EP0668164A1 - Acquisition des données de qualité dans une machine rotative offset pour feuilles - Google Patents

Acquisition des données de qualité dans une machine rotative offset pour feuilles Download PDF

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Publication number
EP0668164A1
EP0668164A1 EP95810054A EP95810054A EP0668164A1 EP 0668164 A1 EP0668164 A1 EP 0668164A1 EP 95810054 A EP95810054 A EP 95810054A EP 95810054 A EP95810054 A EP 95810054A EP 0668164 A1 EP0668164 A1 EP 0668164A1
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EP
European Patent Office
Prior art keywords
color
fields
printed
area coverage
measuring
Prior art date
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Granted
Application number
EP95810054A
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German (de)
English (en)
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EP0668164B1 (fr
Inventor
Stephan Papritz
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.)
Wifag Maschinenfabrik AG
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Wifag Maschinenfabrik AG
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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

  • color management is that color templates in digital prepress are defined independently of output devices and materials. The colors are therefore described in a colorimetric coordinate system standardized by the Commission Internationale de l'Eclairage (CIE), such as XYZ, CIELAB or CIELUV. If multicolored images of this type are output on paper using a system calibrated in terms of color management, this ensures that the color appearance of the output is always the same, regardless of the output process used.
  • CIE Commission Internationale de l'Eclairage
  • EP 0 196 431 B1 describes a method and a device for achieving a uniform printing result on a multi-color offset printing machine that works in an autotypical manner. Characteristic of this solution is the measurement of ink layer thicknesses (solid ink densities) and halftone dot sizes (area coverage) at measuring fields, which are also printed for each printing ink in each inking zone of the printing machine. The ink guide actuators on the printing press are set automatically on the basis of these densitometric measured values.
  • EP 0 196 431 B1 has a further disadvantageous property in that features which have no direct relation to the color appearance of the printed product are measured with the solid and screen density of the individual colors.
  • This deficiency can be countered by the fact that so-called combination measuring fields, i.e. Measuring fields in which the primary colors involved in the printing are printed on one another in a raster tone, provided and measured colorimetrically.
  • Colorimetric measurement values obtained in this way can refer to the XYZ color space, which is based on the sensitivity function of the average human eye, or to the color spaces CIELUV or CIELAB derived from the XYZ system, all of which have been standardized by the CIE (Commission Internationale de l'Eclairage) .
  • the colorimetric measurement on combination measuring fields has the advantage that it enables a statement about the interaction of all colors involved in a multicolor printing.
  • the colorimetric measurement values directly say something about how the combination measuring field or the printed product appears in color to the human viewer.
  • Another advantage is that the combination measuring fields can be replaced by image locations with a suitable image structure, if necessary.
  • the disadvantage of colorimetric measurement methods is that they do not provide direct information about the process control. A deviation in the color location, for example, does not allow any conclusions to be drawn about how the color guidance is corrected on the printing press must to reduce the deviation.
  • EP 0 321 402 A1 and EP 0 408 507 A1 describe linear transformations for converting variations in full tone or screen density into variations in the color location of combination measuring fields in the CIELUV or CIELAB color spaces.
  • the object of the invention is to provide measurement fields for recording color data of a printed product, which are also suitable for quality data acquisition in web offset printing, in particular for statistical quality data acquisition, and whose use in such a method for quality data acquisition in particular enables a method that individual, several and preferably meets all of the above requirements.
  • the method and the measuring fields developed for it should also be able to be used in newspaper offset print runs.
  • measurement fields and / or image points serving as measurement fields are also printed and optically scanned after printing.
  • the returned light is evaluated.
  • the printed product to be checked and one or more calibration prints each have a first combination measuring field in which the basic colors, usually the three colors cyan, magenta and yellow, are overprinted with the nominal area coverage (F c1 , F m1 , Fg i ).
  • at least one other primary color is varied, for example the first primary color by the value ⁇ F c2 in the second, the second primary color by the value AF m3 in the third and the third primary color by the value AFg 4 in the fourth field.
  • the number of additional combination measuring fields and the number of colors per combination measuring field preferably corresponds to the number of basic colors.
  • the calibration prints additionally have at least two individual color grids in the primary colors for each primary color, one each in its respective color having an area coverage that of the same color in the first Combination measuring field corresponds.
  • the area coverage of the other single color grid corresponds to the varied area coverage of the corresponding additional combination measurement area.
  • the single-color grids therefore have the area coverage F c1 , F c2 , F m1 , F m3 , Fg 1 and Fg 4 .
  • the calibration print or prints can be printed separately or also in the printed product.
  • the color locus vectors R 1 , R 2 , R 3 and R4 can be determined in a selected colorimetric coordinate system on these calibration prints by measurement with a color measuring device on the combination measuring fields.
  • the respective raster density values D c1 , D c2 , D m1 , D m3 , Dg 1 and Dg 4 can be determined by densitometric measurement with a filter characteristic corresponding to the individual field.
  • the color locus vectors and the screen density values of one or more calibration prints are used according to the invention for determining a transformation function L, which is a variation converted the screen density in the individual color grids with the nominal area coverage F c1 , F m1 , Fg l in variations of the color locus AR of the first combination measuring field with the nominal area coverage F c1 , F m1 , Fg l .
