EP1388418B1 - Procédé d'impression - Google Patents

Procédé d'impression Download PDF

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Publication number
EP1388418B1
EP1388418B1 EP02016994A EP02016994A EP1388418B1 EP 1388418 B1 EP1388418 B1 EP 1388418B1 EP 02016994 A EP02016994 A EP 02016994A EP 02016994 A EP02016994 A EP 02016994A EP 1388418 B1 EP1388418 B1 EP 1388418B1
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EP
European Patent Office
Prior art keywords
print
printing
data
transmitted
colour
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
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EP02016994A
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German (de)
English (en)
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EP1388418A1 (fr
Inventor
Thomas Senn
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.)
X Rite Switzerland GmbH
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Gretag Macbeth AG
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Publication date
Application filed by Gretag Macbeth AG filed Critical Gretag Macbeth AG
Priority to EP02016994A priority Critical patent/EP1388418B1/fr
Priority to DE50203350T priority patent/DE50203350D1/de
Priority to US10/634,367 priority patent/US20040027595A1/en
Publication of EP1388418A1 publication Critical patent/EP1388418A1/fr
Application granted granted Critical
Publication of EP1388418B1 publication Critical patent/EP1388418B1/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

  • the invention relates to a printing method according to the preamble of the independent Claim 1. More specifically, the invention relates to quality control and production release at the contact pressure.
  • the typical workflow of a print job today is usually in two groups structured by process steps.
  • the first group generally runs in the reprographic institute and is referred to as a so-called prepress. Be here Various preparatory process steps carried out.
  • the second group of process steps takes place in the printing house, where the contact pressure takes place.
  • the prepress and the printing house are usually physically separated.
  • an original to be reproduced in the printing process becomes electronic Form generated.
  • an original template serve any image motifs; these are with an electronic camera or a film camera.
  • the original is in the form of original digital image data.
  • image data are typically RGB encoded, i. red for the three primary colors, green and blue each have their own (digital) intensity signal for each image pixel.
  • image data can also be standardized in a device-independent CIE-L * a * b * or CIE-X-Y-Z signal are converted. This image data will be by the reprographer usually still from different points of view means edited a suitable image processing software.
  • CMYK print data is used to calculate CMYK print data.
  • CMYK print data To become the paper and ink spectra and the color values derived from them or the CMYK print data is taken from conversion tables.
  • These Print data describe the area coverage of the printing grids for the standard inks Cyan (C), magenta (M), yellow (Y) and black (K) as a function of image data. But it can also cover areas for additional or other inks, e.g. Special colors for packaging printing, to be determined.
  • print data except Area coverage also means amount of color or color intensity.
  • the CMYK print data becomes In the pre-press, the screen films are also generated and proof plates produced and with their help in a special press, the so-called proof machine, some proofs, the so-called proofs produced. On hand of one Visual quality control of these proofs are issued by those responsible in the Prepress or even the client himself the "good to print".
  • the raster films are then transported together with the proof to the printing house, where from the raster films the printing plates for the pad printing machine are produced and thus the contact pressure takes place.
  • CMYK proof data are controlled by CMYK proof data.
  • CMYK proof data are preferably from the CMYK print data derived, whereby the specific pressure characteristics of the order used Printing machine and inks can be considered.
  • the proof printer shows the expected print result (e.g., by using ICC profiles, which emulates the printing process on the proof printer). This Proof is visually evaluated and serves as the basis for the "Good to Print”.
  • the expected print image can also be applied judge a screen ("soft proof").
  • the CMYK print data in Screen data is converted and displayed on a screen.
  • the paper and ink spectra or color values, or the screen data are conversion tables that meet the job-specific printing conditions correspond, taken.
  • the visual quality control then takes place on the screen.
  • the comparison can also be made directly with the original template. The "Good to Print "is then given based on this screen.
