielsweise (0,4/0,3/0,5) für (tf) und 0,9/0,4/0,6) für (tv) in der Reihenfolge Cyan, Magenta und Yellow.The diagonal matrices (tf) and (tv) each have 3 rows and 3 columns. Their diagonal elements indicate the amount of solvent (toluene) to be added per unit amount of color concentrate or blend in order to keep the overall viscosity (to some extent) constant. Practical values for the diagonal elements of the two matrices are, for example, (0.4 / 0.3 / 0.5) for (tf) and 0.9 / 0.4 / 0.6) for (tv) in the order cyan, magenta and yellow.
Die Diagonal-Matrizen (pf) und (pv) geben an, um wieviel Prozent sich die Konzentration des Farbkonzentrats (Menge Farbkonzentrat bezogen auf Summe der Mengen von Farbkonzentrat und Verschnitt) ändert, wenn eine Einheitsmenge (z.B. 1 Liter) Farbkonzentrat bzw. Verschnitt in die Gesamtumlaufmenge zugegeben wird. Hier geht natürlich in erster Linie die Tankgrösse bzw. die Gesamtumlaufmenge der Farbmischungen ein. Ausserdem genügen (pf) und (pv) offensichtlich der Beziehung (pv) = 1-(pf). Praktische Werte für die Diagonal-Elemente von (pf) und (pv) sind beispielsweise (0,4/0,5/0,3) bzw. (0,6/0,5/0,7).The diagonal matrices (pf) and (pv) indicate the percentage by which the concentration of the color concentrate (amount of color concentrate based on the sum of the amounts of color concentrate and blend) changes when a unit amount (e.g. 1 liter) of color concentrate or blend in the total amount in circulation is added. Here, of course, primarily the tank size or the total quantity of paint in circulation is included. In addition, (pf) and (pv) obviously satisfy the relationship (pv) = 1- (pf). Practical values for the diagonal elements of (pf) and (pv) are, for example (0.4 / 0.5 / 0.3) and (0.6 / 0.5 / 0.7).
Falls es sich bei der gemessenen Farbortabweichung im wesentlichen um eine chromatische Abweichung handelt (Pfad 29), wird zunächst die Richtung a der Farbabweichung gemäss a = arctan (Ab*/Aa*) bestimmt. Dann wird anhand des Winkels a = a + 180° (die zu a entgegengesetzte Richtung) eine von drei Korrekturmatrizen (r) ausgewählt, die für die weitere Berechnung benötigt wird. Wenn av (-100°), ac (~ 2150) und aM (~ 330°) die (im Parameterspeicher 24 abgelegten) Richtungen (Winkel) der Grundfarbenachsen für Yellow, Cyan und Magenta sind, dann soll für (r) im Winkelbereich αY ≦ α ≦ αc die Matrix
Die Korrekturmatrizen (r) gehen davon aus, dass jede Farbabweichung durch Veränderung von nur zwei (der drei beteiligten) Farben korrigiert werden kann, und geben die prozentualen (d.h. auf die Einheit des Betrags AC* bezogenen) Aenderungen für die betreffenden beiden Farben an. Welche beiden Farben jeweils zum Zuge kommen, bestimmt sich aus der Richtung a der Farbabweichung gemäss obigem Auswahlschema. (Es sind dies diejenigen beiden Farben, zwischen deren Grundfarbenachsen die Richtung a fällt.)The correction matrices (r) assume that every color deviation is caused by changing only two (of the three participating) colors can be corrected and indicate the percentage changes (ie based on the unit of the AC * amount) for the two colors concerned. Which two colors are used depends on the direction a of the color deviation according to the above selection scheme. (These are the two colors with the direction a falling between their primary color axes.)
Es wird nun der Betrag ΔC* mit der (aufgrund von a ausgewählten) Korrekturmatrix (r) multipliziert und dann in genau der gleichen Weise weitergerechnet wie im Falle ΔL* ≧ ΔC`, wobei jedoch anstelle AL* jeweils das Produkt ΔC*•(r) steht. Auch hierbei erfolgt eine Aufspaltung in Pfade 45 und 46 je nach dem, ob ΔC* ≧ 0 oder AC* < ϕ war. Als Endergebnis erhält man dann weder einen Konzentratkorrekturvektor
Der Vorteil des beschriebenen Verfahrens liegt in der vollständigen Entflechtung, die bei Farbkorrekturfragen immer schwerer zu erreichen ist. Ausserdem ist das Verfahren logisch, übersichtlich und praxisgerecht.The advantage of the described method lies in the complete unbundling, which is more and more difficult to achieve with color correction questions. In addition, the process is logical, clear and practical.
