EP0659559B1 - Méthode pour contrÔler l'apport d'encre dans une machine d'impression - Google Patents

Méthode pour contrÔler l'apport d'encre dans une machine d'impression Download PDF

Info

Publication number
EP0659559B1
EP0659559B1 EP94119152A EP94119152A EP0659559B1 EP 0659559 B1 EP0659559 B1 EP 0659559B1 EP 94119152 A EP94119152 A EP 94119152A EP 94119152 A EP94119152 A EP 94119152A EP 0659559 B1 EP0659559 B1 EP 0659559B1
Authority
EP
European Patent Office
Prior art keywords
printing
printed
ink density
ink
color
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
EP94119152A
Other languages
German (de)
English (en)
Other versions
EP0659559A2 (fr
EP0659559A3 (fr
Inventor
Thomas Fuchs
Johannes Slotta
Dieter Wagner
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
Original Assignee
MAN Roland Druckmaschinen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0659559A2 publication Critical patent/EP0659559A2/fr
Publication of EP0659559A3 publication Critical patent/EP0659559A3/fr
Application granted granted Critical
Publication of EP0659559B1 publication Critical patent/EP0659559B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 controlling the color guidance in a printing press according to the preamble of claim 1.
  • the visual color impression of offset printing products is created in known way through an interaction of subtractive and additive color mixing.
  • the individual grid points of the different Printing inks come in different sizes both side by side as well as overlapping one another more or less printed.
  • the printing inks used are glazed, i.e. the effect corresponds to that on the white substrate lying filter.
  • the color direction of the overprint of the Halftone dots are determined both by the layer thickness of the applied Printing ink as well as by the size of the halftone dots (geometric area coverage) determined.
  • EP 0 143 744 A1 describes a method for assessing the Known print quality and to regulate the color guide.
  • On Image elements in the subject are made with one or more measuring heads Remissions measured in four spectral ranges. For the three The spectral ranges are selected in such a way that chromatic colors the usual color density values result.
  • For the printing ink The spectral reflectance in the infrared range is determined in black. Using the Neugebauer equations, these become Remissions or color density values the corresponding area coverings determined (unmasked). This will be in the same picture areas copies printed on the machine as well as on one Debit template performed. From a target-actual comparison of the area coverings are then commands for the color control of the Printing machine derived.
  • DE 4 311 132 A1 describes a method for color regulation / control known in a printing press, which is characterized by that the density spectra of test prints of the individual at the combined printing involved printing inks with specified area coverage as well of paper white are recorded and stored that the density spectra a measuring point of the template and a measuring point of the Printed copies are recorded that these measured density spectra the template and the printed copy each as a linear combination the density spectra of the individual printing inks weighted by factors as well as the paper white, with the aim of Density spectra of the compression of the measuring point from the template and The best possible print copy through this linear combination to represent.
  • the color supply depends on the difference of the individual interpreted as area coverage Factors of the respective linear combination (template / printed copy) changed.
  • a disadvantage of this known method is that the Factors in the approach of the linear combination to represent the entire density spectrum (compression) from the density spectra of the Individual colors can be applied as area coverage.
  • Such one The approach with regard to the factors is taken at high areas of coverage a color in the image area problematic and completely fails when printing one or more colors in the Full tone. The reason is, in an easily recognizable way, that if, for example, a color of the template as a solid area the corresponding color in the printed copy is also printed only be printed as a full tone and not beyond that can. A regulation of colors in the area of full tone is therefore not possible.
  • the object of the present invention is therefore a method to expand in accordance with the preamble of claim 1 so that a control of the color guide with extended application possibilities is possible with great accuracy.
  • the remission values and these in known Can be converted into color density values by logarithmization. So it will be at the image points of the template and printed copy Color density spectra determined.
  • the color density spectrum of an image spot the template provides the so-called target color density spectrum represents and the spectrum of an image spot in the print copy the actual color density spectrum.
  • each image point is then in the form of a linear combination by those color density spectra of the printing inks, which on Compression of the image point involved are shown.
  • the Proportionality factors of this linear combination i.e. the Factors with which the corresponding color density spectra of the Individual colors to be multiplied then result in a direct and reliable measure of how much the color of each Printing ink is to be changed.
  • the color density spectra of the individual colors on the printed copy will be thereby also printed on the printed copy or based on previously produced test prints of existing measuring fields determined.
  • this is known per se Way printed a print control strip next to the subject, which in a measuring field of each color metering zone for each printed color Contains full tones.
  • the print control strip extends especially parallel to the sheet edge of the start of printing.
  • the proportionality factors are therefore set to zero.
  • colors their share of the printing area is below a certain percentage (e.g. ⁇ 10%) the linear combination representation of the difference color density spectrum an image point are also disregarded.
  • This advance information the proportion of printing area of an ink certain image location can either be directly from the prepress (Film or electronic prepress) or from the offset printing plate be determined. It is also possible in principle, the share printing area of a certain printing ink by a colorimetric Analysis of the corresponding image point to determine.