  • the CMYK print data are transmitted via electronic communication channels directly to the printer or the same order even to several Transfer printers. This can be done globally and over long distances. In the Printer will then receive the print data and used to produce the raster films and with the help of which the printing plates are exposed, or the printing plate exposure is preferably controlled directly with the CMYK print data.
  • the printing plates are developed and then transferred to the printing press clamped, and the contact pressure is started.
  • the first prints are visually with compared to the proof supplied by the prepress and the acceptance of the "Good to pad pressure" granted. This release is made by the persons responsible in the print shop, unless it is at this time a person in charge of prepress or the client himself present in the printing house.
  • Modern printing machines are usually equipped with a color measurement system.
  • So-called “online color measurement systems” are integrated into the printing press and enable it Color measurement on the moving web of sheetfed and web presses.
  • “Offline color measurement systems” come primarily with sheetfed presses for use. In these color measuring systems, the printed Test sheet for measuring data and image recording by the user on the measuring system hung up.
  • Measuring systems are already being used that are not just selected measuring positions test, but the entire sheet in a variety evenly distributed Divide measuring elements and measure them all spectrally (e.g., US 6,012,390). These Technique also allows a pictorial representation of the spectral image measurement data on a screen. It can also special, equipped for the colorimetric measurement electronic cameras (e.g., EP-A 1 213 568 and EP-A 1 213 569). These sequentially photograph the printed sheets divided into partial images. In contrast to R-G-B cameras used for image capture, the local image resolution of these color measurement systems, however, be lower. In addition to the However, spectrally measuring image acquisition can also be systems with only three spectral Areas are used. The color values obtained are then however restricted in absolute accuracy.
  • a process for color control and color control of digital color printing devices is also known from DE-A-100 23 270.
  • Specially selected image positions can be defined as measuring elements and be provided with colorimetric setpoints. This can already be done in prepress and these setpoints as well as the measurement positions may also be the CMYK image data for common data transfer. The setpoints will be then compared with the measured actual values and with too large color deviations is automatically acted on the color control of the press.
  • the person operating the printing machine can also manually adjust the color (Color concentration or ink layer thickness) of the printing press act and the best compromise for the color reproduction of all image motifs.
  • the intended color correction true to color on the screen can be represented. So this intended color correction in the color measurement system can be accurately predicted by means of a printing process model the preferably spectral data of the involved printing inks must be known.
  • each process stage is present to understand the bearing pressure at one of the bearing pressure Printing place is done separately. Prepress closes here also the client or the possibly occurring in this process stages with a.
  • a particularly advantageous aspect of the invention can analogously to the activity of the printing expert in the print shop of the responsible for the quality in the Pre-press by setting color target values, ink layer thicknesses, color concentrations and desired spectra or formulations of the inks involved in the printing and sending this data to the printer manually on the color scheme of the Press, so the best compromise for the color reproduction to reach all picture motives.
  • a visual comparison with a reference image is possible.
  • a reference picture can the original original or a quality proof or proof used become.
  • the process will be a screen image as a reference image either the original original or a quality proof or proof used.
  • This pictorial representation is preferably by means of an image scanning end Color measuring system produced, preferably a similar or same color measuring system as used in the printing, to ensure optimal To achieve agreement between the reference and test data.
  • an original 1 to be reproduced is used by means of a digitalization device 2 generates digital original image data 3.
  • the Concrete training of digitizing device 2 depends on the type of original template and may be e.g. a color scanner or an electronic camera. If the original template is already in the form of digital image data, the falls Digitization step of course gone.
  • the digital original image data 3 are processed by an image editing program 4 processed in mannigfacher manner until the desired color impression is achieved. at On this occasion, selected measuring positions and setpoint values 5 in These measurement positions are set, which later in the printing of the Color control are used.
  • the processed image data digital CMYK print data. 6 (Raster color separations) for the printing inks involved in the printing as a function of the image data calculated.
  • the calculation of the pressure data takes place in a manner known per se taking into account the paper and ink spectra 7, which are used for this purpose in the Prepress are available.
