EP0659559B1 - Verfahren zur Steuerung der Farbführung bei einer Druckmaschine - Google Patents
Verfahren zur Steuerung der Farbführung bei einer Druckmaschine Download PDFInfo
- 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
Links
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)
Description
Claims (5)
- Verfahren zur Steuerung der Farbführung bei einer Druckmaschine, insbesondere Offsetdruckmaschine, bei welchem die Farbdichtespektren mindestens einer Bildstelle in Vorlage- und Druckexemplar erfaßt und eine Bestimmung von Stellbefehlen für die Farbführungsorgane der Druckmaschine unter Berücksichtigung der Farbdichtespektren der am Zusammendruck der Bildstelle beteiligten Farben dahingehend erfolgt, daß eine größtmögliche Übereinstimmung der Farbdichtespektren der Bildstellen von Vorlage- und Druckexemplar erzielt wird,
dadurch gekennzeichnet,
daß aus den Farbdichtespektren der Bildstellen aus Vorlage- und Druckexemplar das Differenz/-Farbdichtespektrum bestimmt wird, daß das Differenz-Farbdichtespektrum als eine Linearkombination der Farbdichtespektren der einzelnen, am Zusammendruck beteiligten Druckfarben dargestellt wird, und daß die Stellbefehle für die Farbführungsorgane der Druckmaschine aus den Proportionalitätsfaktoren dieser Linearkombination bestimmt werden. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß eine Wichtung der Farbdichtespektren der einzelnen am Zusammendruck der Bildstellen beteiligten Druckfarben entsprechend deren Anteil druckender Fläche erfolgt. - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die Ermittlung des Anteils druckender Fläche für die Druckfarbe Schwarz durch eine Bestimmung der Infrarot-Farbdichte D(IR) erfolgt. - Verfahren nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß Druckfarben mit einem geringen Anteil druckender Fläche bei der Darstellung des Differenz-Farbdichtespektrums unberücksichtigt bleiben. - Verfahren nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß die Erfassung der Farbdichtespektren der einzelnen am Zusammendruck der Bildstellen beteiligten Druckfarben an auf dem Druckexemplar mitgedruckten Meßfeldern des Volltons erfolgt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4343905 | 1993-12-22 | ||
DE4343905A DE4343905C2 (de) | 1993-12-22 | 1993-12-22 | Verfahren zur Steuerung der Farbführung bei einer Druckmaschine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0659559A2 EP0659559A2 (de) | 1995-06-28 |
EP0659559A3 EP0659559A3 (de) | 1996-12-18 |
EP0659559B1 true EP0659559B1 (de) | 1999-02-10 |
Family
ID=6505821
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94119152A Expired - Lifetime EP0659559B1 (de) | 1993-12-22 | 1994-12-05 | Verfahren zur Steuerung der Farbführung bei einer Druckmaschine |
Country Status (5)
Country | Link |
---|---|
US (1) | US5551342A (de) |
EP (1) | EP0659559B1 (de) |
JP (1) | JP2872059B2 (de) |
AT (1) | ATE176628T1 (de) |
DE (2) | DE4343905C2 (de) |
Families Citing this family (18)
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 |
EP0860276B1 (de) * | 1997-02-19 | 2002-10-16 | 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 |
DE19749063A1 (de) * | 1997-11-06 | 1999-05-12 | Heidelberger Druckmasch Ag | Verfahren zur Gewinnung von Farbmeßwerten |
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 |
ATE494144T1 (de) | 1999-02-26 | 2011-01-15 | Koenig & Bauer Ag | Verfahren zur steuerung der farbgebung einer druckmaschine |
PL200158B1 (pl) * | 2000-12-06 | 2008-12-31 | Avt Advanced Vision Technology | Sposób sterowania kolorem na arkuszu drukarskim |
US6564714B2 (en) * | 2000-12-06 | 2003-05-20 | Delaware Capital Formation, Inc. | Spectral color control method |
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE143744C (de) * | ||||
EP0143744B1 (de) * | 1983-11-04 | 1988-01-13 | GRETAG Aktiengesellschaft | Verfahren und Vorrichtung zur Beurteilung der Druckqualität und/oder Regelung der Farbführung bei einer Offset-Druckmaschine und mit einer entsprechenden Vorrichtung ausgestattete Offset-Druckmaschine |
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 |
-
1993
- 1993-12-22 DE DE4343905A patent/DE4343905C2/de not_active Expired - Fee Related
-
1994
- 1994-12-05 AT AT94119152T patent/ATE176628T1/de not_active IP Right Cessation
- 1994-12-05 DE DE59407805T patent/DE59407805D1/de not_active Expired - Fee Related
- 1994-12-05 EP EP94119152A patent/EP0659559B1/de not_active Expired - Lifetime
- 1994-12-22 US US08/361,596 patent/US5551342A/en not_active Expired - Lifetime
- 1994-12-22 JP JP6320678A patent/JP2872059B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE59407805D1 (de) | 1999-03-25 |
US5551342A (en) | 1996-09-03 |
DE4343905C2 (de) | 1996-02-15 |
JP2872059B2 (ja) | 1999-03-17 |
ATE176628T1 (de) | 1999-02-15 |
JPH07205412A (ja) | 1995-08-08 |
EP0659559A2 (de) | 1995-06-28 |
DE4343905A1 (de) | 1995-06-29 |
EP0659559A3 (de) | 1996-12-18 |
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