  • the color locus vector R 11 should be determined repeatedly in the selected coordinate system on the printed product to be checked by measurement with a color measuring device on the first combination measuring field.
  • the invention can be used with advantage in web offset printing.
  • a measuring field group for recording color data of a printed product in particular for recording quality data in web offset production printing, has a plurality of measuring fields, which are optically scanned and printed on a printed product to be checked or on a calibration print.
  • this measuring field group includes a first combination measuring field in which the basic colors with their nominal area coverage are printed on top of each other, additional combination measuring fields in which the basic colors are printed with different nominal area coverage, each basic color being varied at least once and in each additional combination measuring field at least one other basic color being varied and further additional single-color grid fields in the basic colors, the first single-grid color fields in their respective basic color having an area coverage that corresponds to that of the same color in the first combination measurement area, and second individual grid color areas in their respective basic color have an area coverage level that corresponds to the varied area coverage of the same color in the additional combination measurement areas .
  • the printed product 50 to be checked in the edition contains at least the combination measuring field 1 of the measuring fields described, in which the basic colors cyan, magenta and yellow with the nominal area coverage (F c1 , F m1 , F g1 ) are overprinted .
  • an image point with an identical image structure can also serve as a combination measuring field.
  • the calibration print 40 is used in particular with regard to the color material, the color layer thickness and the dot gain, i.e. the enlargement of the area coverage from the film template or the printing plate to the print, printed under standardized conditions. These conditions were set for the print run, for example by UGRA in Switzerland or FOGRA in Germany. It does not matter for the principle of operation whether the method according to the invention is used in newspaper or commercial web offset. The only essential is the requirement that the calibration print 40 according to the same standard as the edition, i.e. the printed product to be checked and optimized is produced.
  • a further condition must be met when producing the calibration pressure 40.
  • the calibration print In addition to the measuring field blocks, the calibration print must also have additional areas printed with all primary colors, so that sufficient color acceptance is guaranteed at the location of the measuring field block in the paper running direction. The design of these areas is free. Analogous considerations apply to ink acceptance for the printed product 50.
  • the transformation function L is non-linear. Since we usually deal with relatively small variations around a standardized operating point in printing practice, it is permissible to linearize the relationships. In the interest of clarity, the method according to the invention is explained below using a linearized model. This does not detract from the generalization of claims 3 to 8 to linear and nonlinear systems.
  • the matrix L is based on the matrices calculated. are defined by measured values which originate from calibration pressure 40 alone. This means that the matrix L can be determined completely on the basis of a single calibration pressure.
  • the transformation function obtained from calibration printing can now be used to advantage if the quality of production prints is to be monitored.
  • the prerequisite for this is that the combination measuring field 1 is also printed in the printed product 50 with the same nominal area coverage for cyan, magenta and yellow as in the calibration print 40.
  • the color locus vector Rn in the combination measuring field 1 is measured on samples of the printed product 50 taken by sampling by measurement with a color measuring device.
  • the target color locus vector can either be a measured value originating from a given template or come directly from the digital prepress.
  • the variations associated with the color locus deviation ⁇ R 11 can the screen density of the basic colors cyan, magenta and yellow can be calculated on the printed product 50:
  • Another advantage of the method is that the colorimetric measurement on the combination measuring field 1 of the printed product 50 checks a quantitative criterion that directly tells the print shop customer how the average human viewer perceives the color appearance of the printed product.
  • the method according to the invention makes it possible to use an image location with a suitable image structure instead of the combination measurement field 1 on the printed product 50.
  • the space occupied by the combination measuring field 1 on the printed product can thereby be saved.
  • the complete measurement field block of the calibration print 40 is also printed in the print product 50, so that the actual calibration print is dispensed with and a calibration copy of the print product that is found to be good can take the place of the calibration print. It is easily possible to use the first good copy of the edition instead of the calibration print 40 to determine the transformation function L.
  • the measurement data is collected with.
  • densitometric values are determined using a densitometer, a spectrophotometer, a video camera or any other suitable device.
  • colorimetric measurements with spectrophotometers, three-range color measuring devices, video cameras or other suitable devices are possible without breaking the invention.
  • tools are used to further process the measurement data.
  • the method according to the invention can also be expanded in the direction of four-color overprinting, in that a proportion of the printing ink black is also permitted in the combination measuring fields on the calibration print 40 and the printed product 50.
  • the only condition is that the nominal area coverage of black is the same in all four combination measuring fields.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Multi-Process Working Machines And Systems (AREA)
  • Paper (AREA)
  • Magnetic Record Carriers (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
EP95810054A 1994-01-31 1995-01-30 Acquisition des données de qualité dans une machine rotative offset pour feuilles Expired - Lifetime EP0668164B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4402784A DE4402784C2 (de) 1994-01-31 1994-01-31 Messfeldgruppe und Verfahren zur Qualitätsdatenerfassung unter Verwendung der Messfeldgruppe
DE4402784 1994-01-31