  • sample print data are also known manner 8 calculated and fed to a sample printer 9, which from one Proof (proof) 10 generated, which reflects the expected contact pressure result.
  • the calculation of the trial print data 8 from the CMYK print data 6 takes place such that the specific printing properties of the order in the Printing press and printing inks used. Of the Sample 10 is visually evaluated and serves as the basis for the "Goodées Print”.
  • CMYK print data 6 can also be used for raster films and generated from these proof plates 11 for a special proofing machine 12 and with this pressure machine then some proofs 13 are created, the be judged visually and analogous to the proof 10 as a basis for the "Good to the pressure "serve.
  • Another, particularly useful variant for the first assessment of the expected Print result consists in creating a virtual test print a screen.
  • the CMYK print data 6 in a conventional manner in a screen data generator 14 taking into account the paper and ink spectra 7 converted into corresponding screen data and then on a screen as so-called "soft proof” 15 shown.
  • This soft proof 15 can then on the one hand serve as a basis for the "good to pressure” and on the other hand, how will be explained in more detail below, as a reference image for the inventive Quality assessment of the contact pressure are used.
  • the CMYK print data 6 and the measurement positions and Color setpoint 5 is transmitted via a data channel 16a-16b to the printer.
  • the Printers (Fig. 2) become known per se from the received CMYK print data 6 Way created the printing plates 17 for the printing press 18 used and then printed some pad print copies.
  • the printing press 18 is equipped with an on-line or off-line color measuring system 19 fitted, by means of which the entire sheet scanned imagewise and can be measured.
  • a suitable color measuring system is, for example, in US-A-6,012,390.
  • the color measurement system 19 is spectrally designed and generates a number of remission values for each pixel measured at different wavelengths. Typically, 16 wavelength ranges with mutual center distances of 20nm over a total spectral range measured from 400 nm to 700 nm.
  • the entirety of the color measuring system 19 generated data for a fully measured sheet is called test image data 20 denotes.
  • the test image data can also be measured from several Padded copies originate.
  • the test image data 20 are generated by means of a screen data generator 21 converted into corresponding screen data and as Test image 22 displayed on a screen.
  • the test image 22, so with the color measurement system 19 captured screen representation of a pad print copy can used for visual quality assessment.
  • test image data 20 also contain the current color measurement values 23 the measurement positions specified in prepress. These current color readings 23 are compared with the color target values 5 transmitted by the prepress and from the color deviations 24 formed.
  • the color deviations 24 in The individual measuring positions are the color control system 25 of the printing press Fed 18 and evaluated by this for the automatic control of the color.
  • the screen data generator 21 also contains a model of the printing process, ie the printing properties of the printing machine 18 in conjunction with the used Printing inks and paper qualities. This allows the printing expert to see the effects Manual corrections 26 in the test image 22, before their implementation in the Printing machine to visualize true to color.
  • the test image data 20 received in the prepress can now be used in prepress be evaluated in the same way for quality monitoring as traditionally in the printing house.
  • the test image data 20 is supplied to a screen data generator 31, which same as the screen data generator 21 in the printing the test image data 20 converted into a test image 32 and displayed on a screen.
  • This test image 32 so the screen representation of a measured in the printing pad edition copy 29, is in the prepress by the quality manager subjected to a visual comparison 33 with a quality-binding reference image 15, whereby this visual comparison serves as the basis for the "good to the pad pressure" 34 serves. If the comparison result is satisfactory then the release for transmitted the pad pressure via a data channel 35a-35b to the printer and there the productive contact pressure on or further driven.
  • data channels 16a-16b, 30a-30b and 35a-35b in practice can also be realized by a single data channel.
  • the current color readings 23 contained in the test image data 20 in the specified Measurement positions are compared with the corresponding color setpoints 5 and thereby the color deviations 24 formed. These can be used as a basis be evaluated for the "good to pad pressure" 34 and on the other hand also to the current Logging 36 uses the quality of the pad print in prepress become.
