EP1720705B1 - Procede de reglage de la couleur dans des presses d'impression - Google Patents

Procede de reglage de la couleur dans des presses d'impression 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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EP
European Patent Office
Prior art keywords
ink
color
location
determined
measured
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP05715317A
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German (de)
English (en)
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EP1720705A1 (fr
Inventor
Peter Schramm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manroland AG
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Manroland AG
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Publication date
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply

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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Color Image Communication Systems (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Image Processing (AREA)
  • Color, Gradation (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)

Claims (7)

  1. Procédé de réglage de la couleur sur des machines d'impression, comprenant les étapes suivantes :
    a) pour régler la couleur, dans une première étape ou un premier stade du procédé, on ne modifie que l'apport d'encre d'une seule encre de traitement, sachant qu'il est alors déterminé comment la modification de l'apport d'encre de cette unique encre de traitement agit sur les valeurs colorées d'une tache colorée à mesurer, un jeu de valeur de mesures étant enregistré au titre de vecteur de coloration (22) entre un endroit de coloration (20) avant la modification de l'apport d'encre et un endroit de coloration (21) après la modification de l'apport d'encre pour la couleur de la tache colorée et ceci étant réalisé séparément et successivement pour chaque encre de traitement individuelle impliquées dans l'impression commune autocaractéristique;
    b) pour le réglage de la couleur, dans une deuxième étape ou un deuxième stade, toutes les valeurs de mesure déterminées et enregistrées en corrélation avec l'étape a) de toutes les encres de traitement impliquées sont calculées mutuellement de manière à ce que, pour continuer le réglage de couleur, certaines ou la totalité des encres de traitement impliquées dans l'impression soient ajustées en même temps.
  2. Procédé selon la revendication 1,
    caractérisé en ce que,
    pendant l'impression, au moins une tache colorée est mesurée, au moins un endroit de coloration réel étant déterminé lors de cette mesure, et que le ou chaque endroit de coloration réel est comparé à un endroit de coloration théorique correspondant, le réglage de couleur étant réalisé en cas de différence entre l'endroit de coloration réel et l'endroit de coloration théorique correspondant.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que,
    pour déterminer les valeurs de mesure du ou de chaque endroit de coloration dans l'étape a), on attend qu'un état d'équilibre soit atteint avec la modification de l'apport d'encre de la couleur respective à imprimer.
  4. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que,
    pour déterminer les valeurs de mesure du ou de chaque endroit de coloration dans l'étape a) après un certain laps de temps ou à certains intervalles temporels définis, on mesure au moins une valeur et on en déduit par extrapolation que l'état d'équilibre s'établit.
  5. Procédé selon une ou plusieurs des revendications 1 à 4,
    caractérisé en ce que,
    dans l'étape a), on mesure séparément et successivement dans le temps comment la modification isolée de l'apport d'encre de l'apport d'encre de chacune des encres de traitement agit sur l'endroit de coloration de la tache colorée à mesurer, en particulier sur un vecteur de coloration.
  6. Procédé selon la revendication 5,
    caractérisé en ce que
    il est alors déterminé comment, en cas de modification de l'apport d'encre de chacune des encres de traitement, l'endroit de coloration se décale et que, à partir de l'endroit de coloration existant avant le réglage de couleur et de celui existant après le réglage de couleur, on détermine la dimension et le sens d'un vecteur de coloration.
  7. Procédé selon une ou plusieurs des revendications 1 à 6,
    caractérisé en ce que
    le calcul des valeurs de mesure déterminées et enregistrées suivant l'étape b) est effectué au moyen d'opérations vectorielles, sachant que, pour ce faire, on superpose de préférence par addition vectorielle les vecteurs de coloration déterminés dans l'étape a) pour chaque encre de traitement individuelle.
EP05715317A 2004-02-26 2005-02-12 Procede de reglage de la couleur dans des presses d'impression Expired - Lifetime EP1720705B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004009271A DE102004009271A1 (de) 2004-02-26 2004-02-26 Verfahren zur Farbregelung an Druckmaschinen
PCT/EP2005/001438 WO2005082620A1 (fr) 2004-02-26 2005-02-12 Procede de reglage de la couleur dans des presses d'impression

Publications (2)

Publication Number Publication Date
EP1720705A1 EP1720705A1 (fr) 2006-11-15
EP1720705B1 true EP1720705B1 (fr) 2010-05-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05715317A Expired - Lifetime EP1720705B1 (fr) 2004-02-26 2005-02-12 Procede de reglage de la couleur dans des presses d'impression

Country Status (7)

Country Link
US (1) US20070188778A1 (fr)
EP (1) EP1720705B1 (fr)
JP (1) JP2007523775A (fr)
CN (1) CN100436130C (fr)
AT (1) ATE468975T1 (fr)
DE (2) DE102004009271A1 (fr)
WO (1) WO2005082620A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201510652D0 (en) * 2015-06-17 2015-07-29 Beers Uk De Ltd Colour measurement of gemstones
CN112146759B (zh) * 2020-09-17 2023-05-05 杭州临安银杏装饰材料有限公司 一种凹版装饰纸颜色变化的在线监测方法

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Also Published As

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

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