Publications (2)

Publication Number Publication Date
EP0668164A1 true EP0668164A1 (fr) 1995-08-23
EP0668164B1 EP0668164B1 (fr) 2000-04-26

Family

ID=6509062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95810054A Expired - Lifetime EP0668164B1 (fr) 1994-01-31 1995-01-30 Acquisition des données de qualité dans une machine rotative offset pour feuilles

Country Status (7)

Country Link
US (1) US5730470A (fr)
EP (1) EP0668164B1 (fr)
AT (1) ATE192081T1 (fr)
DE (2) DE4402784C2 (fr)
DK (1) DK0668164T3 (fr)
ES (1) ES2147828T3 (fr)
FI (1) FI111140B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19533810A1 (de) * 1995-09-13 1997-03-20 Heidelberger Druckmasch Ag Verfahren zum Steuern der Bebilderung eines Druckformträgers für eine Druckmaschine

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19639014C2 (de) * 1996-09-23 1998-12-03 Wifag Maschf Messfeldgruppe und Verfahren zur Erfassung von optisch drucktechnischen Größen im Mehrfarben-Auflagendruck
DE59703899D1 (de) 1996-09-23 2001-08-02 Wifag Maschf Messfeldgruppe und Verfahren zur Erfassung von Qualitätsdaten im Mehrfarben Auflagendruck
DE19738923A1 (de) * 1997-09-05 1999-03-11 Wifag Maschf Messfeldblock und Verfahren zur Erfassung von Qualitätsdaten im Mehrfarben-Auflagendruck
DE19638967C2 (de) * 1996-09-23 1998-12-17 Empa Messfeldgruppe und Verfahren zur Erfassung von optisch drucktechnischen Größen im Mehrfarben-Auflagendruck
DE19738992A1 (de) * 1997-09-05 1999-03-11 Empa Messfeldblock und Verfahren zur Erfassung von Qualidätsdaten im Mehrfarben-Auflagendruck
AU2009276622B2 (en) * 2008-07-29 2014-07-10 Mei, Inc. Classifying and discriminating an item of currency based on the item's spectral response

Citations (6)

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US4310248A (en) * 1980-04-24 1982-01-12 Meredith Nolan J Color control system
EP0196431A2 (fr) * 1985-03-21 1986-10-08 Felix Brunner Procédé, dispositif de réglage et moyens auxiliaires pour l'obtention d'un résultat d'impression uniforme au moyen d'une machine d'impression offset polychrome fonctionnant suivant le procédé de similigravure
EP0321402A1 (fr) * 1987-12-16 1989-06-21 GRETAG Aktiengesellschaft Procédé de commande ou du réglage de l'encrage d'une presse à imprimer
EP0408507A1 (fr) * 1989-07-14 1991-01-16 GRETAG Aktiengesellschaft Méthode de détermination des écarts de couleur entre deux surfaces tramÀ©es imprimées avec une machine d'impression ainsi que méthode de commande ou réglage de l'impression couleurs d'une machine à imprimer
EP0421003A1 (fr) * 1989-10-02 1991-04-10 grapho metronic Mess- und Regeltechnik GmbH & Co. Méthode pour contrôler l'apport d'encre dans une machine d'impression
EP0505323A1 (fr) * 1991-03-21 1992-09-23 Maschinenfabrik Wifag Procédé pour le réglage des grandeurs des points de trame pour une presse rotative à imprimer offset

