EP0759192A1 - Process control strip and a method of recording - Google Patents
Process control strip and a method of recordingInfo
- Publication number
- EP0759192A1 EP0759192A1 EP96903928A EP96903928A EP0759192A1 EP 0759192 A1 EP0759192 A1 EP 0759192A1 EP 96903928 A EP96903928 A EP 96903928A EP 96903928 A EP96903928 A EP 96903928A EP 0759192 A1 EP0759192 A1 EP 0759192A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- process control
- tonal
- value
- control strip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
- G03D13/00—Processing apparatus or accessories therefor, not covered by groups G11B3/00 - G11B11/00
- G03D13/007—Processing control, e.g. test strip, timing devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
Definitions
- the invention relates to the field of electronic reproduction technology and relates to a process control strip for the visual control and calibration of an exposure process for a recording material, in particular for a printing plate, and to a method for recording the process control strip.
- the dot-and-line, screened exposure of a recording material is usually carried out by means of an electronic recording device, also known as an imagesetter or recorder.
- image signal values which represent the tone values to be recorded, are fed to a raster generator in which the raster function converts the image signal values into control signal values for an exposure beam generated in an exposure unit of the imagesetter.
- the film is exposed pixel by line and line by line, in that the control signal values switch the exposure beam on and off and thus determine which pixels are exposed as parts of the grid points on the film or not exposed.
- the raster function determines the size of the raster points depending on the tonal values to be recorded.
- the real tonal values or halftone dot sizes produced on the film deviate from the desired nominal tonal values, since each pixel and thus each halftone dot is recorded more or less enlarged by overexposure.
- the deviations between the real tonal values and the nominal tonal values are called point increases, which lead to disturbing tonal value changes in the reproduction.
- the point increases are therefore compensated during the film exposure in the imagesetter by correcting the image signal values, which represent the nominal tonal values, according to a correction curve determined before the film exposure, by means of a so-called film linearization such that those on the film are real recorded tonal values correspond to the nominal tonal values.
- the film exposed in the imagesetter is developed in a development station and used to produce a printing form.
- the conventional production of printing plates takes place in two sub-processes.
- a film is exposed using an imagesetter and the exposed film is developed in a development station.
- the exposed and developed film is copied as a template in a copying device onto a photosensitive printing plate, whereby slight positive or negative dot increases and thus falsification of the tonal value can also occur.
- the exposed printing plate is then also developed in a development station.
- the conventional calibration of the first sub-process namely the point and line-wise film exposure in an imagesetter and the film development in a development station, is carried out, for example, with the aid of stepped standard gray wedges, which are exposed on the film and co-developed, and by measuring the solid density.
- Constant monitoring of the stability of exposure and development using the known means is too complicated in practice. For this reason, adherence to a stable work process has so far been carried out indirectly by checking and regulating or adjusting suitable process parameters such as the intensity of the exposure beam and / or the correction curve in the imagesetter and the development temperature and / or the regeneration rates in the development station.
- the conventional calibration of the second sub-process namely the imagewise exposure of the printing plate in a copying device and the development of the exposed printing plate in a development station, is often carried out using the microline method with the aid of precision measuring strips, for example with the FOGRA precision measuring strip PMS- I or the UGRA offset test wedge 1982.
- precision measuring strips are e.g. B. described in detail in "fogra practice report" No. 34, 1990, Fogra-PMS-I and UGRA offset test wedge 1982.
- FOGRA German Research Association for Printing and Reproduction Technology e.V.
- a test film is known from DE-A-23 56 325 which is copied in a copying device together with the original onto a printing plate in order to generate a control image on the printing plate for visual control of the subsequent development process.
- the test film shows fine signal elements in the form of finely structured Districts and coarse signal elements in the form of a coarsely structured background area which surrounds and separates the finely structured areas.
- the districts each consist of a large number of points.
- the finely structured areas are such that a change in the process conditions leads to a visible change in their optical density, while the optical density of the roughly structured background area changes only slightly when the process conditions change, as a result of which changes in the process conditions are visually indicated.
- Constant monitoring of the stability of the copying process and development of the printing plate is also too expensive in practice with the known means. For this reason, adherence to a stable working process has so far been carried out indirectly in the copying process by checking and regulating or setting suitable process parameters such as, for example, the exposure time or the number of cycles and the duration of the vacuum suction of the printing plate in the case of imagewise exposures in the copying device and the development temperature or the regeneration rates in the development station. Often, these process parameters are only checked at longer intervals, mostly in connection with new batches of material, for cost reasons.
