EP0649743A1 - Procédé pour contrôler l'apport de couleur dans une presse fonctionnant suivant le procédé de similigravure - Google Patents

Procédé pour contrôler l'apport de couleur dans une presse fonctionnant suivant le procédé de similigravure Download PDF

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Publication number
EP0649743A1
EP0649743A1 EP94115333A EP94115333A EP0649743A1 EP 0649743 A1 EP0649743 A1 EP 0649743A1 EP 94115333 A EP94115333 A EP 94115333A EP 94115333 A EP94115333 A EP 94115333A EP 0649743 A1 EP0649743 A1 EP 0649743A1
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Prior art keywords
color
cmy
values
cmyk
printing
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Granted
Application number
EP94115333A
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German (de)
English (en)
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EP0649743B1 (fr
Inventor
Hans-Joachim Dr. Six
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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MAN Roland Druckmaschinen AG
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Priority claimed from DE4431270A external-priority patent/DE4431270C2/de
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply

Definitions

  • the invention relates to a method for controlling the color guidance of an autotypical working printing press according to the preamble of claim 1.
  • the visual color impression of offset printing products is created in a known manner through the interplay of subtractive and additive color mixing.
  • the reason for this is that the individual halftone dots of each printing ink are printed in different sizes both side by side and overlapping one another to a greater or lesser extent.
  • the printing inks used are glazed, i.e. the effect corresponds to a filter lying on the white substrate.
  • the color direction of the combined printing is determined both by the layer thickness of the applied printing ink and by the size of the halftone dots (geometric area coverage).
  • This method works colorimetrically, i.e. the determined color locations and color distances also allow conclusions regarding the visual color impression. Because of the described way of calculating positioning commands for the color guide via the partial derivatives of the color coordinates according to the color densities of the printing inks involved, this principle seems to only work with measuring fields that are also printed. This font alone does not identify a way in which setting commands for the color guidance can be obtained by measurements directly in the printed image, the subject.
  • a method for colorimetric evaluation of printed products is known from DD 227 094 A1. Measuring devices in the machine determine the color coordinates of certain test areas and, based on the relationship between Neugebauer, the area coverage printed colors. If the color black is printed in addition to the chromatic colors, a second colorimetric measuring device for this color is necessary, which is to be regarded as disadvantageous.
  • EP 0 143 744 A1 discloses a method for assessing the print quality and for regulating the color guidance.
  • the reflectances in four spectral ranges are measured on image elements in the subject using one or more measuring heads.
  • the color densities for the chromatic colors and spectral reflectance in the infrared range for the printing ink black are determined.
  • area coverings are determined (unmasked) using the Neugebauer equations. This is done on the same image locations of the copies printed on the machine as well as on a target template. Control commands for the color control of the printing press can be derived from the target / actual comparison of the surface coverings.
  • the object of the present invention is to extend a method according to the preamble of claim 1 such that the control of the color guidance is possible with great accuracy.
  • test areas are specified on the template sheet, which are either particularly important for the image, show particularly typical or difficult color nuances or are otherwise typical of the overall image structure. In this example it should be assumed that these test areas were all created by printing together the three chromatic colors and the black color in the halftone area.
  • test area of the template sheet and the corresponding test area of the printed sheet is described.
  • the remaining test areas are processed accordingly.
  • the spectral reflectance of the test area on the template sheet and the spectral reflectance of the corresponding test area on the printed sheet are recorded by means of a spectrophotometer.
  • the X, Y, Z components of the color values are determined from these spectral remissions, using the standardized sensitivity curves of a CIE normal observer.
  • color locations of the CIE-LUV color space can be determined. For this test area of the template, you get a target color location. The color location of the corresponding test area in the printed sheet thus represents the actual color location.
  • a spectrophotometer which also delivers spectral intensities in the near infrared at wavelengths between 0.85 ⁇ and 1.0 ⁇ .
  • a narrow-band color density for a wavelength L (IR) is now determined in this specified wavelength range of the near infrared. This narrowband color density is also referred to as DIR.
  • a color measuring device (spectral; triple range), which is designed in a known manner and to which an infrared color density measuring device is connected (beam splitter) can also be used in the method according to the invention.
  • the color location and the infrared color density are then recorded by two measuring systems.
  • the measuring device which is to be designated generally as a photoelectric scanning device, is attached to an automatically controlled device which can be moved in one plane.
  • a large number of stored test areas can be approached and automatically measured.
  • the template is first placed on the surface of this device and then measured.
  • the printed sheet method is taken into account when determining control commands for the color guide.
  • a color location can be determined from the infrared color density values DIR of the test area in the template and printed sheet described above, which results when only the chromatic colors cyan, magenta and yellow are printed become.
  • X (CMYK), Y (CMYK), Z (CMYK) the standard color values of the test area in the template or Labeled sheet.
  • X (CMY), Y (CMY), Z (CMY) are understood to mean the corresponding standard color values of the color location, which results when only the chromatic colors cyan, magenta, yellow are printed.
  • X (CMY) ax (1) X (CMYK) + ax (2)
  • Y (CMY) ay (1) * Y (CMYK) + ay (2)
  • Z (CMY) az (1) Z (CMYK) + az (2) .
  • the standard color values of the four-color overprint in the test area are converted linearly into another color location.
