Method and system for producing printing forms for anilox printing presses

A method and a system for producing a printing form for a printing process on a printing press, produces a first printing form based on first image data and prints a printing image on a printing substrate with the printing form. Printing presses without inking zones do not permit regulation of quantitative ink supply with inking zones screws. To permit a printer to manipulate ink density on a printing substrate even after exposure of a first printing plate within a printing press without inking zones, correction values are generated in the vicinity of the printing press in regions on the basis of at least a printing image printed on the printing substrate. The correction values are then used for correcting printing originals on which printing is based and/or screened image data and at least one second printing form is produced on the basis of at least the correction values.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority, under 35 U.S.C. §119, of German application DE 10 2006 050 539.4, filed Oct. 26, 2006; the prior application is herewith incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a method and a system for producing at least one printing form for a printing process on a printing press, in which a first printing form is produced on the basis of first image data, and a printing image is printed on a printing substrate with the printing form.

The proposed method and the proposed system are intended to solve problems, in particular, which occur in the use of printing presses without inking zones, such as anilox printing presses.

A corresponding printing press is described in European Patent Application EP 0 870 609 A2. Reference is made in that case to the full scope of the device which is described therein for a printing press of that type having an anilox roll, that is to say an engraved roll, an applicator roll, a printing form cylinder and an inking system.

In conventional offset printing presses which have inking zones, the supply of the printing ink is set in zones through the use of an inking zone controller. As a result, the ink density and, in particular, the tonal value of the printing image as well, can be regulated within the printing press in the corresponding zones during printing. The control of zone screws which regulates the ink quantity is generally regulated in that case according to the current prior art, as a function of printing originals for different printing inks. Printing inks which are generally used in four color printing are the printing inks cyan, magenta, yellow and black (CMYK). The printing originals which are separated according to printing colors are also called color separations. The printing originals are scanned as a rule and are exposed onto the printing plates by way of an exposer. Previously, the exposure of film was also provided as an intermediate step.

Today, the page description languages Post Script (PS) and PDF (portable document format) are largely used as data formats for describing the printing originals. In order to generate the image data, the separated printing originals are scanned in a raster image processor (RIP) and are converted into a corresponding matrix or bitmap. In this case, the individual pixels which correspond to the exposer resolution are each assigned a value as a function of the gray value which is to be achieved. This assignment generally takes place on the basis of a range of threshold values. For example, a raster cell can be assigned a number of pixels. Depending on the gray value of the corresponding printing original, a number of pixels which is associated with this gray value is exposed and in this way a raster dot which corresponds to the gray value is set as an image. For this purpose, the image data assume values 0 or 1, depending on whether or not the pixels have an image set.

A plurality of exposed pixels or raster dots on a printing plate represents a corresponding image point and, as a function of the number of exposed points, a gray value is represented which corresponds to the gray value of the original image point of the printing original.

A change in the actual tonal value which is printed onto the printing substrate by the printing press occurs as a function of the tonal value which is to be displayed, the printing plate exposer which is used and the printing press which is used. The inking zone screws are automatically set as a function of the expected tonal value increase and the corresponding parameters of the printing press and the printing plate exposer, in such a way that a tonal value which is as close as possible to the desired tonal value is produced on the resulting printing image on the printing substrate. Furthermore, the printer has the freedom to regulate the ink quantity through the inking zone controller in the individual inking zones in such a way that he or she can also regulate the ink density and the tonal values in boundaries within the inking zones after the exposure of the printing plates, according to his or her perception. A corresponding method for controlling the area coverage of a printing plate and the ink quantities in the printing press is disclosed in German Published, Non-Prosecuted Patent Application DE 102 01 918 A1, corresponding to U.S. Pat. No. 6,684,790, with reference being made in this case to the full scope of the latter.

Regulation of the quantitative supply of ink through the use of inking zone screws is not possible at all in the above-described printing presses without inking zones. The printer is therefore not given any possibilities of regulating the ink quantity in defined regions which can also correspond to inking zones and therefore of manipulating the printed ink density or the tonal value on the printing substrate. Manipulation of the ink densities over a region which is not identical with inking zones or which even extends transversely with respect to the latter is not possible, even in printing presses which have inking zones.