- This object is achieved with respect to the process control strip by the features of claim 1 and with respect to the method by the features of claim 13.
- FIG. 1 shows a basic structure of a process control strip for the direct exposure of printing plates by means of an imagesetter
- Fig. 3 is a simulated as Contone pressure process control strip
- FIG. 4 shows a basic block diagram of a device for direct exposure of printing plates.
- FIG. 1 shows the basic structure of a process control strip (1) for the direct exposure of printing plates by means of an imagesetter (computer-to-plate).
- the process control strip (1) is exposed on the printing plate during the direct exposure of the printing plate in the imagesetter outside the printing plate area intended for the information to be exposed and developed together with the information in a development station.
- the exposed and developed process control strip (1) is used for visual control and adjustment of the process parameters such as the intensity of the exposure beam and the development temperature and / or the regeneration rates in the development station.
- the process control strip (1) basically consists of three strips which extend in the direction of the greater extent of the process control strip (1) and are arranged parallel to one another, namely a setpoint value strip (2), an actual value strip (3) and a display Strip (4).
- the setpoint strip (2) is a stepped tone value wedge with, for example, 16 reference tone value steps from 0% to 100%.
- the reference tone te of the tonal value wedge are largely independent of the process, ie they change only insignificantly with fluctuations in process parameters.
- a setpoint range (5) can be defined, which contains at least one reference tone level as the setpoint tolerance range that is to be achieved in the exposure and development process on the printing plate.
- the reference tone value levels of the tone value wedge are expediently selected such that the desired target value range (5) lies in the central area of the process control strip (1).
- a tone value wedge with continuously changing reference tone values can also be used.
- the tone value wedge of the setpoint strip (2) is designed as a line grid with lines (6) oriented perpendicular to the extent of the process control strip (1), which are composed of individual pixels during exposure.
- the reference tonal values of the tonal value wedge are defined by the ratio of line width to line interval of the line grid.
- the lines (6) of the tonal value wedge represent coarse signal elements. The size of the coarse signal elements changes only slightly in the event of fluctuations in the process parameters, since the process-dependent changes in the pixel sizes essentially only in the line direction at the lateral edges of the lines ( 6) lead to negligible tone value changes, whereby the reference tone values of the setpoint strip (2) are essentially process-independent.
- the structure of the line grid of the setpoint strip (2) is limited by the resolution of the human eye and should be chosen such that the integrating effect with respect to a homogeneous impression is not lost.
- a favorable value for the line spacing in the line grid is in the range of 10 to 16 times the value of the pixel diameter, which can be set by addressing when generating the grid point.
- the actual value strip (3) running parallel to the setpoint value strip (2) is finely patterned, for example with 333 lines / cm, and represents a strongly process-dependent but uniform tone value within the actual value strip (3).
- the actual value - Strip (3) consists of a large number of fine raster dots arranged in a raster, each raster dot within a raster mesh of the raster being composed of individual exposed pixels during the exposure. The sum of the exposed pixel areas or the halftone dot size within a grid mesh based on the total area of the grid mesh determines the exposed tonal value.
- the exposed pixels or the raster points composed of the exposed pixels within the actual value strip (3) form fine signal elements, the size of which changes as the process parameters fluctuate, which results in process-dependent tonal value changes.
- each screen dot is expediently populated from a comparatively large number of the pixels available within a screen mesh of the screen, for example from 2 x 2 exposed pixels within a screen size composed of 3 x 3 pixels nice.
- a process-dependent change in pixel size thus brings about a comparably high change in the percentage area share of the total area of a grid mesh, so that when the size of the pixel changes due to fluctuations in the process parameters, there are strong tonal value changes within the actual value strip (3).
- the structure of the grid in the actual value strip (3) with regard to the size of the grid mesh, the grid point size and the grid point shape is limited by the resolution of the printing plate to be exposed and is therefore dependent on the plate type and also on the addressing when generating the grid point .
- Practical values are 3 to 5 times the addressing for the side length of a square grid grid.
- Each pixel size or halftone dot size exposed on the actual value strip (3) of the process control strip (1) thus represents a tonal value obtained in the exposure process, which corresponds to a reference tonal value of the tonal value wedge of the setpoint strip (2).
- the nominal condition for the exposure process is met when the tone value reached in the actual value strip (3) falls within the defined target value range (5) of the target value strip (2).
- the process control strip (1) has a display strip (4) running parallel to the setpoint strip (2) and the actual value strip (3), which is arranged one behind the other in the strip longitudinal direction and with Symbols labeled display fields (7) is divided.