  • the original with respect to which the image locations of the printed copies with regard to their color or spectral appearance can be adjusted, it can be an OK sheet, a proof or a proof.
  • the template with the same Printing inks and the same type of substrate was produced, which is particularly advantageous.
  • the reason is here in that ultimately the spectral differences, that is Difference color density spectrum, between original and printed copy be minimized and this is done by having the appropriate Proportionality factors in the representation as a linear combination are to be determined in such a way that when printing the printed copies used printing inks or their solid colors Color density spectra are amplified or weakened in such a way that the difference in the color density spectrum becomes minimal.
  • a preferred development of the method according to the invention provides before that a weighting of the color density spectra of the combined printing printing inks involved in an image position according to their proportion Area is made. For example, it can be provided be that, for example, if cyan only with 5 to 10% area coverage is represented in the linear combination representation of the Difference color density spectrum the color density spectrum of the color cyan (as it is used when printing the printed copies) perfectly remains unconsidered. Within such a small percentage printing area is therefore zero-weighted for the corresponding area Color density spectrum.
  • the degree of area coverage can then be adjusted accordingly those involved in the printing together of an image section of the original Inks in the lower, middle and upper tonal range certain weighting factors can be assigned.
  • the corresponding The assignment of the weighting factors is empirically based on pressure tests certainly.
  • To determine the area coverage can also here again the electronic prepress, the film, the printing plate or a visual or video analysis of the corresponding Serve images.
  • Black is a particularly advantageous and simple way to determine the area coverage possible.
  • the infrared color density is in an area of the infrared certainly.
  • an empirical context can be used then from the measured infrared color density to the area coverage the printing ink black. In particular is thereby it can be determined whether this image passage is printed together the printing ink black is involved.
  • the method according to the invention is particularly advantageous then, especially if the image locations of the originals are not only in the spectral range of visible light but beyond can still be measured in a range of infrared and from which Measured value in infrared the infrared color density is determined. How was explained above, is then at each image point determines the difference color density spectrum. By knowledge the infrared color density can now this difference color density spectrum according to an empirically determinable relationship to influence the printing ink black can be reduced. You get one Difference color density spectrum of the image area, which by the Only the colored colors were created together. The representation of the reduced difference color density spectrum (without black component) is then also in the form of a linear combination through the color density spectra of the manufacturing of the printing inks involved.
  • a certain number of image areas for example, one or more in each color metering zone.
  • the image points are particularly special important parts of the subject. The selection of those to be considered Images are advantageously made on the printed sheet the template.
  • a so-called X-Y coordinate measuring table which is a in Spectrophotometer movable over the entire level of the printing sheet having.
  • a spectrophotometer can then automatically via appropriate positioning drives at the intended positions of the selected image points.
  • the positions of the selected image areas can be saved and then automatically approachable through program sequence. After each start one
  • the spectral reflectance is then determined in the image area and the conversion into the color density spectrum in a downstream computer. Saving the position of the selected one Images are made in a one-time run Spin.
  • the intended image areas were used for the arch as a template selected and their positions with the above described measuring device stored.
  • the process route a single place in the picture as well as in the sheet of the Print copy described.
  • R-Soll i; Bunt
  • i 1, ...., 35.
  • R-target determines which, for example, spectrally around each 10 nm apart should be selected (350 - 700 nm).
  • D (i; C) mean D (i; M), D (i; Y) and D (i; K) indicate the respective color density spectra Full-tone measuring fields of the sheet of the printed copy.
  • the index C stands for the printing ink cyan, the index M for the magenta ink, the Y index for the yellow ink and the index K for the printing ink black.
  • you can other colors (house or special colors) are also taken into account.
  • this is done in exactly that color metering zone, in which the measured image point lies, the corresponding ones Measuring fields of the full tones also spectrally measured and these remissions obtained in this way in the corresponding color density spectra the individual colors converted (D (i; C), D (i; M), D (i; Y), D (i; K).
  • weighting factors ⁇ , ⁇ , ⁇ , ⁇ are chosen as weighting factors such that the corresponding values lie between 0 and 1 and furthermore one all the more have larger amount, the higher the area coverage of the The printing ink involved is printed together.
  • Vividly means, for example, a positive and amount-based great value of a that the ink supply for the printing ink cyan must be increased significantly in the corresponding printing unit.
  • Corresponding clearly means a small and negative amount Value for a that the color metering in the corresponding color metering zone for the cyan ink must be reduced somewhat.
  • the interpretation when deriving control commands for the color dosage applies to the magenta, yellow and black inks the same for the factors b, c, d.
  • Printing inks cyan, magenta, yellow, black but involved for example, only the printing inks cyan and magenta, see above are presented according to the linear approach given above of the difference color density spectrum Delta-D (i; Bunt) die Weighting factors ⁇ , ⁇ , ⁇ and ⁇ are each set to zero. This can also be provided if it turns out that these colors mentioned here as examples only with one very small proportion of printing area are represented.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Ink Jet (AREA)

