EP0676285A1 - Gestion des couleurs dans une machine rotative offset pour feuilles - Google Patents

Gestion des couleurs dans une machine rotative offset pour feuilles Download PDF

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Publication number
EP0676285A1
EP0676285A1 EP95810055A EP95810055A EP0676285A1 EP 0676285 A1 EP0676285 A1 EP 0676285A1 EP 95810055 A EP95810055 A EP 95810055A EP 95810055 A EP95810055 A EP 95810055A EP 0676285 A1 EP0676285 A1 EP 0676285A1
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EP
European Patent Office
Prior art keywords
color
area coverage
fields
variation
printed
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.)
Granted
Application number
EP95810055A
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German (de)
English (en)
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EP0676285B2 (fr
EP0676285B1 (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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Application filed by Wifag Maschinenfabrik AG filed Critical Wifag Maschinenfabrik AG
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Publication of EP0676285B1 publication Critical patent/EP0676285B1/fr
Publication of EP0676285B2 publication Critical patent/EP0676285B2/fr
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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 ink guide on the printing press must be corrected in order 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.
  • measuring fields and / or image points serving as measuring fields are also printed and optically scanned after printing.
  • the returned light is evaluated.
  • the printed product to be checked and a number of calibration prints produced with specifically different ink layer thicknesses 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 , F g1 ) are.
  • each of these additional combination measurement fields 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 ⁇ F m3 in the third and the third primary color by the value ⁇ F g4 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 one individual color grid in the basic colors for each basic color, which in its respective color has an area coverage that corresponds to that of the same color in the first combination measuring field. They preferably additionally have at least one different individual color grid for each primary color. The area coverage of the other single-color grid corresponds to the varied area coverage of the corresponding additional combination measurement area.
  • the individual color grid fields in the preferred embodiment thus have the areas of coverage F c1 , F c2 , F m1 , F m3 , F g1 and F g4 .
  • the calibration prints additionally contain at least one each Single-color full-tone field per basic color; preferably exactly one per basic color.
  • the calibration print or prints can be printed separately or also in the printed product.
  • the measuring fields form a measuring field group, which is preferably arranged in the form of a measuring field block.
  • the color locus vectors R 1, R 2, R 3 and R 4 can be determined in a selected colorimetric coordinate system on these calibration prints by measurement with a colorimeter on the combination measuring fields.
  • the effective area coverage in the pressure F ec1 , F ec2 , F em1 , F em3 , F eg1 , F eg4 and likewise in the single color full tone fields by densitometric measurement with a filter characteristic corresponding to the individual field can also be determined by densitometric or other measurements Vc1 , D Vm1 , D Vg1 can be determined.
  • the color locus vectors, the solid color densities and the effective area coverage of the calibration prints are used according to the invention to determine two transformation functions A and B, which are a variation ⁇ D V1 of the solid color in the individual color solid tone fields caused by a change in the color layer thicknesses or a variation ⁇ F e1 of the effective area coverage in the individual areas Convert single color grid fields with the nominal area coverage F c1 , F m1 and F g1 into variations of the color locus vector of the first combination measuring field with the nominal area coverage (F c1 , F m1 , F g1 ).
  • the color locus vector in the selected coordinate system is repeatedly determined on the printed product to be checked by measurement with a color measuring device on the first combination measuring field, and for that one predefined target color locus vector-related deviation of the color locus vector ⁇ R 11 determined on the printed product is a combination of a variation ⁇ D V11 of the solid color in existing or imaginary single color solid fields caused by changing the ink layer thicknesses and an independent variation ⁇ F e11 of the effective area coverage in existing or imaginary single color halftone flat fields with the nominal field grid areas calculated.
  • the deviation ⁇ R 11 of the color locus vector corresponds exactly to the combined effect of the variations ⁇ D V11 and ⁇ F e11 via the transformation functions A and B.
  • the invention is further characterized in that the deviation of the color locus ⁇ R11 on the printed product is corrected in the sense that on the one hand the calculated variation ⁇ D V11 of the solid densities by adjusting the ink guide actuators on the printing press and on the other hand the calculated variation ⁇ F e11 of the effective area coverage by Change in the degree of area coverage when the color separations are made to disappear; further in that the
  • Transformation functions A and B linear, ie through two 3x3 matrices and are marked and that the relationship respectively. applies.
  • a deviation ⁇ R11 of the color locus vector determined on the printed product a combination of a variation ⁇ D V11 of the solid densities caused by a change in the ink layer thicknesses and a variation ⁇ F e11 of the area coverage independent of this is calculated such that at the same time applies where corresponds to the random portion of ⁇ R11 and represents the systematic, ie constant over several successive print jobs, share of ⁇ R11 .