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CH679/87 | 1987-02-23 | ||
CH67987 | 1987-02-23 |
Publications (2)
Publication Number | Publication Date |
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EP0282446A1 true EP0282446A1 (en) | 1988-09-14 |
EP0282446B1 EP0282446B1 (en) | 1991-04-17 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19880810096 Expired - Lifetime EP0282446B1 (en) | 1987-02-23 | 1988-02-17 | Method for continuously controlling inking in an intaglio or flexographic process, and corresponding printing machine |
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Country | Link |
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EP (1) | EP0282446B1 (en) |
JP (1) | JPS63242545A (en) |
DE (1) | DE3862409D1 (en) |
DK (1) | DK166443B1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5646656A (en) * | 1994-02-12 | 1997-07-08 | Heidelberger Druckmaschinen Ag | Ink-jet printing device and method |
WO2009071330A2 (en) * | 2007-12-06 | 2009-06-11 | Windmöller & Hölscher Kg | A method and a system for the extrapolation of densitometric measured values in not mesured wavelength ranges at a printing press |
EP2295248A1 (en) * | 2009-09-10 | 2011-03-16 | Windmöller & Hölscher KG | Method and device for finding the specific ink transfer behaviour of a ink transfer roller |
Citations (6)
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DE2410753A1 (en) * | 1974-03-06 | 1975-09-18 | Burda Farben Kg | Ink blending unit for printing machine - has circuit for supplying printing roller system with an ink mixture comprising several components |
US4256131A (en) * | 1976-07-14 | 1981-03-17 | Sentrol Systems Ltd. | Feedback color control system |
EP0089016A1 (en) * | 1982-03-16 | 1983-09-21 | Windmöller & Hölscher | Method of automatically adjusting the colours printed by flexographic printing machines in a four-colour printing process |
CH649842A5 (en) * | 1980-02-27 | 1985-06-14 | Roland Man Druckmasch | Method for determining individual colour components in a multicolour print by means of a densitometer |
FR2594131A1 (en) * | 1986-02-12 | 1987-08-14 | Sublistatic Int | Automatic process for the preparation of printing inks |
EP0255586A2 (en) * | 1986-08-05 | 1988-02-10 | FOGRA Deutsche Forschungsgesellschaft für Druck- und Reproduktionstechnik e.V. | Method and device for influencing the inking of an inked surface in a printing process |
-
1988
- 1988-02-17 EP EP19880810096 patent/EP0282446B1/en not_active Expired - Lifetime
- 1988-02-17 DE DE8888810096T patent/DE3862409D1/en not_active Expired - Fee Related
- 1988-02-22 DK DK89988A patent/DK166443B1/en not_active IP Right Cessation
- 1988-02-23 JP JP63040550A patent/JPS63242545A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2410753A1 (en) * | 1974-03-06 | 1975-09-18 | Burda Farben Kg | Ink blending unit for printing machine - has circuit for supplying printing roller system with an ink mixture comprising several components |
US4256131A (en) * | 1976-07-14 | 1981-03-17 | Sentrol Systems Ltd. | Feedback color control system |
CH649842A5 (en) * | 1980-02-27 | 1985-06-14 | Roland Man Druckmasch | Method for determining individual colour components in a multicolour print by means of a densitometer |
EP0089016A1 (en) * | 1982-03-16 | 1983-09-21 | Windmöller & Hölscher | Method of automatically adjusting the colours printed by flexographic printing machines in a four-colour printing process |
FR2594131A1 (en) * | 1986-02-12 | 1987-08-14 | Sublistatic Int | Automatic process for the preparation of printing inks |
EP0255586A2 (en) * | 1986-08-05 | 1988-02-10 | FOGRA Deutsche Forschungsgesellschaft für Druck- und Reproduktionstechnik e.V. | Method and device for influencing the inking of an inked surface in a printing process |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5646656A (en) * | 1994-02-12 | 1997-07-08 | Heidelberger Druckmaschinen Ag | Ink-jet printing device and method |
WO2009071330A2 (en) * | 2007-12-06 | 2009-06-11 | Windmöller & Hölscher Kg | A method and a system for the extrapolation of densitometric measured values in not mesured wavelength ranges at a printing press |
WO2009071133A1 (en) * | 2007-12-06 | 2009-06-11 | Windmöller & Hölscher Kg | Colour-management |
WO2009071330A3 (en) * | 2007-12-06 | 2009-11-12 | Windmöller & Hölscher Kg | A method and a system for the extrapolation of densitometric measured values in not mesured wavelength ranges at a printing press |
CN101939167B (en) * | 2007-12-06 | 2013-07-03 | 温德莫勒及霍尔希尔公司 | Colour-management |
EP2295248A1 (en) * | 2009-09-10 | 2011-03-16 | Windmöller & Hölscher KG | Method and device for finding the specific ink transfer behaviour of a ink transfer roller |
Also Published As
Publication number | Publication date |
---|---|
DE3862409D1 (en) | 1991-05-23 |
JPS63242545A (en) | 1988-10-07 |
DK166443B1 (en) | 1993-05-24 |
DK89988D0 (en) | 1988-02-22 |
EP0282446B1 (en) | 1991-04-17 |
DK89988A (en) | 1988-08-24 |
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