EP0255924A2 - Procédé et dispositif pour influencer l'encrage d'une surface encrée dans une machine à imprimer - Google Patents

Procédé et dispositif pour influencer l'encrage d'une surface encrée dans une machine à imprimer Download PDF

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Publication number
EP0255924A2
EP0255924A2 EP87111135A EP87111135A EP0255924A2 EP 0255924 A2 EP0255924 A2 EP 0255924A2 EP 87111135 A EP87111135 A EP 87111135A EP 87111135 A EP87111135 A EP 87111135A EP 0255924 A2 EP0255924 A2 EP 0255924A2
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Prior art keywords
color
partial
area
influenced
test
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EP87111135A
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German (de)
English (en)
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EP0255924B1 (fr
EP0255924A3 (en
Inventor
Friedrich Dr.Dipl.-Phys. Dolezalek
Karl-Heinz Besson
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Fogra Deutsche Forschungsgesellschaft fur Druck- und Reproduktionstechnik Ev
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Fogra Deutsche Forschungsgesellschaft fur Druck- und Reproduktionstechnik Ev
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Priority to AT87111135T priority Critical patent/ATE88414T1/de
Publication of EP0255924A2 publication Critical patent/EP0255924A2/fr
Publication of EP0255924A3 publication Critical patent/EP0255924A3/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2233/00—Arrangements for the operation of printing presses
    • B41P2233/50—Marks on printed material
    • B41P2233/51—Marks on printed material for colour quality control