  • a deviation ⁇ R11 of the color locus vector determined on the printed product a variation ⁇ D V11 of the solid density caused by changing the ink layer thicknesses is calculated, the variation ⁇ R11 corresponding exactly to the effect of the variation ⁇ D V11 via the transformation function A and that the deviation of the color locus vector ⁇ R11 on the printed product is corrected in the sense that the calculated variation ⁇ D V11 of the solid densities is made to disappear by adjusting the ink guide actuators on the printing press.
  • the invention can be used with advantage in web offset printing.
  • a measuring field group for recording color data of a printed product has a plurality of measuring fields, which can be optically scanned on a printed product to be checked or on
  • this measurement field group includes a first combination measurement field in which the basic colors with their nominal area coverage are printed one on top of the other, additional combination measurement fields in which the basic colors are printed with different nominal area coverage, each basic color being varied at least once in every additional combination measurement field, Furthermore, additional single-color grids in the primary colors, the first single-color grids in their respective primary colors having an area coverage that corresponds to that of the same color in the first combination measurement area.
  • second individual color grid fields are provided, which have an area coverage in their respective basic color, which corresponds to the varied area coverage of the same color in the additional combination measuring areas and finally additionally at least one individual color solid field for each basic color.
  • the printed product 30 to be checked and optimized 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 20 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 20 according to the same standard as the edition, i.e. the printed product to be checked and optimized is produced.
  • Further calibration prints 21, 22 and 23 also contain a measuring field block with respect to the arrangement of the measuring fields and their image structure, the measuring field blocks of the calibration prints 20 to 23 are identical.
  • the calibration prints 21, 22 and 23 are produced in a way that deviates from the applicable printing standard in that the color layer thickness of exactly one of the basic colors cyan, magenta and yellow is varied for each calibration print compared to the calibration print 20.
  • the color layer thickness differs from cyan, that of magenta on the calibration print and that of yellow on the calibration print 23. In principle, the deviations can go in the positive or negative direction.
  • the calibration prints 20 to 23 must also have other 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 with regard to the ink acceptance for the printed product 30.
  • the influence of the ink layer thickness is expressed in the differences between colorimetric and densitometric measurement values between the different calibration prints.
  • the influence of the variations in the area coverage, which are independent of changes in the ink layer thickness, is noticeable, however, in the differences in the measured values between the different measuring fields on one and the same calibration print.
  • the transformation functions A and B are 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 the generalizing wording in the claims to linear and non-linear systems does not break.
  • the matrix due to the stomach calculated are defined by measured values which originate from calibration pressure 20 alone. That means the matrix can be determined entirely on the basis of a single calibration pressure. In an extension of the method, it would be possible to have a separate matrix for several calibration prints to determine and then over all to form the mean. This measure could reduce the influence of random measurement errors.
  • the transformation functions obtained from the calibration prints can now be used to advantage if the quality of production prints is to be monitored and optimized.
  • the prerequisite for this is that the combination measuring field 1 is also printed in the printed product with the same nominal area coverage for cyan, magenta and yellow.
  • the color locus vector R 1 in the combination measuring field 1 is measured by measurement with a color measuring device.
  • the target color locus vector can either be a measurement value originating from a given template or come directly from the digital prepress.
  • ⁇ R 11M will in most cases be different from zero.
  • ⁇ R 11M would now be compensated for in every edition by adjusting the ink guide actuators on the printing press. If we now adopt the basic idea of color management in offset printing, we do not compensate for the systematic color locus deviation ⁇ R 11M by setting the printing press but by producing the color separations in the prepress stage by specifically influencing the area coverage.
  • the method according to the invention makes it possible to use an image location with a suitable image structure instead of the combination measuring field 1 on the printed product 30.
  • the space occupied by the combination measuring field 1 on the printed product can thereby be saved.
  • 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 extended in the direction of the four-color overprinting, in that a proportion of the printing ink black is also permitted in the combination measuring fields on the calibration prints 20 to 23 and the printed product 30.
  • 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)
  • Control Of Velocity Or Acceleration (AREA)
  • Printing Methods (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Rotary Presses (AREA)
  • Coloring (AREA)
  • Fixing For Electrophotography (AREA)
EP95810055A 1994-01-31 1995-01-30 Gestion des couleurs dans une machine rotative offset pour feuilles Expired - Lifetime EP0676285B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4402828 1994-01-31
DE4402828A DE4402828C2 (de) 1994-01-31 1994-01-31 Messfeldgruppe und Verfahren zur Qualitätsdatenerfassung unter Verwendung der Messfeldgruppe