Claims (5)

  1. Procédé pour la commande de l'amenée d'encre dans une machine d'impression, notamment dans une machine d'impression offset, dans lequel on détermine les spectres de densité de couleur d'au moins un élément d'image dans un original et dans un exemplaire imprimé et on détermine des instructions de réglage pour les organes d'amenée d'encre de la machine d'impression en tenant compte des spectres de densité des encres intervenant dans l'impression conjointe de l'élément d'image de manière à obtenir la plus grande coincidence possible des spectres de densité de couleur des éléments d'image de l'original et de l'exemplaire imprimé,
       caractérisé en ce que
    on détermine à partir des spectres de densité de couleur des éléments d'image de l'original et de l'exemplaire imprimé le spectre de densité différentiel, on représente le spectre de densité différentiel sous la forme d'une combinaison linéaire des spectres de densité des différentes encres intervenant dans l'impression conjointe et on détermine les instructions de réglage pour les organes d'amenée d'encre de la machine d'impression à partir des facteurs de proportionnalité de cette combinaison linéaire.
  2. Procédé selon la revendication 1,
       caractérisé en ce que
    on effectue une pondération des spectres de densité des différentes encres intervenant dans l'impression conjointe des éléments d'image en fonction de leur part de surface imprimante.
  3. Procédé selon la revendication 1 ou 2,
       caractérisé en ce que
    l'on détermine la part de surface imprimante pour l'encre noire en déterminant la densité dans l'infrarouge D(IR).
  4. Procédé selon l'une des revendications 1 à 3,
       caractérisé en ce que
    les encres d'imprimerie ayant une petite part de surface imprimante restent non prises en compte lors de la représentation du spectre de densité différentiel.
  5. Procédé selon l'une des revendications 1 à 4,
       caractérisé en ce que
    l'on détermine les spectres de densité des différentes encres intervenant dans l'impression conjointe des éléments d'image sur des champs de mesure de teinte homogène imprimés en même temps que l'exemplaire imprimé.
EP94119152A 1993-12-22 1994-12-05 Méthode pour contrÔler l'apport d'encre dans une machine d'impression Expired - Lifetime EP0659559B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4343905A DE4343905C2 (de) 1993-12-22 1993-12-22 Verfahren zur Steuerung der Farbführung bei einer Druckmaschine
DE4343905 1993-12-22

Publications (3)

Publication Number Publication Date
EP0659559A2 EP0659559A2 (fr) 1995-06-28
EP0659559A3 EP0659559A3 (fr) 1996-12-18
EP0659559B1 true EP0659559B1 (fr) 1999-02-10

Family

ID=6505821

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94119152A Expired - Lifetime EP0659559B1 (fr) 1993-12-22 1994-12-05 Méthode pour contrÔler l'apport d'encre dans une machine d'impression

Country Status (5)