BRIEF SUMMARY OF THE INVENTION

It is accordingly an object of the invention to provide a method and a system for producing printing forms for anilox printing presses, which overcome the hereinafore-mentioned disadvantages of the heretofore-known methods and systems of this general type and with which it is possible for a printer to also manipulate ink density or tonal value in a resulting printing image on printing substrate after exposure of a first printing plate within a printing press, in particular a printing press without inking zones.

With the foregoing and other objects in view there is provided, in accordance with the invention, a method for producing at least one printing form for a printing process on a printing press. The method comprises producing a first printing form based on first image data, printing a printing image on a printing substrate with the printing form, generating correction values in vicinity of the printing press in regions, based on at least the printing image, using the correction values for correcting printing originals on which printing is based and/or screened image data, and producing at least one second printing form based on at least the correction values.

According to the circumstances, the correction values can, for example, be desired changes in the tonal values or ink densities in a defined region of the printing image. The correction values are used for correcting the printing originals which correspond to the colors in dependence on which colors are to have their separations adapted. It is, of course, also possible that it is not the printing originals which still have to be screened that are corrected, but directly the image data which have already been screened. In this case, this is then corrections of the individual raster cells or raster dots of the raster bitmap. Use of the method during repeated screening of the printing originals is also conceivable and should also be included according to the invention.

In accordance with another feature of the invention, in order to achieve operation which is as simple as possible for determining the required correction values, the printed printing image is advantageously displayed on a monitor and it is possible for regions to be marked and/or selected, for which correction values are to be generated.

In accordance with a further feature of the invention, for this purpose, for example, the printed printing image on the printing substrate can be scanned first of all and then displayed on a corresponding monitor. Correction values which correspond to the new tonal values or ink densities which are desired there can then be generated in the selected regions or in the marked regions.

Regions which are marked can, for example, be defined objects, such as houses or people, or positions within the printed printing image. Marking of this type can be input, for example, through a touch screen of the monitor or else can be generated through automatic detection of objects within the printing image.

In accordance with an added feature of the invention, the selectable regions are provided in the manner of zones which extend in the printing direction at least over the entire printing image. In this case, these zones can advantageously correspond to the inking zones which are known to the printer. They can then, for example, be 32.5 mm wide, and a change in the tonal values or ink densities in the individual inking zones can be performed by a printer in the manner which is known to him or her, such as for setting the inking zone screws. Instead of then setting inking zone screws, corresponding correction values are generated in this marked region.

In accordance with an additional feature of the invention, in order to provide the printer with the zones in a particularly simple manner, these selectable regions are provided on the monitor as structures which superimpose the displayed printing image. Apart from zones or inking zones which are provided as selectable regions, there can, of course, also be provision for interfaces within the printing image to be detected automatically and to be provided as correspondingly selectable regions.

In accordance with yet another feature of the invention, in order to further refine the selected correction, that is to say the correction values, the displayed printing image is divided into zones, and the zones are constructed from at least three bands which extend in the longitudinal direction over the entire printing image. As a result, a rough setting can be performed in the displayed zones first of all, and more precise correction values can be set for the individual bands. In this case, the correction values can act, in particular, simply always over the entire zone and additively over the corresponding bands. In this case, these bands can either be displayed or stored only for manipulation of the tonal values or ink densities.

In accordance with yet a further feature of the invention, in order to ensure that jumps do not occur within the tonal values or ink densities between the individual zones, the correction values are advantageously adapted band for band to the adjacent zones, so that an adapted profile of one zone to the adjacent zones results.

In accordance with yet an added feature of the invention, it is particularly advantageously possible for this profile to be set. An operator is therefore provided with a way in which he or she can achieve an optically attractive profile over the entire width of a printed sheet.

In accordance with yet an additional feature of the invention, alternatively the displayed printing image is divided in the longitudinal direction into adjacent segments. In this way, marking or selection of defined objects within the printing image is not limited to longitudinally oriented zones, but instead regions can be selected simply which lie within the printing image and are completely enclosed by an interface. In the case of corresponding marking or selection of a region of this type, all segments which lie within this region are then selected. For segments which lie only partially within this region, there can then be provision for corresponding correction values to be adapted to their proportion which lies in the boundary region.