Publications (3)

Publication Number Publication Date
EP0676285A1 true EP0676285A1 (fr) 1995-10-11
EP0676285B1 EP0676285B1 (fr) 1997-11-12
EP0676285B2 EP0676285B2 (fr) 2001-11-14

Family

ID=6509083

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95810055A Expired - Lifetime EP0676285B2 (fr) 1994-01-31 1995-01-30 Gestion des couleurs dans une machine rotative offset pour feuilles

Country Status (7)

Country Link
US (1) US5761327A (fr)
EP (1) EP0676285B2 (fr)
AT (1) ATE160110T1 (fr)
DE (2) DE4402828C2 (fr)
DK (1) DK0676285T4 (fr)
ES (1) ES2112031T5 (fr)
FI (1) FI110175B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6580524B1 (en) 1998-09-29 2003-06-17 Man Roland Druckmaschinen Ag Method for profiling and calibrating a digitally controllable printing machine having a permanent printing plate

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5978506A (en) * 1995-12-28 1999-11-02 Ricoh & Company, Ltd. Colorant-independent color balancing methods and systems
ES2160315T3 (es) 1996-09-23 2001-11-01 Wifag Maschf Grupo de campos de medicion y metodo para detectar datos de calidad en las ediciones de impresion multicolor.
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
DE19639014C2 (de) * 1996-09-23 1998-12-03 Wifag Maschf Messfeldgruppe und Verfahren zur Erfassung von optisch drucktechnischen Größen im Mehrfarben-Auflagendruck
US6038374A (en) * 1997-06-04 2000-03-14 Hewlett-Packard Company System and method for constructing calibrated color tables in color image reproduction systems using stochastic supersampling
DE19738992A1 (de) * 1997-09-05 1999-03-11 Empa Messfeldblock und Verfahren zur Erfassung von Qualidätsdaten im Mehrfarben-Auflagendruck
JP3781941B2 (ja) * 2000-03-13 2006-06-07 大日本スクリーン製造株式会社 印刷装置
CN1505564A (zh) * 2001-03-02 2004-06-16 ������������˹��˾Dba Mgi���� 印刷调节系统和方法
WO2003011604A2 (fr) 2001-07-30 2003-02-13 The Ackley Martinez Company Dba Mgi Studio Systeme et procede de compensation par adjuvant pour un systeme
JP2004536730A (ja) * 2001-07-30 2004-12-09 ジ アックレイ マルティネス カンパニー デイビーエイ エムジーアイ ステューディオ 色を管理・処理するシステムと方法
US7605959B2 (en) 2005-01-05 2009-10-20 The Ackley Martinez Company System and method of color image transformation
KR100679052B1 (ko) * 2006-01-04 2007-02-06 삼성전자주식회사 최적 선호색 편집 장치 및 방법

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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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* 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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6580524B1 (en) 1998-09-29 2003-06-17 Man Roland Druckmaschinen Ag Method for profiling and calibrating a digitally controllable printing machine having a permanent printing plate

Also Published As

Publication number Publication date
ATE160110T1 (de) 1997-11-15
ES2112031T5 (es) 2002-05-16
DE4402828C2 (de) 2001-07-12
DE59500965D1 (de) 1997-12-18
ES2112031T3 (es) 1998-03-16
US5761327A (en) 1998-06-02
DK0676285T3 (da) 1998-07-27
FI950393A0 (fi) 1995-01-30
DE4402828A1 (de) 1995-08-10
EP0676285B2 (fr) 2001-11-14
FI110175B (fi) 2002-12-13
EP0676285B1 (fr) 1997-11-12
FI950393A (fi) 1995-08-01
DK0676285T4 (da) 2002-02-18

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