  • the conversion coefficients ax (1), ax (2); ay (1), ..., az (2) are not constant parameters, but, as has been found, in each case a function of the measured infrared color density DIR. The relationship between these parameters and the infrared color density DIR is determined empirically.
  • FIG. 1 shows a section of an exemplary arrangement of the measuring fields.
  • the proportion of printing area is varied both for the three chromatic colors and for the printing color black in the overprinting of the four colors.
  • the gradation of the individual measuring fields can be such that the proportions of printing areas are changed by 10%, for example.
  • Fig. 1 shows that pairs of measuring fields are arranged on the sample sheet, the three chromatic colors C, M, Y with a predetermined screen tone in a measuring field CMY and the three chromatic colors C, M, Y with the same in the adjacent measuring field CMYK Halftone (portion of the printing area) and additionally the color black K with the specified halftone value.
  • the pairs of measuring fields can be arranged in a matrix, that is, in rows 1, 2, 3, ... and columns A, B, C, ....
  • a pair of measuring fields is highlighted in dashed lines.
  • the matrix-like arrangement of the measuring field pairs CMY, CMYK shown in FIG. 1 it can be provided that in columns A, B, C,...
  • the screen tone value of the color black K in the metering area CMYK of the four-color overprinting is constant and the screen tone values of the three bright colors varies. This means that in a column A, B, C, ... in different rows 1, 2, 3, ... the three chromatic colors produce different color fields due to the variation of the halftone values.
  • the color values X, Y, Z in one Column detected on the measuring field pairs CMY / CMYK and additionally determined the infrared color density DIR at the measuring fields CMYK with the overprinting of the four colors, so it can be seen that along the column the color values X, Y, Z due to the different halftone values of the Change chromatic colors in a wide range.
  • the infrared color density DIR remains almost constant, since the color black was always printed along the column in the measuring fields CMYK with the same proportion of the printing area.
  • CMYK standard color value X
  • X the standard color value X
  • the ordinate represents those standard color values X (CMY) that result in the measuring fields CMY, in which only the three chromatic colors C, M, Y are involved.
  • the bisector between the ordinate and the abscissa represents the straight line that results if the color black is not printed.
  • FIG. 2 Various straight lines are plotted in FIG. 2, the increase of which increases with the proportion of the printing surface of the printing ink black K in the measuring field CMYK, which is indicated by the arrow.
  • Each line is a best-fit line through a large number of individual measuring points in a series of measurements.
  • Each straight line of a measurement series is also assigned a (averaged) value of the infrared color density DIR.
  • ay (2) fkty2 (DIR)
  • az (1) fktz1 (DIR)
  • az (2) fktz2 (DIR) determined.
  • the conversion of the standard color values X, Y, Z of the four-color overprint to the standard color values of the hypothetically resulting three-color overprint according to the above approach takes into account the fact that the printing color is black does not only represent a pure "filter function", that is to say that the corresponding standard color values X (CMYK), Y (CMYK), Z (CMYK) are not just attenuated by a certain amount.
  • the presence of the printing ink black does not only result in a pure change in the brightness of a four-color overprint compared to the associated overprinting of the three chromatic colors C, M, Y.
  • the effective color area for the color black EFF black is determined via an empirical relationship between the infrared color density DIR and this effective color area. Pressure tests are carried out to determine these parameters.
  • a series of halftone patches of the color black is also printed on a test sheet, the halftone tone value being varied in stages or continuously and the measured infrared color density DIR being plotted against the effective color area EFF, for example measured by video or planimetry.
  • EFF (K) fkt (DIR) .
  • a system of modified Neugebauer equations is used to calculate the effective color areas EFF for the three chromatic colors.
  • the modified Neugebauer equations used in the invention are based on the same mathematical approach as the well-known Neugebauer equation.
  • the standard color values of a three-color overprint can be calculated by the Neugebauer equations by linking the geometric surface coverings of the three chromatic colors in full tone and paper white and also the standard color values of the corresponding full tone overprint.
  • the effective color areas EFF of the three chromatic colors described are used in the modified Neugebauer equations instead of the geometric area coverings. Furthermore, it is provided that instead of the standard color values for the respective solid color areas (single and together) standard color values are used which take into account the changes caused by scattering effects on printed screen areas. This data is determined on a printed sample board, which contains a certain amount of defined CMY color fields, which essentially consist of screened color areas - individually and also in overprinting - of defined parts.
  • the system of Neugebauer equations consists of three equations (for one standard color value of the CMY color field).
  • the Neugebauer equation is shown here in a vector representation.
  • EFF (C), EFF (M), EFF (Y) mean, as already mentioned, the effective color areas for the three chromatic colors C, M, Y.
  • X (W), X (C), X (M), X (Y), Y (W), Y (C), ...., Z (Y) are the color values of the paper white W or a cyan-magenta or yellow-colored grid;
  • X (CM), X (CY), X (MY), X (CMY) the corresponding standard color values for two or three-color halftone fields printed one above the other. These values are determined in test prints (sample board) and saved for later calculation.
  • the effective color areas for both the color black and the three chromatic colors are calculated for each test area of the template sheet and the printing sheet. Then the differences between the effective color areas of a test area of the template sheet and the printed sheet are formed. These differences are then converted into control commands for the ink guide elements via empirical relationships, which take into account in particular the inking unit behavior, the inking unit structure of the printing press and the properties of the printing inks used. If several test areas are evaluated in one ink metering zone, an optimally achievable difference in the effective ink area for the respective printing ink is formed (e.g. mean value).