  • a reference image can be in the prepress either the original template 1 itself or a quality proof proof 10 or proof 13 are used.
  • the reference image is the virtual test print ("Soft proof") 15 used. It is understood that the reference picture and the Must not necessarily be displayed on two separate screens, but also displayed simultaneously or alternately on a single monitor can be.
  • the screen data generator 31 comprises analogous to the screen data generator 21 in the printing house a model of the pad printing process, so that analogous to the activity the printing expert in the printing house even in the pre-press manual Corrections 37 made the coloring (color layer thicknesses, color concentration) and their effects in print reproduced in full color on the screen can be.
  • the corrections may also be simultaneous with the uncorrected one Test image on the screen by displaying the image e.g. checkered is split and in the odd fields the unchanged image information and in the even fields, the corrected image information for display is brought.
  • the transmission of the test image data 20 can be effective during the whole contact printing remain, and the quality data (e.g., color deviations 24) may be kept in registered a pad printing protocol 36.
  • CMYK test proof data can be calculated, which are printed with the already mentioned sample printer 9. This expression can then with the previously printed proof 10, from the CMYK print data 6 was compared visually.
  • the prepress stage can also be provided with a (preferably spectral) Color measuring system 39 be equipped.
  • a (preferably spectral) Color measuring system 39 be equipped.
  • image data 40 result are displayed in the screen data generator 14 converted into appropriate screen data and then on the screen as a reference image 15 and for visual comparison with the recorded in the printing Test image 32 used.
  • the advantage of measuring the original template 1 with a color measuring system with respect to the detection with a reprographic camera (digitizing 2) lies in the exact colorimetric image acquisition.
  • the color measuring systems 19 and 39 in the printing or prepress are preferably the same Design, whereby optimal agreement between the test image data and the reference image data is guaranteed.
  • test print 10 or 10 generated by the trial printer 9 can the pressure generated with the pressure machine 12 13 as quality reference between agreed to the client and the prepress department.
  • This test or proof can now be detected with the color measurement system 39 and its data as well with the test image data of a copy, which can be reproduced with the color measuring system 19 recorded in the print shop.
  • the color measuring systems 19 and 39 in the printing and prepress can preferably also be equipped with a goniometric measuring geometry, the one Lighting not only, as usual, at 45 ° to the shooting direction, but under Several, different directions allowed, this can contribute to the visual impression different perspectives are modeled and above all the gloss of different Image surfaces are evaluated.
  • a virtual Proof (soft proof) 42 calculated and displayed on a screen become.
  • This virtual trial print 42 can then be used for visual comparison with the there recorded test image 22 or used directly with a pad print copy 29 and form the basis for the release of the pad pressure.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Printing Methods (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (18)

  1. Procédé d'impression, dans lequel, dans une étape d'impression préliminaire,
    des données numériques d'image de maquette (3) sont fournies qui représentent une maquette originale (1),
    à partir des données d'image de maquette (3), des données numériques d'impression (6) sont générées pour les couleurs d'impression impliquées dans l'impression, et
    les données numériques d'impression (6) sont transmises à une imprimerie par l'intermédiaire d'un canal de données (16a à 16b),
       et dans lequel, en outre, à l'imprimerie,
    des planches d'impression (17) sont créées à l'aide des données numériques d'impression (6),
    et dans une machine à imprimer (18), le tirage est effectué à l'aide de ces planches d'impression (17),
    dans lequel, à l'aide d'une mesure colorimétrique par image d'un ou de plusieurs exemplaires de tirage (29), des données d'image de contrôle (20) représentant une image de contrôle (22) sont générées au moyen d'un système colorimétrique (19),
    et utilisées pour le réglage de couleur de la machine à imprimer (18),
       caractérisé en ce que
    les données d'image de contrôle (20) générées à l'imprimerie sont transmises à l'étape préliminaire d'impression par l'intermédiaire d'un canal de données (30a à 30b),
    à l'étape préliminaire d'impression, les données d'image de contrôle (20) sont évaluées pour un contrôle de qualité,
    le résultat du contrôle de qualité est transmis à l'imprimerie par l'intermédiaire d'un canal de données (16a à 16b ; 35a à 35b),
    et à l'imprimerie, le résultat du contrôle de qualité transmis par l'étape préliminaire d'impression est utilisé pour le bon à tirer ou pour influencer l'opération d'impression.