In accordance with again another feature of the invention, all segments are therefore selected by corresponding marking and the correction values are generated for the selected segments. In this case, there is also advantageously provision for the correction values of the segments of the selected region toward the boundaries of the region to be adapted to the segments which adjoin it from the outside. This adaptation should also advantageously be capable of being set. In this case, in particular, there is also provision, additionally or as an alternative, for it also to be possible to set the width of the boundary region, in which a corresponding adaptation takes place. In this way, a particularly uniform profile from a selected object or region to the regions outside the selected object can be effected.

In accordance with again a further feature of the invention, it is possible for these correction values or correction data to be generated in the region of the printing press by a user. In order to produce adapted or corrected printing forms, there is then provision for these correction data to be transferred according to the invention to a raster image processor (RIP) or to a printing form production device. The printing originals or the screened image data can then be adapted through the transferred correction values in accordance with the stipulations of the user.

In accordance with again an added feature of the invention, in order to ensure that the user can detect which effect the corrections that are performed by him or her have on the printing image, the RIP or the printing form production device advantageously corrects the screened image data or the objects which are the basis of the image data in accordance with the correction values and then optionally transfers the corrected image data to the printing press again after screening, and an image of the corrected printing image is displayed on the basis of the corrected image data. This can take place, for example, in such a way that only the data for the marked region are corrected and transmitted back and then these corrected image data are placed over the displayed printing image. In this case, there can be provision, in particular, for it to be possible for different transparencies of the superimposed printing image to be set. A complete replacement of the displayed printing image at least in regions with the corrected image data can also occur. The user then has the possibility of seeing the results of his or her correction very quickly by the communication of the printing press with the printing form stage, that is to say with the RIP, or directly with the printing plate exposer. In particular, there can also of course be provision according to the invention for a further RIP to be provided in the region of the printing press at least for displaying the corrected data of the printing image. The RIP can be configured as hardware or as software.

In accordance with again an additional feature of the invention, if conventional inking zones are used within a printing press, it is possible for the printer to reduce or increase the provided ink quantity within predefined limits. In order to also make a corresponding feeling possible for increasing or reducing the ink quantity for the proposed printing units without inking zones, printing is carried out by way of overinking and a change in the inking of the printing substrate is always set through a correction of the screening during the printing form production of the at least subsequent second printing form. This overinking can be taken into consideration in this case during the production of the first printing form. An increase in the ink quantity can therefore also be realized through the screening by a correction of the screening during the production of the second printing form.

Overall, changes to the printed printing image which are carried out on the printing press can be correction values which are either absolute values of individual image points or raster dots, or correction values can be generated which represent the relative changes of defined image points or raster dots. These values can then be transmitted back to the preprinting stage by the printing press and can be used there to produce a further printing form.

In accordance with still another feature of the invention, the printing process is an anilox printing process. The proposed method can be used particularly favorably for producing printing forms in this printing process without inking zones.

In accordance with still a further feature of the invention, the printing form is a printing plate and a printing plate exposer which is separate from the printing press is used as the printing form production device. It is then not important, at which location the printing plate exposer is situated. The printing image can then be processed directly on the printing press, the generated correction values are sent back to the preprinting stage, that is to say they are transmitted to the printing plate exposer, and it is not particularly necessary to provide this printing plate exposer in the vicinity of the printing press. High flexibility is therefore achieved.

In accordance with still an added feature of the invention, in order to take into consideration, during the printing form production, properties of the printing press itself which can lead to deviating tonal values or ink densities on the printing substrate, first of all a printing form is produced on which defined test shapes are provided. These test shapes should advantageously have control wedges which are each assigned to one region. This type of region of the printing form can, for example, be an above-described zonal region. Irregularities in the inking and/or an increase in tonal value can be detected locally in regions during the printing of the printing substrate through these control wedges. Correction values can then be produced by using these determined irregularities and the correction values can be transmitted from the printing press to the RIP or the printing form production device, that is to say the printing plate exposer, and can then be taken into consideration at least during the production of the first printing form. This consideration can be effected in such a way that the corresponding local correction of the image data or the raster dots is already used during the production of the first printing form.

With the objects of the invention in view, there is concomitantly provided a printing system, comprising at least one printing press and a printing form production device for producing at least one printing form for a printing process on a printing press. A first printing form is produced on the basis of first image data, and a printing image is printed on the printing substrate by way of the printing form in order to carry out the method as it has been described above.