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP94115333A 1993-10-21 1994-09-29 Procédé pour contrÔler l'apport de couleur dans une presse fonctionnant suivant le procédé de similigravure Expired - Lifetime EP0649743B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4335853 1993-10-21
DE4335853 1993-10-21
DE4431270 1994-09-02
DE4431270A DE4431270C2 (de) 1993-10-21 1994-09-02 Verfahren zur Steuerung der Farbführung einer autotypisch arbeitenden Druckmaschine

Publications (2)

Publication Number Publication Date
EP0649743A1 true EP0649743A1 (fr) 1995-04-26
EP0649743B1 EP0649743B1 (fr) 1997-04-09

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EP94115333A Expired - Lifetime EP0649743B1 (fr) 1993-10-21 1994-09-29 Procédé pour contrÔler l'apport de couleur dans une presse fonctionnant suivant le procédé de similigravure

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EP (1) EP0649743B1 (fr)
AT (1) ATE151349T1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0795400A1 (fr) * 1996-03-12 1997-09-17 Goss Graphic Systems, Inc. Dispositif pour aligner automatiquement une image d'une copie de production avec une image d'une copie de référence dans un système de contrÔle d'une machine d'impression
EP0884180A1 (fr) * 1993-06-25 1998-12-16 Heidelberger Druckmaschinen Aktiengesellschaft Procédé de commande ou de regulation des operations effectuées par une machine d'impression
EP0914945A3 (fr) * 1997-11-06 1999-11-03 Heidelberger Druckmaschinen Aktiengesellschaft Procédé pour régler l'encrage dans une machine d'impression
DE102007029211A1 (de) * 2007-06-25 2009-01-08 Heidelberger Druckmaschinen Ag Verbesserter Druckkontrollstreifen zur Farbmessung auf Bedruckstoffen
CN104869282A (zh) * 2014-02-21 2015-08-26 海德堡印刷机械股份公司 色谱方面的特性化数据的换算