- the defined target value range (5) of the target value strip (2) is a display field (7a) z.
- the process control strip (1) advantageously provides a location-dependent statement as to whether the printing plate is correctly exposed, overexposed or underexposed.
- FIG. 3 shows a process control strip (1) simulated as a contone print. Since the reproduction of the real optical impression is not possible for printing reasons, the real optical impression is simulated in FIG. 3 by means of a contone print of the process control strip (1) .
- the visual tonal value comparison advantageously provides a continuous statement about the process stability.
- the distance between the "coarseness" of the line grid of the tonal value wedge in the setpoint strip (2) and the "fineness" of the dot grid in the actual value strip (3) determines the sensitivity of the control method.
- the calibration and control method using the process control strip (1) enables a highly sensitive quality assessment of the overall process of direct exposure and development of printing plates.
- the high level of sensitivity ensures, in particular, the increased quality requirements that exist when printing plates are exposed to frequency-modulated screens.
- 4 shows a basic block diagram of a device for the direct exposure of printing plates, in particular offset printing plates.
- the device essentially consists of a raster image processor (8), simply called RIP, a plate stabilizer (8) and a plate development station (10).
- a printing sheet to be exposed on the printing plate and the process control strip (1) to be exposed next to the printing sheet are mounted, for example, in an electronic assembly station according to an imposition program.
- the PostScript image data obtained in this way is then converted into a display list in an interpreter contained in the raster image processor (8).
- the display list is converted into corresponding control signal values in the form of a bitmap for pixel-by-pixel switching on and off in an exposure unit of the platesetter ( 9) generated exposure beam converted.
- the platesetter (9) performs the pixel-by-line exposure of the printing plate (11).
- the control signal values of the bitmap determine which pixels are exposed as parts of the halftone dots on the printing plate (11) or not.
- the raster function determines the size of the raster points depending on the tonal values to be recorded.
- the exposure beam is, for example, a laser beam which is switched on and off by means of a modulator controlled by the control signal values.
- the platesetter "Gutenberg" from Li ⁇ otype-Hell AG can be used as the platesetter (9), for example.
- the exposed printing sheet (12) and the process control strip (1) exposed outside the printing sheet (12) are visible on the printing plate (11) exposed in the plate exposer (9).
- a CTX printing plate from Polychrome for example, can be used as the printing plate (11).
- the exposed printing plate (11) is developed in the plate development station (10).
- the process control strip (1) on the exposed and developed printing plate (10 ') is then used for visual control of the exposure process and for setting the process parameters.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19507665A DE19507665A1 (en) | 1995-03-04 | 1995-03-04 | Exposure calibration and control procedures and exposure control strips |
DE19507665 | 1995-03-04 | ||
PCT/DE1996/000363 WO1996027821A1 (en) | 1995-03-04 | 1996-03-02 | Process control strip and a method of recording |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0759192A1 true EP0759192A1 (en) | 1997-02-26 |
EP0759192B1 EP0759192B1 (en) | 2003-01-02 |
Family
ID=7755685
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96903928A Expired - Lifetime EP0759192B1 (en) | 1995-03-04 | 1996-03-02 | Process control strip and a method of recording |
Country Status (5)
Country | Link |
---|---|
US (1) | US5748331A (en) |
EP (1) | EP0759192B1 (en) |
JP (1) | JP2888992B2 (en) |
DE (2) | DE19507665A1 (en) |
WO (1) | WO1996027821A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10104761A (en) * | 1996-10-02 | 1998-04-24 | Noritsu Koki Co Ltd | Automatic correcting method and device for surface light source |
EP0847858B1 (en) * | 1996-12-11 | 2002-07-24 | Agfa-Gevaert | Visual control strip for imageable media |