Definitions

  • offset printing, gravure printing, letterpress printing) or as a so-called color proof copy process (also called proofing process) as a proofing substitute in reproduction technology are used or the non-impact methods, such as inkjet printing, transfer thermography, electrophotography and screen printing.
  • Fig. 1 the surface division of a typical printing sheet 51 that can be produced with the printing processes mentioned is sketched.
  • a pressure control bar 52 which contains test areas for preferably densitometric process control.
  • the subject on the overall format surface of the printed sheet 51 here consists of eight pages of an illustrated printed document, which includes both illustrations 54 and text 55. Particularly highlighted is a colored area 56, which is part of an illustration here. This color area - there can also be several such areas - is selected by the printer on the subject.
  • the printer periodically checks the print result by visually and possibly also measuring the hand made of the actual copy 62 (FIG. 2) with respect to the color appearance of the color area 56 to be influenced, with a reference copy 61 serving as a reference, on the print control bar 52 compares. If no target copy 61 is available, the comparison is carried out using target measured values which have been determined on the basis of previous experience.
  • the differences "actual measured value minus desired measured value” are formed from the actual measured values and the target measured values determined on actual copy 62 and are interpreted as a control deviation in the control-technical sense. In the case of density measurement, there are differences in density values and in the case of color measurement, colorimetric difference values.
  • the influencing required by control technology is carried out by means of a correction in the coloring of the relevant partial color by hand.
  • “Correction in coloring” is understood to mean a change in the area-related application quantity of the partial color, regardless of whether it is a change in the effective area coverage or in the layer thickness.
  • control systems are known in which each control deviation can be converted fully automatically into a control command for correcting the coloring of the relevant partial color.
  • An interruption of the control loop by the operating personnel is also possible and sensible here, since the production process can also be strongly influenced by other faults which cannot be detected with the selected test areas. An example of this is the influence of the dampening solution in the offset process.
  • test areas used for the measurement differ very greatly in terms of the area coverage of the partial colors from the corresponding values of the color area to be influenced.
  • known control methods only ensure that the color appearance of the test areas remains constant; this does not always have to apply to the color area to be influenced.
  • the color appearance of these control fields can be kept constant; however, this does not necessarily also apply to the color appearance of a light tone. This depends not only on the layer thickness that can be controlled with full-tone control fields, but also strongly on production-related fluctuations in the area coverage in the light tone range.
  • the purpose of the automatic control or the control carried out by the operator is to either use the coloring in an existing target copy based on the e.g. to reproduce density values measured on test areas as precisely as possible or to achieve a coloring that is characterized by a set of predetermined target density values.
  • the color matches the original to a large extent and in printing processes for large runs (e.g. offset printing, gravure printing, letterpress printing, screen printing) the production-related fluctuations are limited one edition.
  • a disadvantage of the previously known influencing methods is that the partial colors involved in the image construction are reproduced regardless of whether the color appearance of the color area of the actual copy 62 to be influenced only differs in brightness or in the direction of a color cast from that of the target copy 61. Since in conventional illustration printing color casts are perceived much more critically by the viewer than brightness deviations, the known control methods often carry out unnecessary control processes which only serve to eliminate a harmless brightness deviation. Since every control process causes unrest in the color flow and requires a longer stabilization phase, control should be as little as possible.
  • DE-A-30 07 421 specifies a method for producing a true-to-original color mixture which is based on densitometric measurements and describes the solution to a task which can usually only be accomplished by spectrophotometric color measurement. However, it is not disclosed how differences found between the given target value and the measured actual value are interpreted in the sense of a color space that is equally graded according to sensation, and in particular how these differences can be evaluated in terms of a change in brightness and / or color cast.
  • FIG. 3 shows the U * - V * diagram belonging to the color spaces according to CIE-UCS-1964 or CIELUV, which are approximately equally perceived as an example. It is a right-angled Cartesian coordinate system with linear and scaled axes for the colorimetric coordinates U * and V *.
  • the coordinate W or L * (CIELUV) is plotted on an axis perpendicular to it and describes the brightness. All colors of the same color type lie on the same beam originating in the U * - V * plane.
  • the color saturation increases with increasing distance from the origin.
  • the polar angle indicates the color and the radius the saturation, the pole represents the neutral gray or white color, it is also called the achromatic point.
  • the invention is based on a method according to the preamble of claim 1. It is based on the object of designing such a method in such a way that, while avoiding the deficiencies described in the prior art, an improved, in particular more targeted influencing of the color appearance of the color surface is achieved during a printing process.
  • Fig. 4 shows a level of the same brightness of the CIE-UCS-1964 or CIELUV color space.
  • the axes U * and V "known from FIG. 3 were shifted parallel so that the (initially unknown) target color location of the color surface 56 to be influenced with regard to its color appearance is now at the origin 0.