Country Link
US (1) US5551342A (fr)
EP (1) EP0659559B1 (fr)
JP (1) JP2872059B2 (fr)
AT (1) ATE176628T1 (fr)
DE (2) DE4343905C2 (fr)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19617016A1 (de) * 1996-04-27 1997-11-27 Thomas Fuchs Verfahren zur Steuerung der Farbgebung einer Druckmaschine
DE19632969C2 (de) * 1996-08-16 1999-04-29 Roland Man Druckmasch Verfahren zur Ermittlung von Vorgabewerten für die Herstellung von mehrfarbigen Druckexemplaren auf einer Druckmaschine
DE19703129B4 (de) * 1997-01-29 2014-08-21 Heidelberger Druckmaschinen Ag Verfahren zur Bewertung der Qualität eines im Mehrfarbendruck auf einem Bedruckstoff erzeugten Druckbildes
DE59708489D1 (de) * 1997-02-19 2002-11-21 Baldwin Germany Gmbh Vorrichtung und Verfahren zur Durchführung von qualitätsmanagement
US6024018A (en) * 1997-04-03 2000-02-15 Intex Israel Technologies Corp., Ltd On press color control system
DE19749064A1 (de) * 1997-11-06 1999-05-12 Heidelberger Druckmasch Ag Verfahren zur Ermittlung von Farbwertgradienten
DE19749066A1 (de) * 1997-11-06 1999-05-12 Heidelberger Druckmasch Ag Verfahren zur Regelung des Farbauftrages bei einer Druckmaschine
DE19749063A1 (de) * 1997-11-06 1999-05-12 Heidelberger Druckmasch Ag Verfahren zur Gewinnung von Farbmeßwerten
DE50016054D1 (de) 1999-02-26 2011-02-17 Koenig & Bauer Ag Verfahren zur Steuerung der Farbgebung einer Druckmaschine
US6564714B2 (en) * 2000-12-06 2003-05-20 Delaware Capital Formation, Inc. Spectral color control method
PL200158B1 (pl) * 2000-12-06 2008-12-31 Avt Advanced Vision Technology Sposób sterowania kolorem na arkuszu drukarskim
DE10142322C2 (de) * 2001-08-30 2003-08-21 Oce Printing Systems Gmbh Verfahren zur Anpassung der von einem zweiten Drucksystem gedruckten Farben an die von einem ersten Drucksystem gedruckten Farben
DE10245702A1 (de) 2001-10-25 2003-05-08 Heidelberger Druckmasch Ag Anpassung der Farbsteuerung an die physikalischen Eigenschaften von Farbe und Bedruckstoff
JP2005246839A (ja) * 2004-03-05 2005-09-15 Mitsubishi Heavy Ind Ltd 印刷機における色調制御方法及び装置
US7450754B2 (en) 2004-03-23 2008-11-11 Microsoft Corporation Radiometric calibration from a single image
DE102005060893C5 (de) * 2005-12-20 2019-02-28 Manroland Goss Web Systems Gmbh Verfahren zur Ermittlung eines drucktechnischen Messwertes
US9373063B2 (en) * 2010-02-26 2016-06-21 Onyx Graphics, Inc. Establishing ink usage of process channels
US8928781B2 (en) 2011-11-30 2015-01-06 Microsoft Corporation Response function determination by rank minimization

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE143744C (fr) *
EP0143744B1 (fr) * 1983-11-04 1988-01-13 GRETAG Aktiengesellschaft Procédé et dispositif d'analyse de qualité d'impression et/ou de réglage d'encre dans une rotative offset et rotative offset équipée d'un tel dispositif
DE3666554D1 (en) * 1985-12-10 1989-11-30 Heidelberger Druckmasch Ag Process for controlling the application of colours in a printing machine, printing device equipped therewith and measuring device for such a printing device
JPH02110566A (ja) * 1988-10-20 1990-04-23 Fuji Photo Film Co Ltd 印刷管理用測光測色器
DE3903981C2 (de) * 1989-02-10 1998-04-09 Heidelberger Druckmasch Ag Verfahren zur Regelung der Farbfüllung bei einer Druckmaschine
US5224421A (en) * 1992-04-28 1993-07-06 Heidelberg Harris, Inc. Method for color adjustment and control in a printing press

Also Published As

Publication number Publication date
EP0659559A2 (fr) 1995-06-28
US5551342A (en) 1996-09-03
DE4343905A1 (de) 1995-06-29
DE59407805D1 (de) 1999-03-25
DE4343905C2 (de) 1996-02-15
JP2872059B2 (ja) 1999-03-17
EP0659559A3 (fr) 1996-12-18
ATE176628T1 (de) 1999-02-15
JPH07205412A (ja) 1995-08-08

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