  2. Procédé selon la revendication 1, caractérisé en ce qu'à l'étape préliminaire d'impression, des positions de mesure et des valeurs de consigne de couleur (5) dans ces positions de mesure sont définies et transmises à l'imprimerie par l'intermédiaire du canal de données (16a à 16b), et en ce qu'à l'imprimerie, les valeurs de consigne de couleur (5) sont utilisées pour le réglage de couleur de la machine à imprimer (18).
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que pour la mesure colorimétrique par image d'un ou de plusieurs exemplaires de tirage (29), un système colorimétrique à fonctionnement spectral (19) est utilisé, et en ce que les données d'image de contrôle (20) transmises à l'étape préliminaire d'impression sont des données spectrales, qui comprennent pour chaque point d'image mesuré des valeurs de réflectance pour plusieurs longueurs d'onde différentes, en particulier 16 longueurs d'onde dans la plage de 400 à 700 nm avec respectivement un intervalle de 20 nm.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'à l'aide des données d'image de contrôle (20) transmises à l'étape préliminaire d'impression, une image de contrôle (32) est calculée et représentée visuellement sur un écran, et en ce que le contrôle de qualité comprend une comparaison visuelle de l'image de contrôle représentée (32) avec une image de référence (15).
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que le contrôle de qualité comprend un contrôle des écarts de couleur (24) entre les valeurs de consigne de couleur (5) et les valeurs mesurées de couleur (23) correspondantes contenues dans les données d'image de contrôle (20).
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que des données numériques d'impression de contrôle sont générées à partir des données d'image de contrôle (20) transmises à l'étape préliminaire d'impression, en ce qu'à l'aide de ces données numériques d'impression de contrôle, une impression de contrôle physique est générée, et en ce que le contrôle de qualité comprend une comparaison visuelle de cette impression de contrôle avec une image de référence (15), en particulier avec une impression d'essai (10) ou épreuve (13) créée à l'étape d'impression préliminaire à l'aide des données numériques d'impression (6).
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que comme résultat du contrôle de qualité à l'étape préliminaire d'impression, on transmet le bon à tirer (34) à l'imprimerie.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que comme résultat du contrôle de qualité à l'étape préliminaire d'impression, en raison d'une modification de couleur souhaitée, on transmet à l'imprimerie des valeurs de consigne de couleur (5) nouvelles ou modifiées.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que comme résultat du contrôle de qualité à l'étape préliminaire d'impression, en raison d'une modification de couleur souhaitée, on transmet à l'imprimerie des valeurs d'épaisseur de couche ou des valeurs de concentration nouvelles ou modifiées pour les couleurs d'impression impliquées dans l'impression.
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce que comme résultat du contrôle de qualité à l'étape préliminaire d'impression, en raison d'une modification de couleur souhaitée, on transmet à l'imprimerie des spectres de consigne (7) ou des formulations nouveaux ou modifiés pour les couleurs d'impression impliquées dans l'impression, en particulier des couleurs spéciales.
  11. Procédé selon l'une des revendications précédentes, caractérisé en ce que comme résultat du contrôle de qualité à l'étape préliminaire d'impression, en raison d'une modification de couleur souhaitée, des données numériques d'impression (6) nouvelles ou modifiées sont générées et transmises à l'imprimerie, et en ce qu'à l'imprimerie, de nouvelles planches d'impression (17) sont créées en raison de ces données numériques d'impression (6) et utilisées pour le tirage.