  • the partial color directions 71 C * , M * are entered by arrows.
  • the density differences of the partial colors are determined;
  • the partial color black is regulated separately according to the state of the art.
  • the density value difference of each colored partial color is understood as the absolute amount (length) of a partial color vector 72, the direction of which corresponds to the associated partial color direction 71.
  • the vectorial addition of the partial color vectors 72 shows from the origin 0 after the point P '; the vector 0 P 'is referred to as the sum vector 73.
  • the point P ' is the actual color location approximated by means of vectorial construction. When measuring with a color measuring device, the actual actual color location is determined directly, it is designated here with P ".
  • a print product is produced on a four-color offset printing machine, the images of which are created by four-color overprinting with suitably graded coloring in the basic colors black, cyan, magenta and yellow.
  • additional control fields with 80% area coverage are used on the four printing forms as test areas densitometric measurement attached.
  • the narrowband polarization densitometer on the control fields of the target specimen is zeroed in all four colors, as a result of which the density values are stored as target measured values.
  • actual copies are drawn and measured at regular intervals; the actual values displayed for such an actual copy are black 0.1, cyan -0.14, magenta 0.17 and yellow -0.20. While the density deviation black is controlled separately, the actual measured values of cyan, magenta, yellow are compared with the scale factors 51; empirically determined by a previous test run with densitometric and colorimetric measurement; 40.5 and 39 multiplied and in a diagram according to FIG. 3, but provided with the axis inscriptions AU * and ⁇ V *, in the partial color directions cyan, magenta and yellow as partial color vectors 72 starting from the zero point registered.
  • Fig.5 are the vectors as well as their addition, the sum vector 73 which shows the point P from the origin.
  • the absolute amount of the sum vector 73 specifies with 10.5 units the approximate color difference of the actual copy from the target copy without taking into account the brightness for the shade shade balance selected as the color area to be influenced in sensory units ⁇ E of the color spaces CIE-UCS-1964, CIELUV or CIELAB.
  • the polar angle 342 ° denotes the approximate direction of the color shift that has occurred, here towards red-violet.
  • the change in the brightness coordinate, W * in the CIE-UCS-1964 system and L * in the systems CIELAB and CIELUV, can be calculated in two different ways for the example mentioned.
  • the first perception-based method starts from the density value differences in the 80% test areas and relates these to the shadow tone balance color area to be assessed in terms of brightness.
  • the change in brightness AL is calculated from the linear combination
  • ⁇ L -0.72 ⁇ 29 ⁇ ⁇ Dc -0.57 ⁇ 45 ⁇ ⁇ D M -0.55 * 5, ⁇ ⁇ Dy,
  • the process to be controlled or regulated is a raster print and the color area to be influenced is an almost neutral gray shade area, here referred to as shade balance, which is characterized by the Overprinting of the areas of coverage cyan, magenta, yellow and possibly also black, graded according to the known reprotechnical gray condition, and that test areas printed with only one partial color, for example summarized in a print control strip, are available for the densitometric measurement.
  • target values are the density values of the test areas cyan, magenta, yellow with the densitometer set to the respective color; the density value of the test area black is also measured.
  • the degree of area coverage of the film templates belonging to the test areas should be selected in the raster positive in the range from 40% to 80%, whereby the combination of cyan 72%, magenta 57% and yellow 55% belonging to a shade shade balance and other, similar gradations are therefore preferred are because, under normal printing conditions in offset printing, they produce an almost neutral gray, dark color tone when printed three times on top of one another, which is very sensitive to the smallest fluctuations in the color of one or more of the partial colors involved. Such colored areas therefore have a signal function; in the event of fluctuations in the printing process, the color locus changes that can be measured by them are always greater than with all other color areas, also composed of three colorful partial colors, with the same or greater brightness.
  • the density value differences "actual measurement value minus target measurement value" of the colored partial colors after previous multiplication with scale factors are interpreted as absolute amounts of partial color vectors 72, which here point from the origin of a color space that is equally spaced in each case approximately in the direction of the color location of the associated full tone . In the general case, they each point from the target color location of the color area to be influenced approximately to the target color location of the fully saturated partial color.
  • the color space is preferably the CIE-UCS-1964. the CIELAB or the CIELUV system.
  • the partial color directions 71 which are the most favorable for the method according to the invention (in individual cases possibly slightly different from the directions of the fully saturated partial colors) and the most favorable scale factors can be determined according to the following method and its corresponding modifications: A color area designed as a shade balance is made with a systematic variation of the coloring the colored part colors are subjected to the printing process. The color locations of the balance, the full tones of the bright primary colors and those of their mixed colors of the first order are then measured with a color measuring device in some, typically different, specimens. The values of a target copy with an almost ideal gray shade balance are interpreted as target measurement values and subtracted from the corresponding values of the actual copies; the result is entered in a level of the same color space of equal brightness.
  • FIG. 6 shows the result of such an experimental run in a diagram based on the pattern from FIG. 5, the target color location of the almost ideal gray target specimen being in the origin.