This printing system is distinguished by the fact that the printing press is a printing press without inking zones, for example an anilox, in particular an anilox printing press. Furthermore, a display screen is provided and the printed printing image is to be displayed on the display screen. Additionally, marking elements which are suitable for marking selected regions of the displayed printing image are provided in the printing system. Furthermore, switching elements should be provided for setting correction values within the regions which are marked in this way. In addition, the printing form production device should be a printing plate exposer, and the printing plate exposer and/or the printing press have a raster image processor (RIP). Return lines are to be provided for transmitting correction values from the printing press to the printing plate exposer and/or the RIP and back to the printing press. Furthermore, at least one confirmation element is to be provided in the region of the printing press for confirming a displayed corrected printing image and/or for starting the production of a printing form on the basis of the corrected printing image.

In this way, it is possible to carry out the method which is described further above by way of the printing system which is proposed herein.

Although the invention is illustrated and described herein as embodied in a method and a system for producing printing forms for anilox printing presses, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.

DETAILED DESCRIPTION OF THE INVENTION

Referring now to the figures of the drawings in detail and first, particularly, toFIG. 1thereof, there is seen a printing system according to the invention having an anilox printing press1which, in the case that is shown, has four printing units2. The printing units2do not have any inking zone screws and have only one short inking unit, in which the printing ink is transferred onto a printing plate cylinder5through an engraved roll. This is an embodiment of an anilox inking unit which is already known per se. A printing plate18, which is inked through the engraved roll, transfers a printing image201(indicated inFIG. 3) onto a sheet7through a blanket cylinder4. The sheet7is guided from a feeder stack6through the printing press1along a transport path and therefore passes into a press nip19which is formed by the blanket cylinder4and an impression cylinder3. The ink is transferred onto the sheet7in the press nip19. As described, the printing unit2should be an anilox unit. In this case, embodiments are possible, in which a dampening unit is provided or in which printing is to be carried out without water.

The printing press1which is shown herein is therefore a sheet-fed offset printing press.

The printing press can be controlled from an operating desk9through a communication line8. The operating desk9has a monitor12for supporting the control or for the control itself.

After a sheet7has been guided from the feeder stack6through the printing units2of the printing press1, the complete printing image201has been printed thereon. The printing image201can be detected by a corresponding detecting device. In the case which is shown herein, an external sheet scanner10is provided, on which a sample print of a sheet7can be placed and scanned. As an alternative, it is of course also possible to detect the sheet7within the printing press1by way of a corresponding scanning device.

The sheet scanner10is connected to the operating desk9through a transfer line11. In this way, all of the data of the printed sheet7can be transmitted from the sheet scanner10to the operating desk9and can be displayed there. This can take place, for example, on the monitor12. Overall, it is also possible for the monitor12per se to represent the operating desk9. It can be sufficiently large to display a complete sheet7and can be configured as a touchscreen. In this way, all inputs for controlling the machine can be carried out directly through the surface of the monitor12.

Firstly the printing press1can be operated from the operating desk9, and secondly corrections can be carried out on the printing image201, through the use of operating elements. Various operating elements204,205,206,302,303can be provided for this purpose, as is shown inFIGS. 3 and 4. The operating elements either can be provided as hardware on the operating desk9or can be displayed on the monitor12. Furthermore, a marking element17is provided in this case, by way of which defined regions on the printed sheet7that is displayed on the monitor12can be marked. Corrections can then be carried out in the marked regions through the operating elements204,205,206,302,303, and correction values can be set manually in this way. The correction values can then be transmitted to a raster image processor15(RIP) over a communication line13. In the case which is shown herein, the RIP15is associated with a printing plate exposer16. Furthermore, it is possible for the RIP to be integrated directly into the printing plate exposer16and/or provided as software on a computer. The RIP15makes image data available, by way of which the printing plate exposer16sets images on the printing plates18depending on the color separation. The printing originals which are assigned to the individual color separations can be adapted to the corrected values for the printing image201through the correction values which are transmitted to the RIP over the communication line13. The RIP15can produce new image data on the basis of the adapted printing originals. The image data can be transmitted back to the operating desk9over a communication line14and converted to the extent that corresponding changes in the resulting printing image201are shown on the monitor12. In this way, corrections which are carried out by the operating elements204,205,206,302,303and17, that is to say changes to the printing image201, can be displayed directly on the monitor12. If the changes which are produced in this way are satisfactory, that is to say if the displayed printing image201corresponds to the printing image which is desired by an operator, an OK can be given by a corresponding operating field and the RIP15can transmit the corresponding screened image data to the printing plate exposer16which produces new printing plates18for the individual printing units2on the basis of the image data which have been corrected in this way.