  12. Procédé selon l'une des revendications précédentes, caractérisé en ce que le contrôle de qualité à l'étape préliminaire d'impression comprend l'établissement d'une consigne (36) de la qualité d'impression du tirage.
  13. Procédé selon l'une des revendications précédentes, caractérisé en ce que comme image de référence pour la comparaison visuelle avec l'image de contrôle (32), on utilise la maquette originale (1) ou une représentation à l'écran (15) de celle-ci.
  14. Procédé selon l'une des revendications précédentes, caractérisé en ce que comme image de référence pour la comparaison visuelle avec l'image de contrôle (32), on utilise une impression d'essai (10) ou épreuve (13), ou une représentation à l'écran (15) de celle-ci, imprimée à l'aide des données numériques d'impression (6) et obligatoire pour la qualité.
  15. Procédé selon l'une des revendications précédentes, caractérisé en ce que comme image de référence pour la comparaison visuelle avec l'image de contrôle (32), on utilise une représentation à l'écran d'une impression d'essai virtuelle (15), calculée à partir des données numériques d'impression (6) et obligatoire pour la qualité.
  16. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'à l'imprimerie, à partir des données numériques d'impression (6) transmises par l'étape préliminaire d'impression, une impression d'essai virtuelle (42) est calculée et représentée sur un écran, et en ce que cette impression d'essai virtuelle (42) est utilisée pour la comparaison visuelle avec l'image de contrôle (22) saisie à l'imprimerie ou directement avec un exemplaire du tirage (29).
  17. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'à l'étape préliminaire d'impression, la maquette originale (1) ou une impression d'essai (10) obligatoire pour la qualité est mesurée par image au moyen d'un système colorimétrique (39), de préférence spectral, et une représentation à l'écran (15) de la maquette originale ou de l'impression d'essai est générée à partir des données d'image (40) alors obtenues, et en ce que cette représentation à l'écran (15) est utilisée comme une image de référence pour la comparaison avec l'image de contrôle (32).
  18. Procédé selon la revendication 16, caractérisé en ce que le système colorimétrique (19) à l'imprimerie et le système colorimétrique (39) à l'étape préliminaire d'impression est muni d'une géométrie de mesure goniométrique qui permet pour la prise de vue des éclairages dans différents sens.
EP02016994A 2002-08-05 2002-08-05 Procédé d'impression Expired - Lifetime EP1388418B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP02016994A EP1388418B1 (fr) 2002-08-05 2002-08-05 Procédé d'impression
DE50203350T DE50203350D1 (de) 2002-08-05 2002-08-05 Druckverfahren
US10/634,367 US20040027595A1 (en) 2002-08-05 2003-08-05 Printing process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02016994A EP1388418B1 (fr) 2002-08-05 2002-08-05 Procédé d'impression

Publications (2)

Publication Number Publication Date
EP1388418A1 EP1388418A1 (fr) 2004-02-11
EP1388418B1 true EP1388418B1 (fr) 2005-06-08

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EP02016994A Expired - Lifetime EP1388418B1 (fr) 2002-08-05 2002-08-05 Procédé d'impression

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US (1) US20040027595A1 (fr)
EP (1) EP1388418B1 (fr)
DE (1) DE50203350D1 (fr)

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JP2005310115A (ja) * 2004-03-25 2005-11-04 Fuji Photo Film Co Ltd 画像データ変換装置、画像データ変換プログラム、および画像出力システム
DE102004021601B4 (de) * 2004-05-03 2020-10-22 Heidelberger Druckmaschinen Ag Inline-Messung und Regelung bei Druckmaschinen
DE102004064309B3 (de) 2004-05-03 2022-02-10 Heidelberger Druckmaschinen Ag Inline-Messung und Regelung bei Druckmaschinen
DE102006033006A1 (de) 2006-07-17 2008-01-31 Man Roland Druckmaschinen Ag Verfahren und Vorrichtung zur Erzeugung einer farblichen Referenz für ein Druckbild
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