  • the target color words of the basic and mixed colors lying far outside the diagram are only marked as partial color directions 71 here. Instead of the direction M * , however, the partial color direction M 'is used for the construction.
  • the end points A 'to F' of the sum vectors 73 are entered in this diagram on the basis of the density value differences cyan, magenta and yellow determined with a densitometer. It had previously been determined by repeated trials that the scale factors and partial color directions 71 given in Table 1 gave the best approximation of the densitometric auxiliary construction to the color locus measured by colorimetry (A to F in FIG. 6) of the shadow tone balance color area to be influenced here.
  • the quality of the approximation was assessed on the basis of the mean square deviations at polar angle or distance, whereby values between 9 ° and 18 ° or 2.2 to 3.8 units AE CIELUV or CIE-UCS-1964 resulted.
  • the assumption was confirmed that the approximation works most precisely if measurements are taken in test areas whose area coverage comes closest to that of the color area to be influenced by color.
  • the scale factors of Table 1 are shown as products of the area coverage of the respective partial color in the color area to be influenced by color and in this case a calibration factor (f) that is the same for all brightly colored partial colors.
  • D is the color density of the partial color in question in the monochrome test area. In the case of multicolored test areas, individual color densities of the matrix multiplication must first be converted using a method to be described later.
  • the pair of constants m, n also depends on the printing characteristic of the partial color in question during the printing process, so it makes sense to determine m by running the test under the prevailing conditions. As tests have shown, it is often sufficient to use the same calibration factor f for all partial colors. In this case, D means the mean of the densities of the colored partial colors measured in the test area or areas.
  • the factor "area coverage” takes into account the fact that a measured change in the coloring of a partial color can only be effective to the extent that it is represented in the color area to be assessed. Therefore, the same production fluctuations, e.g. in a mid-tone balance color area with C 28 M 21 Y 19 about a factor of 2 to 3 less than in a shadow tone balance with C 72 M 57 Y 55, which has about 2.5 times higher area coverage.
  • Fig. 7 the color deviations of 12 different color areas and a shade tone balance measured directly with a color measuring device are entered, which resulted from a comparison of two specimens from the test run on which Fig. 6 is based.
  • the color areas 31 - 48 are selected according to DIN 6169, F is the color location of the shade balance.
  • the color words of the target copy are in the origin, only the colorimetric difference values are plotted.
  • the deviation of the shadow tone balance color area shows a green cast corresponding to the trend of the shifting directions of the other colors; the absolute amount of the shift is maximum here. The same observation was also made for the other actual copies evaluated for FIG. 6.
  • the deviation of the shadow tone balance color area can therefore be referred to in absolute terms as the upper limit for the corresponding values of all other color areas as long as they are not darker than this balance color area.
  • the polar angle of the deviation also applies to most other colored areas.
  • An exception here are those colored areas which predominantly only contain portions of two brightly colored partial colors or also the partial colors themselves.
  • the colored areas 36, 38 and 42 break out of the directional trend.
  • their direction of displacement can also be determined from the difference in density values according to the vectorial auxiliary construction according to the invention, if one observes that one of the three scale factors must disappear here, since the area coverage in question is zero.
  • the application of 36 C 0.55; M 0.39; Y 0.00 calculated scale factors gives the point P 'after addition of the vectors, which satisfactorily approximates the deviation of the color surface 36.
  • the change in the brightness coordinate can be indicated as follows:
  • D B is the density value black measured in single print on a black control field and AD B its change.
  • the solution of the object according to the invention for the general case with the clarity-limited restriction to the control or regulation of the color appearance of a shade tone balance color surface to be produced in the raster printing and to be influenced with regard to its color appearance using only densitometric measurements test areas printed with a partial color.
  • the application of this teaching to any color areas to be influenced and any test areas is already given by the division of the scale factors given in Table 1 into the area coverage of the color area to be influenced on the film template, the printing form or the print copy and the calibration factor related to the test area and the densitometer f mapped.
  • D is the optical density (transmitted light or light) of the color area to be influenced on the film template and D max is the density of the template which leads to the maximum color application during the printing process.
  • the correct choice of scale factors and partial color directions 72 can be checked and, if necessary, improved by a printing test with systematic variation of the coloring of the partial colors and subsequent evaluation using a densitometer and color measuring device according to the methods described above, so as to improve the requirements for the application of the invention Create tax or regulatory procedures.
  • the solution to the problem according to the invention is not linked to the previously highlighted partial colors cyan, magenta and yellow, but rather any desired partial colors can be used for image construction.
  • the method according to the invention can also be used to produce color proof copies (proof) or proofs (based on a sample as a target copy or according to target density values), on the setup process when preparing the print run based on a given proof as a target copy , a color proof copy or a previous edition print and finally for other, comparable working printing processes such as Use high pressure, flexographic printing, ink jet printing, transfer thermography, electrophotography and screen printing, provided that the image structure is made up of at least three colorful partial colors (with different hues) that can be influenced with regard to coloring.