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0096090A1 (fr) * 1982-06-04 1983-12-21 DR.-ING. RUDOLF HELL GmbH Procédé et dispositif pour la préparation des épreuves couleurs pour l'impression en plusieurs couleurs
DE3714179A1 (de) * 1987-04-29 1988-11-17 Forschungsgesellschaft Fuer Dr Verfahren zur steuerung der farbgebung im mehrfarbendruck
EP0324718A1 (fr) * 1988-01-14 1989-07-19 GRETAG Aktiengesellschaft Procédé et dispositif pour régler l'encre dans une machine à imprimer
GB2222112A (en) * 1988-08-11 1990-02-28 Polygraph Leipzig Monitoring print quality in multi-colour offset printing machines.
WO1991012500A1 (fr) * 1990-02-09 1991-08-22 Gordon Phillips Limited Ameliorations concernant la mesure des couleurs
JPH04238230A (ja) * 1991-01-23 1992-08-26 Mitsubishi Heavy Ind Ltd 印刷物の色判別方法
JPH054333A (ja) * 1991-06-26 1993-01-14 Mitsubishi Heavy Ind Ltd 多色印刷機用見当制御方法および装置
JPH05162294A (ja) * 1991-12-16 1993-06-29 Toshiba Corp 印刷物の検査装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0096090A1 (fr) * 1982-06-04 1983-12-21 DR.-ING. RUDOLF HELL GmbH Procédé et dispositif pour la préparation des épreuves couleurs pour l'impression en plusieurs couleurs
DE3714179A1 (de) * 1987-04-29 1988-11-17 Forschungsgesellschaft Fuer Dr Verfahren zur steuerung der farbgebung im mehrfarbendruck
EP0324718A1 (fr) * 1988-01-14 1989-07-19 GRETAG Aktiengesellschaft Procédé et dispositif pour régler l'encre dans une machine à imprimer
GB2222112A (en) * 1988-08-11 1990-02-28 Polygraph Leipzig Monitoring print quality in multi-colour offset printing machines.
WO1991012500A1 (fr) * 1990-02-09 1991-08-22 Gordon Phillips Limited Ameliorations concernant la mesure des couleurs
JPH04238230A (ja) * 1991-01-23 1992-08-26 Mitsubishi Heavy Ind Ltd 印刷物の色判別方法
JPH054333A (ja) * 1991-06-26 1993-01-14 Mitsubishi Heavy Ind Ltd 多色印刷機用見当制御方法および装置
JPH05162294A (ja) * 1991-12-16 1993-06-29 Toshiba Corp 印刷物の検査装置

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 17, no. 268 (M - 1416) 25 May 1993 (1993-05-25) *
PATENT ABSTRACTS OF JAPAN vol. 17, no. 4 (P - 1464) 6 January 1993 (1993-01-06) *
PATENT ABSTRACTS OF JAPAN vol. 17, no. 565 (M - 1495) 13 October 1993 (1993-10-13) *
SCHLÄPFER K.: "Die Definition von Farben und Farbräumen in der digitalen Bildverarbeitung der Druckvorstufe.", DEUTSCHER DRUCKER, vol. 27, no. 13, 11 April 1991 (1991-04-11), OSTFILDERN DE, pages W55 - W59, XP000201570 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0884180A1 (fr) * 1993-06-25 1998-12-16 Heidelberger Druckmaschinen Aktiengesellschaft Procédé de commande ou de regulation des operations effectuées par une machine d'impression
US6050192A (en) * 1993-06-25 2000-04-18 Heidelberger Druckmaschinen Ag Process and arrangement for controlling or regulating operations carried out by a printing machine
US6119594A (en) * 1993-06-25 2000-09-19 Heidelberger Druckmaschinen Aktiengesellschaft Method for regulating inking during printing operations of a printing press
EP0795400A1 (fr) * 1996-03-12 1997-09-17 Goss Graphic Systems, Inc. Dispositif pour aligner automatiquement une image d'une copie de production avec une image d'une copie de référence dans un système de contrÔle d'une machine d'impression
EP0914945A3 (fr) * 1997-11-06 1999-11-03 Heidelberger Druckmaschinen Aktiengesellschaft Procédé pour régler l'encrage dans une machine d'impression
DE102007029211A1 (de) * 2007-06-25 2009-01-08 Heidelberger Druckmaschinen Ag Verbesserter Druckkontrollstreifen zur Farbmessung auf Bedruckstoffen
US8807033B2 (en) 2007-06-25 2014-08-19 Heidelberger Druckmachinen Ag Print control strip for color measurement on printing material, measuring method and method of metering ink
CN104869282A (zh) * 2014-02-21 2015-08-26 海德堡印刷机械股份公司 色谱方面的特性化数据的换算
EP2910375A1 (fr) * 2014-02-21 2015-08-26 Heidelberger Druckmaschinen AG Conversion de données de caractérisation spectrales
US9471858B2 (en) 2014-02-21 2016-10-18 Heidelberger Druckmaschinen Ag Method for converting spectral characterization data
CN104869282B (zh) * 2014-02-21 2019-02-05 海德堡印刷机械股份公司 色谱方面的特性化数据的换算

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EP0649743B1 (fr) 1997-04-09
ATE151349T1 (de) 1997-04-15

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