FIG. 2shows a corresponding sequence plan for the production of printing plates for an anilox printing press1.

Individual pages are composed from images and text within a non-illustrated upstream workflow. The individual pages are output by way of corresponding software to form printed sheets. The output sheets are stored as PDF files101. The PDF files101or postscript files (PS) are transmitted to the RIP15. Within the RIP15, the transmitted PDF files101are split into the corresponding printing originals of a color in accordance with the process colors which are used in the printing press1, that is to say into the corresponding color separations. The color separations are then screened individually within the RIP15, in order to generate the screened image data for the printing plate exposer16in this way. The screened image data represent a bitmap of the printing plate18which is to be exposed, with each possible exposer point being represented through a raster dot. A 0 or 1 is stored within the bitmap depending on whether or not the raster dot is to be exposed.

The image data which are generated in this way are transmitted to the printing plate exposer16. A printing plate18which corresponds to the corresponding process color has images set on it within the printing plate exposer16for each printing unit2of the printing press1. Possible further process steps for producing the printing plate18are not shown in this case for the sake of clarity.

The printing plates18which have been produced in this way are introduced into the individual printing units2of the anilox printing press1. First sheets7are printed during first printing of the anilox printing press1with the first printing plates18. The sheets7are subsequently scanned and evaluated in a sheet scanner10. The sheet scanner10can be provided externally from the printing press1or else it can be integrated into it.

The printing image201which is scanned image point by image point in this way is displayed on the monitor12of an operating desk9. As has already been described, defined regions or objects203can be marked or selected in this case and then corrected, that is to say changed, by the user in accordance with the stipulations. In this way, correction values102are generated which are transmitted back to the RIP15from the operating desk9. The RIP15then generates new image data on the basis of the corrected printing originals. New values for the image points of the printing image201which is displayed on the operating desk9can be determined on the basis of the image data. The corrected image points or the corrected image data can be transmitted to the operating desk9by the RIP15as corrected values103. Either within the RIP15or within the operating desk9, the image points which are to be displayed of the corrected printing image201are then calculated on the basis of the corrected image data and finally displayed on the monitor12of the operating desk9. If the newly displayed corrected image points of the printing image201meet the requirements of an operator, he or she can initiate the production of a new corrected printing plate18by the printing plate exposer16through a corresponding field on the operating desk9. Should the corrected printing image201which is then displayed not meet his or her expectations, he or she has the possibility of improving the adaptation of the printing image to his or her requirements through further correction steps. In this case, correction values102are transmitted repeatedly to the RIP15which transmits new corrected values103to the operating desk9on the basis thereof. It is only when an operator has confirmed the corrected printing image201that the RIP15is caused to transmit the corrected image data to the printing plate exposer16which then begins to set images on new printing plates18. In this case, it is possible, in particular, that should only correction values for individual color separations be present, only these corrected color separations are used for producing new printing plates18. The new printing plates18are again introduced into the printing press1, where they replace the original first printing plates18. Sheets7are once again printed which are then scanned online or offline by a sheet scanner10. The new printing images201which are generated in this way are again displayed on a monitor12of the operating desk9and, for the case where the printing image201which has been corrected in this way still does not meet the requirements of the user, it is possible according to the described method to produce a new printing plate18. Otherwise, a complete print job can be carried out in the printing press1by way of satisfactorily produced printing plates18.

FIG. 3shows one example for the possible correction of the printing image201in regions.

Part of the printed sheet7is shown in this case. The scanned printing image201is displayed on a monitor12of the operating desk9. In addition to the displayed printing image201, corresponding switching elements and slide regulators204,205are situated in this case within a correction selection range206. A selection can be made, for example, on the operating desk9as to which type of switching element and slide regulators are situated within the correction selection range206. In the case which is shown herein, the correction selection range206is a range for correcting the color balance. Accordingly, switching elements for brightness, high lights, medium tints and shadows are shown in this case. A corresponding selection through the switching elements204can be set more accurately through the slide regulators205. The setting through the slide regulators205or switching elements204is applied to a marked region within the displayed printing image201. This region can be selected directly on the monitor12through a marking element17. For this purpose, a marking202can be positioned on the displayed printing image201and an object203can be marked. In this case, in particular, further auxiliary devices are conceivable which make the selection of a defined object203easier, for example through the detection of interfaces. The marking element17can, for example, be a stylus or a pen, with which the monitor12can be acted on directly, or it can also be a non-illustrated trackball or a mouse, with which the monitor12can be acted on.