  • a pressure control bar which contains at least one shadow tone balance control field in each zone and additionally e.g. Solid patches for four to six colors (see example 3).
  • the densitometer measures the density values cyan, magenta and yellow in each shadow tone balance control field of an actual copy and compares it with that of a target copy or with target measurement values from a previous production. From the determined density value differences the associated uncoated density value differences calculated, which would have resulted approximately with the monochrome printing.
  • the approach is: A'DA
  • magenta of the shadow balance control field is measured in a single print to be made for this purpose using the densitometer set to cyan, and the density value obtained is divided by that which is measured after switching to magenta. This applies analogously to the other coefficients.
  • the system of equations is then solved according to Kramer's rule according to the uncoated density value differences.
  • the specimens on which the pressure test of FIG. 6 was based were measured densitometrically directly in a shadow tone balance control field. Then the previously determined coefficient matrix ⁇ a nm ⁇ the density value differences AD c , AD M , ADy are calculated. After multiplication by the respective scale factors according to Table 1, these were plotted in FIG. 9 and put together vectorially.
  • the points A 'to F' obtained in this way correspond to the color locations A to F measured by colorimetry except for mean square deviations of 16 ° in the polar angle and 3 units AE CIE in the color distance. This means that the densitometric measurement in a shadow tone balance control field is sufficiently precise to enable a control or. Control procedure to obtain sufficient information about the type and extent of a color cast.
  • the print copies on a specified selection of test areas in the subject itself e.g. measured densitometrically, and the mean values of the density values obtained in this way are calculated for the settings cyan, magenta, yellow and black of the densitometer. (See Fig. 10).
  • those image areas 81 are selected as test areas in which many colorful partial colors with an area coverage of between 40% and 80% (on the film or the printing form) are involved, such as tri-color mixed darker gray, brown and olive green tones. If the subject to be printed contains no such tones, the image areas should be selected so that the areas of coverage averaged over these image areas are in the specified range for each partial color.
  • the density measurement at the specified image points can e.g.
  • the limitation of the measurement to specific image areas 81 can be achieved by a suitable choice of the measurement positions and / or by measurement that is timed and synchronized with the printing process.
  • the mean density values of cyan, magenta, yellow and black obtained from the target specimen may be viewed separately according to pressure zones 83 (measuring positions across the machine width) as target measured values.
  • the density value differences that occur during production are used after conversion for manual control or for automatic regulation using the method according to the invention.
  • the determination of the density values required for this, which would have resulted from the individual printing of the partial colors, is carried out analogously according to the same method that has already been specified for the measurement on the tri-color shadow tone balance control field.
  • the density value differences AD 'between the measured actual measured values and the target measured values of a target specimen were converted into density value differences AD for cyan, magenta, yellow and black, which would have resulted on single-color prints, using a linear system of equations.
  • the scale factors were obtained from the mean value of the density values cyan, magenta and yellow according to equation (1) 0.71 x 106 for cyan, 0.57 x 106 for magenta and 0.55 x 106 for yellow, they apply to the color appearance of a shadow tone balance color area.
  • test areas on which the measurement takes place e.g. single-color control fields or multi-color control fields as a balance
  • a color area to be influenced the color appearance of which is assessed as decisive for the usability of the manufactured product or as a guarantee for the correct color rendering.
  • the test area can be identical to the color area to be influenced.
  • the area of color to be influenced must be at least approximately known in terms of its area coverage for the colored partial colors. It is not necessary that it is actually present on the subject to be printed. In this way, a print can be controlled in such a way that the color appearance of a fictitious shadow tone balance color area (not included in the subject) would remain constant. This ensures that all color areas not too far from the gray axis in terms of colorimetry (with no less brightness) remain approximately constant.
  • the advantage of selecting such fictitious color areas to be influenced is that their parameters can be conveniently taken from a color atlas, while the areas of coverage of color areas of the subject are generally not sufficiently well known.
  • the signal processing path of a densitometer shows the signal processing path of a densitometer according to the invention; the mechanical, optical and other electronic components are not shown.
  • the light of light source 1 reflected by the test surface of the target or actual copy is detected in sensor 2.
  • the signal which is initially in analog form, is brought into digital form in an analog / digital converter 3, preferably in 16-bit form.
  • Averaging also takes place here if the corresponding input instruction a from unit 5 is present.
  • the density measured values b located in the target measured value memory in unit 5 are either entered by the user or stored by a target copy; they are subtracted from the actual measured values in unit 6. If the measurements were not carried out on single-color image areas or control fields, the matrix calculation of the individual color densities from the total color densities is carried out in unit 7.
  • the sum vector 73 o P and the brightness coordinate are calculated in unit 8 if the inputs c: “setpoints of the saturated, colorful partial colors” and “area coverage of the color area to be influenced” from unit 5 are present.