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NL7902713A (nl) * 1979-04-06 1980-10-08 Nl Omroep Stichting Kleurstelsel.
DE3127381A1 (de) * 1981-07-10 1983-01-27 Salvat Editores, S.A., Barcelona Messorgane fuer im geschlossenen kreis arbeitende systeme zur ueberwachung und korrektur des drucks bei offset-druckmaschinen
WO1983000570A1 (fr) * 1981-07-30 1983-02-17 Müller, Hans Procede de tramage d'images en demi-teinte
JPS59206839A (ja) * 1983-05-10 1984-11-22 Toppan Printing Co Ltd 網点面積率入力装置
DE3600200A1 (de) * 1986-01-07 1987-10-22 Michael M Micklei Farbtabelle zur reproduzierbaren bestimmung von farben
FR2596894B1 (fr) * 1986-04-04 1994-07-29 Publigrafa Sarl Systeme de creation d'images notamment de maquettes pour l'impression de documents publicitaires, tels que des emballages, des etiquettes ou autres
DE3626423A1 (de) * 1986-08-05 1988-02-11 Deutsche Forsch Druck Reprod Verfahren und vorrichtung zur beeinflussung der farblichen erscheinung einer farbflaeche bei einem druckvorgang
DE3643721A1 (de) * 1986-12-20 1988-06-30 Heidelberger Druckmasch Ag Druckkontrollstreifen
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DE3830732C2 (de) * 1988-09-09 2000-05-25 Heidelberger Druckmasch Ag Verfahren zur Feuchtmittelführung bei einer Offset-Druckmaschine
US5205211A (en) * 1989-01-25 1993-04-27 Wallace Edwards Printed product having adjacent or closely spaced multicolour halftone dots
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4310248A (en) * 1980-04-24 1982-01-12 Meredith Nolan J Color control system
EP0196431A2 (fr) * 1985-03-21 1986-10-08 Felix Brunner Procédé, dispositif de réglage et moyens auxiliaires pour l'obtention d'un résultat d'impression uniforme au moyen d'une machine d'impression offset polychrome fonctionnant suivant le procédé de similigravure
EP0321402A1 (fr) * 1987-12-16 1989-06-21 GRETAG Aktiengesellschaft Procédé de commande ou du réglage de l'encrage d'une presse à imprimer
EP0408507A1 (fr) * 1989-07-14 1991-01-16 GRETAG Aktiengesellschaft Méthode de détermination des écarts de couleur entre deux surfaces tramÀ©es imprimées avec une machine d'impression ainsi que méthode de commande ou réglage de l'impression couleurs d'une machine à imprimer
EP0421003A1 (fr) * 1989-10-02 1991-04-10 grapho metronic Mess- und Regeltechnik GmbH & Co. Méthode pour contrôler l'apport d'encre dans une machine d'impression
EP0505323A1 (fr) * 1991-03-21 1992-09-23 Maschinenfabrik Wifag Procédé pour le réglage des grandeurs des points de trame pour une presse rotative à imprimer offset

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19533810A1 (de) * 1995-09-13 1997-03-20 Heidelberger Druckmasch Ag Verfahren zum Steuern der Bebilderung eines Druckformträgers für eine Druckmaschine
US6029576A (en) * 1995-09-13 2000-02-29 Heidelberger Druckmaschinen Ag Method for controlling image formation on a printing form carrier for a printing press
DE19533810B4 (de) * 1995-09-13 2006-04-20 Heidelberger Druckmaschinen Ag Verfahren zur Steuerung einer Bebilderung eines Druckformträgers für eine Druckmaschine

Also Published As

Publication number Publication date
DE59508206D1 (de) 2000-05-31
DE4402784C2 (de) 2001-05-31
FI950392A (fi) 1995-08-01
DK0668164T3 (da) 2000-09-25
ATE192081T1 (de) 2000-05-15
FI111140B (fi) 2003-06-13
US5730470A (en) 1998-03-24
FI950392A0 (fi) 1995-01-30
ES2147828T3 (es) 2000-10-01
EP0668164B1 (fr) 2000-04-26
DE4402784A1 (de) 1995-10-12

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