The changes which are made in the marked region in this way are again displayed on the monitor12, as described. This can be effected by a replacement of the originally displayed region or by a superimposition of the corrected region. For example, it is possible for certain colors, such as yellow, blue, green or magenta, to be reduced or increased. It is also possible for the brightness to be changed in the defined marked region. In particular, the entire printing image can also be considered as a marked region, if it is selected. Changes over the entire printing region are therefore also possible.

FIG. 4shows one example of defined selectable regions which can be selected in the region of the displayed printing image201. The selectable regions are positioned over the printing image201. In the case which is shown herein, they are inking zones301which have been placed over the entire scanned and displayed printing image201.

These inking zones301are zones which symbolically represent the inking zones of an offset printing press having inking zone adjusting elements. As a result, an operator can have the same feeling with the printing press without inking zones as if the inking zones which are known to him or her were actually present.

The individual inking zones301can be adapted to the requirements of an operator through inking zone regulators302which are either provided as mechanical regulators on the operating desk9or are made available virtually on the monitor12. Corresponding correction values for all image points which lie within the corresponding inking zone301are then generated and transmitted to the RIP15, depending on the setting and use of the inking zone regulators302. In the case which is shown herein, in addition to the displayed printing image201of the sheet7, a monitor display304also includes the inking zone regulators302and a further setting and changeover range303. In this case, further possible setting functions for the individual inking zones or inking zone regulators301,302can also be provided. For confirming a corrected printing image201or for starting production of a printing form based on the corrected printing image201a conformation element305is provided.

FIG. 5shows an illustration of an inking zone301, as is stored for generating correction values102. The inking zone301is divided into individual bands401and402. The bands cover the entire sheet7in the longitudinal direction and occupy only a fraction of an inking zone301transversely with respect to the former. In this case, the inking zone301can be constructed of bands401,402having different widths. The bands401in the edge regions of an inking zone301are preferably narrower than the bands402in the center region of an inking zone301. The correction values102are then not generated identically for the entire inking zone301by the final position through the inking zone regulator302, but instead modified correction values102are generated for the individual bands401,402. In this case, the correction values102for the bands401in the outer region of an inking zone301are adapted to the inking values of the adjacent inking zones301. In this case, this can, in particular, be an adaptation to inking values which have already been corrected for the adjacent inking zones301. The width of this adaptation region through the bands401can be set, in particular, through further non-illustrated selection regulators. A plurality of bands401can then be selected for the transition of the corrections of one inking zone301to an adjacent inking zone301.

In order to select a region, as has been shown inFIG. 3, the inking zones301can be split into different segments403. The segments can then be selected by the marking202, as has been shown inFIG. 3, depending on the setting, independently of the inking zones301. It is also possible in this case, although a uniform correction is carried out for all segments403of the marked object203through a corresponding slide regulator205, for the correction values102which are generated in this way to be modified themselves in the region of the marking202. This then results in different correction values102for the segments403which lie in the region of the marking202than for the segments403which lie within the object203. Furthermore, it is possible to define the number of segments403or their spacing from the marking202as adjustable parameters, with the result that a transition region from the correction of the marked object203to the remaining surrounding printing image201can be set. In particular, it is possible to set the adaptation itself, that is to say its extent or gradient, through non-illustrated regulators.

In this way, as a result of a communication of changes which are performed on the operating desk9with the RIP15of the preprinting stage, it is also possible to set changes on the resulting printing image201for an anilox printing press1. Those changes would otherwise only be possible through inking zones of a conventional offset printing press. In particular, even changes which are not possible even with a conventional offset printing press, can be carried out. In this case, the method could also be used for a conventional offset printing press. A printing plate18which has been newly produced in this way then meets the requirements of the user who has carried out the corresponding corrections directly on the printing press1on the basis of the sheets7which have already been printed and produced.