  • the sum vector 73 oP and preferably also the partial color vectors 72, for example and the brightness coordinate are displayed graphically (preferably in color) in an output unit 11 on the screen or on an XY recorder, for example in the manner of FIGS. 3 and 5.
  • the numerical or verbal output of the density value differences of the partial colors e.g. cyan, magenta, yellow, black
  • the absolute amount of the sum vector e.g.
  • the limit value indicator 9 can also be warned by the limit value indicator 9 as soon as the absolute value of the sum vector o P or the change in the brightness coordinate exceeds a defined size or the polar angle is in a region to be regarded as critical, for example green tinge when printing skin tones.
  • a setting of the limit value detector 9 is preferred in which the limit value for the absolute amount of the sum vector is substantially lower than that of the change in the brightness coordinate.
  • the operator can also find out about the size and direction of the deviations for this color area.
  • Unit 12 performs the output of the control recommendation in density value units, or already converted to the relevant manipulated variable (eg color slide position, duct position).
  • a control recommendation is given which compensates for the deviation in a single control section. If neither of the two limit values is exceeded, one becomes by the factor (namely the larger of the two) reduced tax recommendation.
  • the control recommendation is output in alphanumeric or graphic form on the output unit 11.
  • the machine operator carries out the control corrections recommended to him. If only densitometric control corrections are output, he must carry out the conversion into values of the associated manipulated variable for the coloring based on his experience. The success of the correction carried out is checked densitometrically on a further actual copy, resulting in new tax recommendations, etc.
  • the device is shown in Fig. 13 according to the pattern of Fig. 12 in the form of a signal flow diagram. The mechanical, optical and other electronic components are not shown.
  • the signal path up to and including the analog / digital converter 3 is as described in Example 1.
  • the signals measured either "on-line” in the production machine or "off-line” on a drawn actual copy are converted in unit 4 into actual measured values for the density; if there is a corresponding instruction c from unit 5, mean values of the density values of several test areas, e.g. Images or successive "on-line” measured actual copies are formed.
  • the associated density values or their mean values are preferably calculated in each ink zone and, after evaluation, finally converted into control commands.
  • unit 6 and 7 The description of units 6 and 7 is as in example 1.
  • unit 8 the approximated colorimetric deviations are calculated according to the inputs c from unit 5, it being possible to enter the color area to be influenced here.
  • the sum vector 0 P and its partial color vectors are displayed numerically and / or graphically in an output unit 11, possibly for each color zone and different color areas to be influenced.
  • a limit indicator 9 is provided, which warns when the predetermined limits for the amount or direction of the deviation sum vector and brightness coordinate are exceeded.
  • control recommendations for the actuators of the paint application e.g. paint slide opening, duct stroke
  • the conversion factor between control deviation and correcting variable correction is called the control factor here.
  • control commands are sent to the servomotors 13 of the inking unit.
  • the success of the actuating process is densitometrically checked on an actual copy taken later, which may result in a further control process, etc.
  • a film sheet (or several film sheets), which consists of a series of templates for control fields, which, after assembly as intended and subsequent copying onto the associated printing forms of the partial colors, produce a so-called print control bar consisting of control field images of different partial colors during the printing process.
  • This is preferably allowed so that in each pressure zone, i.e. every 30 to 40 mm, a shadow tone balance control field is present, which has a graded area coverage on the original according to a reproduction photographic gray condition that is suitable for normal printing conditions. Examples are C 72, M 57, Y 55 and C 75, M 62, Y 60 for positive copies in offset printing on art paper.
  • solid color fields of the partial colors as well as their overprinting and grid fields for the partial color black in three-quarter tone should be available.
  • a control field 21 of 5 ⁇ 5 mm 2 in size designed as a shadow tone balance is present in each zone, here assumed to be 30 mm, and a further control field 22 designed as a midtone balance is present in every second zone.
  • the image reproduction in the mid-range can be influenced particularly well.
  • a grid 23 for black with 80% area coverage in every second zone. The latter makes the coloring of black controllable, the measurement of the coloring of the colored partial colors takes place in the control fields 21 and 22.
  • a control field 21 and 22 are present in each zone, also assumed here with 30 mm.
  • solid tone fields 24, copy control fields 25 and line grid pairs 26 are provided for all partial colors; they repeat approximately every 9 zones.
  • the devices described above are not suitable for raster printing, but also for those printing processes that work with rastered originals.
  • the devices according to Example 3 can also be used for completely rasterless processes if 21, 22, 23, 24 are designed as halftone fields, with the proviso that instead of the area coverage size, the calculated size given in equation (4) is used.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Color, Gradation (AREA)
  • Printing Methods (AREA)
EP87111135A 1986-08-05 1987-07-31 Procédé et dispositif pour influencer l'encrage d'une surface encrée dans une machine à imprimer Expired - Lifetime EP0255924B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87111135T ATE88414T1 (de) 1986-08-05 1987-07-31 Verfahren und vorrichtung zur beeinflussung der farblichen erscheinung einer farbflaeche bei einem druckvorgang.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863626423 DE3626423A1 (de) 1986-08-05 1986-08-05 Verfahren und vorrichtung zur beeinflussung der farblichen erscheinung einer farbflaeche bei einem druckvorgang
DE3626423 1986-08-05