DE19825828A1 (en) * | 1998-06-10 | 1999-12-16 | Agfa Gevaert Ag | Control element for a radiation-sensitive recording material and method for determining the exposure energy for a radiation-sensitive recording material by means of a control element |
GB0012457D0 (en) * | 2000-05-22 | 2000-07-12 | Priest Mark | Calibrating printing machines |
DE60236099D1 (en) * | 2001-10-15 | 2010-06-02 | Toppan Printing Co Ltd | PRINTING, PRINTING AND PRINTING |
GB2392994A (en) * | 2002-05-30 | 2004-03-17 | Medivance Instr Ltd | Apparatus and method for monitoring the efficacy of an X-ray or photographic development process |
FR2865293B1 (en) * | 2004-01-20 | 2006-03-31 | Atmel Nantes Sa | MICROCONTROLLER WITH SYNCHRONIZED ANALOG DIGITAL CONVERTER. |
DE102004013290A1 (en) | 2004-03-18 | 2005-09-29 | Heidelberger Druckmaschinen Ag | Visual inspection device for exposed printing plates |
DE102006011140A1 (en) * | 2006-03-10 | 2007-09-13 | Heidelberger Druckmaschinen Ag | Process control strip and method for recording |
WO2008053719A1 (en) * | 2006-10-31 | 2008-05-08 | Konica Minolta Medical & Graphic, Inc. | Plate making method, printing plate image output device, image editing device and printing plate image output system |
US8570340B2 (en) | 2008-03-31 | 2013-10-29 | Konica Minolta Laboratory U.S.A., Inc. | Systems and methods for data compression |
US8699042B2 (en) * | 2008-06-12 | 2014-04-15 | Konica Minolta Laboratory U.S.A., Inc. | Systems and methods for multi-mode color blending |
DE102013010970A1 (en) | 2013-07-01 | 2015-01-08 | Heidelberger Druckmaschinen Ag | Specially screened gray field |
CN108594425B (en) * | 2016-07-24 | 2020-03-06 | 哈尔滨理工大学 | Contrast continuous adjusting method |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1012822A (en) * | 1972-11-13 | 1977-06-28 | American Hoechst Corporation | Test film and method of using same |
US4004923A (en) * | 1973-11-02 | 1977-01-25 | American Hoechst Corporation | Method of using a test film to measure developer activity |
DE2426840C3 (en) * | 1974-06-04 | 1978-04-13 | Deutsche Forschungsgesellschaft Fuer Druck Und Reproduktionstechnik E.V., 8000 Muenchen | Measuring strips |
JPS6024461B2 (en) * | 1976-11-22 | 1985-06-13 | 富士写真フイルム株式会社 | step tablet |
DE2905156C2 (en) * | 1979-02-10 | 1983-04-14 | Gerhard 8960 Kempten Werner | Test film to evaluate the edge sharpness and blackening of halftone dots in copy templates (halftone positives and halftone negatives) |
JPS58202445A (en) * | 1982-01-18 | 1983-11-25 | Dainippon Screen Mfg Co Ltd | Method for managing developing solution of photographic film and control strip used for execution of said method |
JPS5987050U (en) * | 1982-12-01 | 1984-06-12 | 富士写真フイルム株式会社 | step tablet |
US4504141A (en) * | 1983-07-07 | 1985-03-12 | Noby Yamakoshi | System for making matched backgrounds |
DE3409856A1 (en) * | 1984-03-17 | 1985-09-19 | Gerhard 8960 Kempten Werner | Monitoring element for image-transmitting methods, in particular for reproduction engineering and printing engineering |
DE4203237A1 (en) * | 1992-02-05 | 1993-08-19 | Ralf Dannapfel | Photographic exposure control esp. with corrected amt. of light - involves addn. to preselected amt. in accordance with prod. of measurement strip error and film-dependent gradation constant |
DE4303081C2 (en) * | 1992-02-18 | 1995-07-13 | Hell Ag Linotype | Method and device for exposure calibration of recording devices |
DE4316825C2 (en) * | 1993-05-19 | 1994-06-30 | Axel Ritz | Control strips for monitoring the transfer properties and tonal value changes of photopolymer printing plates |
DE4338975A1 (en) * | 1993-11-15 | 1995-05-18 | Fogra Forschungsgesellschaft D | Printing control field formation system |
-
1995
- 1995-03-04 DE DE19507665A patent/DE19507665A1/en not_active Withdrawn
-
1996
- 1996-03-02 JP JP8526526A patent/JP2888992B2/en not_active Expired - Fee Related
- 1996-03-02 DE DE59610020T patent/DE59610020D1/en not_active Expired - Lifetime
- 1996-03-02 EP EP96903928A patent/EP0759192B1/en not_active Expired - Lifetime
- 1996-03-02 WO PCT/DE1996/000363 patent/WO1996027821A1/en active IP Right Grant
- 1996-03-02 US US08/732,299 patent/US5748331A/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9627821A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2888992B2 (en) | 1999-05-10 |
WO1996027821A1 (en) | 1996-09-12 |
EP0759192B1 (en) | 2003-01-02 |
DE19507665A1 (en) | 1996-09-05 |
JPH09505678A (en) | 1997-06-03 |
US5748331A (en) | 1998-05-05 |
DE59610020D1 (en) | 2003-02-06 |
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