Publications (3)

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EP0255924A2 true EP0255924A2 (fr) 1988-02-17
EP0255924A3 EP0255924A3 (en) 1990-05-02
EP0255924B1 EP0255924B1 (fr) 1993-04-21

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EP87108516A Expired - Lifetime EP0255586B1 (fr) 1986-08-05 1987-06-12 Procédé et dispositif pour influencer l'encrage d'une surface encrée dans une machine à imprimer
EP87111135A Expired - Lifetime EP0255924B1 (fr) 1986-08-05 1987-07-31 Procédé et dispositif pour influencer l'encrage d'une surface encrée dans une machine à imprimer

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EP87108516A Expired - Lifetime EP0255586B1 (fr) 1986-08-05 1987-06-12 Procédé et dispositif pour influencer l'encrage d'une surface encrée dans une machine à imprimer

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US (1) US4901254A (fr)
EP (2) EP0255586B1 (fr)
AT (2) ATE73392T1 (fr)
DE (3) DE3626423A1 (fr)

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EP0272468A3 (en) * 1986-12-20 1989-03-15 Heidelberger Druckmaschinen Aktiengesellschaft Print checking bars
EP0356705A3 (fr) * 1988-08-30 1991-05-08 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Lecture de données pour un dispositif de réglage de l'encre
EP0434072A3 (en) * 1989-12-21 1991-10-30 Harald Dr. Krzyminski Printing control strip
US5224421A (en) * 1992-04-28 1993-07-06 Heidelberg Harris, Inc. Method for color adjustment and control in a printing press
EP0408507B1 (fr) * 1989-07-14 1993-11-10 GRETAG Aktiengesellschaft Méthode de détermination des écarts de couleur entre deux surfaces tramées imprimées avec une machine d'impression ainsi que méthode de commande ou réglage de l'impression couleurs d'une machine à imprimer
EP0734862A1 (fr) * 1995-03-25 1996-10-02 MAN Roland Druckmaschinen AG Procédé pour détecter des impuretés de couleur

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DE3812099C2 (de) * 1988-04-12 1995-01-26 Heidelberger Druckmasch Ag Verfahren zur Farbsteuerung einer Offsetdruckmaschine
DE3830731A1 (de) * 1988-09-09 1990-03-22 Heidelberger Druckmasch Ag Vorrichtung zur farbmessung
DE3903981C2 (de) * 1989-02-10 1998-04-09 Heidelberger Druckmasch Ag Verfahren zur Regelung der Farbfüllung bei einer Druckmaschine
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DE69125519D1 (de) * 1990-02-05 1997-05-15 Scitex Corp Ltd Geräte und Verfahren zur Verarbeitung von Daten, wie zum Beispiel Farbbildern
DE4005558A1 (de) * 1990-02-22 1991-09-19 Roland Man Druckmasch Verfahren zur prozessdiagnose einer rotationsdruckmaschine anhand von remissionen von vollton- und rastertonfeldern
EP0495563B2 (fr) † 1991-01-15 2004-09-29 Creo IL.Ltd. Appareil et techniques pour l'impression informatisée
DE4104537C2 (de) * 1991-02-14 1999-05-12 Roland Man Druckmasch Verfahren zur Steuerung einer Farbführung einer Offset-Druckmaschine
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EP0563498B1 (fr) * 1992-03-30 1996-06-19 Ciba-Geigy Ag Procédé d'impression en plusieurs couleurs, particulièrement procédé d'impression de trame en plusieurs couleurs
DE4240077C2 (de) * 1992-11-28 1997-01-16 Heidelberger Druckmasch Ag Verfahren zur zonalen Steuerung/Regelung der Farbführung in einer Druckmaschine
DE4335229C2 (de) * 1993-10-15 1998-07-16 Heidelberger Druckmasch Ag Verfahren zum Erzeugen von auf einer Offsetdruckmaschine hergestellten Farbmustern
DE4335350A1 (de) * 1993-10-16 1995-04-20 Heidelberger Druckmasch Ag Verfahren und Vorrichtung zur Ermittlung von Passerabweichungen bei mehrfarbigen, in einer Druckmaschine erstellten Druckprodukten
DE4402828C2 (de) * 1994-01-31 2001-07-12 Wifag Maschf Messfeldgruppe und Verfahren zur Qualitätsdatenerfassung unter Verwendung der Messfeldgruppe
DE4402784C2 (de) * 1994-01-31 2001-05-31 Wifag Maschf Messfeldgruppe und Verfahren zur Qualitätsdatenerfassung unter Verwendung der Messfeldgruppe
DE19515499C2 (de) * 1995-04-27 1997-03-06 Heidelberger Druckmasch Ag Verfahren zur simultanen Mehrfarbregelung beim Drucken
US5740076A (en) * 1995-11-30 1998-04-14 Candela, Ltd. System for describing a color gamut in a graphical data processing system
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ATE281935T1 (de) 1999-09-06 2004-11-15 Komori Printing Mach Color-management-verfahren und -vorrichtung für eine druckmaschine
EP1156667A3 (fr) * 2000-05-17 2004-05-06 Komori Corporation Procédé et dispositif de gestion de couleurs dans une machine à imprimer
JP4194289B2 (ja) * 2001-04-06 2008-12-10 キヤノン株式会社 画像処理方法
JP2003118085A (ja) * 2001-10-10 2003-04-23 Dainippon Screen Mfg Co Ltd 印刷装置
JP3880831B2 (ja) * 2001-10-10 2007-02-14 大日本スクリーン製造株式会社 インキプリセット方法
US6792863B2 (en) * 2001-10-15 2004-09-21 Dainippon Screen Mfg Co., Ltd. Printing apparatus for automatically controlling ink supply device
US7177476B2 (en) * 2002-02-28 2007-02-13 Eastman Kodak Company Method of decoding data encoded in a monochrome medium
DE102004009271A1 (de) * 2004-02-26 2005-09-15 Man Roland Druckmaschinen Ag Verfahren zur Farbregelung an Druckmaschinen
JP5022682B2 (ja) * 2006-11-30 2012-09-12 リョービ株式会社 カラー印刷機の印刷画像品質管理方法及び印刷画像品質管理装置
US9536322B1 (en) 2007-05-15 2017-01-03 Peter Harmon Smith Implementation of multi-camera tracking applications using rich color transition curve target sequences
US8526717B2 (en) * 2007-05-15 2013-09-03 Vision Interface Technologies, LLC Rich color transition curve tracking method
JP2010023498A (ja) * 2008-06-18 2010-02-04 Canon Inc インクジェット記録装置および記録画像の乾燥条件決定方法
DE102013109920A1 (de) * 2013-09-10 2015-03-12 Manroland Web Systems Gmbh Verfahren zum Bedrucken eines Bedruckstoffs
JP6181025B2 (ja) * 2014-09-26 2017-08-16 富士フイルム株式会社 印刷物の測定位置決定方法及び装置並びに測定方法
WO2016047378A1 (fr) * 2014-09-26 2016-03-31 富士フイルム株式会社 Procédé de présentation de position de mesure, procédé de production de guide de présentation de position de mesure, procédé de mesure de matière imprimée, procédé de détermination de position de mesure de matière imprimée, et dispositif de détermination de position de mesure de matière imprimée
JP6285837B2 (ja) * 2014-09-26 2018-02-28 富士フイルム株式会社 測定位置提示方法及び測定位置提示ガイドの製造方法並びに印刷物の測定方法
CN120238615A (zh) * 2025-06-03 2025-07-01 北京弘浩千瑞科技有限公司 一种胶印机的色彩还原控制方法及系统

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0272468A3 (en) * 1986-12-20 1989-03-15 Heidelberger Druckmaschinen Aktiengesellschaft Print checking bars
EP0356705A3 (fr) * 1988-08-30 1991-05-08 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Lecture de données pour un dispositif de réglage de l'encre
EP0408507B1 (fr) * 1989-07-14 1993-11-10 GRETAG Aktiengesellschaft Méthode de détermination des écarts de couleur entre deux surfaces tramées imprimées avec une machine d'impression ainsi que méthode de commande ou réglage de l'impression couleurs d'une machine à imprimer
EP0434072A3 (en) * 1989-12-21 1991-10-30 Harald Dr. Krzyminski Printing control strip
US5224421A (en) * 1992-04-28 1993-07-06 Heidelberg Harris, Inc. Method for color adjustment and control in a printing press
EP0734862A1 (fr) * 1995-03-25 1996-10-02 MAN Roland Druckmaschinen AG Procédé pour détecter des impuretés de couleur

Also Published As

Publication number Publication date
US4901254A (en) 1990-02-13
ATE88414T1 (de) 1993-05-15
ATE73392T1 (de) 1992-03-15
EP0255924B1 (fr) 1993-04-21
DE3785510D1 (de) 1993-05-27
EP0255586B1 (fr) 1992-03-11
EP0255924A3 (en) 1990-05-02
EP0255586A3 (en) 1988-12-07
DE3626423A1 (de) 1988-02-11
DE3777277D1 (de) 1992-04-16
EP0255586A2 (fr) 1988-02-10

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