JP5517470B2 - Color control method for printing press and color control device for printing press - Google Patents

Description

  The present invention relates to a color control method for a printing press and a color control device for a printing press that can control the color tone of a printing press that uses a plurality of different colors of ink.

  Conventionally, it has been created in a PDL data creation process for creating PDL (Page Description Language) data, a plate making data creation process for creating plate making data based on the created PDL data, a PDL data creation process, and a plate making data creation process 2. Description of the Related Art A print management system including a printing process that performs printing based on image data is known (see, for example, Patent Document 1). In the PDL data creation process and the plate making data creation process of this print management system, representative points used for color tone management are set, and the image data is corrected so that the color tone of the representative points becomes the target color tone. . Also, in the printing process of the print management system, the ink supply amount is received so that the representative point information including the position information and color tone information of the representative point is received together with the created image data, and the color tone of the representative point becomes the target color tone. Is controlling.

JP 2004-171381 A

  By the way, process inks such as indigo (C), red (M), yellow (Y), and black (K) are used as inks used in the printing press, and the printing press appropriately sets the usage ratio of these inks. Various colors that are difficult to express with process ink (so-called special colors other than the primary colors of indigo (C), red (M), yellow (Y), and black (K)) are expressed by adjusting (controlling the color tone) It becomes possible to do. At this time, when the special color pattern is printed on the printing paper using the process ink with the process ink, the color tone of the special color picture printed on the printing paper changes in the width direction and the conveyance direction. There is a case.

  In this case, in the conventional print management system, control is performed so that the color tone of the representative point becomes the target color tone based on the representative point information including the position information of the representative point and the color tone information. However, although the color tone of the representative point becomes the target color tone, the color tone other than the representative point does not necessarily become the target color tone. That is, when the color tone changes in the width direction and the conveyance direction in the special color pattern, it is conceivable that the change in the color tone of the entire special color pattern is not eliminated even if the color tone of the representative point becomes the target color tone.

  In Patent Document 1, it is described that the representative point may be set for each ink key area of the printing press. As the representative point increases, the change in the color tone of the special color picture is eliminated. Setting a plurality of points is a cumbersome operation for the operator.

  Accordingly, the present invention provides a color tone control method for a printing press and a color tone control device for a printing press that can control the color tone so that a special color pattern has a desired color tone using a plurality of different ink colors. Let it be an issue.

  A color tone control method for a printing press according to the present invention is a color tone control method for a printing press capable of reproducing a spot color by using a plurality of different colors of ink, and is made by plate making data generated based on a print layout including a spot color pattern A spot color information acquisition step for acquiring spot color information including color information and arrangement information regarding the spot color pattern, a spot color pattern setting step for setting a spot color pattern corresponding to the acquired spot color information as a color tone control target pattern, and a color tone control target pattern And a color tone control step for controlling the special color picture set as a predetermined color tone.

  According to the above configuration, it is possible to control the color tone of the special color pattern to be a predetermined color tone based on the special color information. As a result, the color tone control can be performed in units of the special color picture, so that the occurrence of a change in the color tone of the special color picture can be suppressed by simple control.

  In this case, the color tone control step detects the color tone of the special color picture printed on the printing surface, and varies the supply amount of the plurality of types of inks based on the detected color tone of the special color picture, thereby changing the color tone of the special color picture. Is preferably controlled.

  According to the above configuration, the ink supply amount can be variably controlled based on the color tone of the special color pattern after printing, whereby the color tone of the special color pattern can be set to a suitable color tone.

  In this case, in the spot color information acquisition step, a plurality of spot color information can be acquired. The spot color information acquisition step further includes a priority order giving step for assigning priorities to the plurality of spot color information. It is preferable to control the color tone of a plurality of special color patterns based on the priority order given in the process.

  According to the above configuration, when there are a plurality of special color patterns, the color tone of the special color pattern can be controlled based on the priority order. For this reason, the color tone of the special color pattern having the higher priority can be set to a suitable color tone.

  In this case, the spot color information includes the pattern information related to the spot color pattern. In the priority order assigning step, the priority order is assigned to the plurality of spot color information based on at least one of the pattern information, the color information, and the arrangement information. Is preferred.

  According to said structure, a priority can be provided with respect to several spot color information based on design information, color information, and arrangement | positioning information. Accordingly, it is possible to preferentially control the color tone of a special color pattern that should have a suitable color tone in consideration of various parameters relating to the special color pattern.

  Further, in this case, the pattern information includes information related to the total amount of the pattern area ratio of the special color pattern, and in the priority order assigning step, it is preferable to assign the priority order in descending order of the total amount of the pattern area ratio.

  According to said structure, a priority can be provided in an order from a thing with the largest total amount of a pattern area rate. Thereby, it is possible to preferentially control the color tone of a special color pattern having a large total amount of the pattern area ratio. That is, color tone control is preferentially performed when the special color pattern is solid.

  Further, in this case, in the color tone control step, the ink supply amount is varied for each of the plurality of ink keys provided in the printing press, and for the plurality of ink key zones set on the printing surface corresponding to the plurality of ink keys, When a plurality of special color pictures are set, in the color tone control step, it is preferable to control the same kind of special color pictures to have the same color among the plurality of special color pictures.

  According to said structure, when the same kind of special color picture is arrange | positioned in a different ink key zone, color tone control can be performed so that the color tone of the same kind special color picture may become the same color. Thereby, in the same kind of special color pattern, it does not become a different color tone and can be made to look good.

  Also, in this case, in the special color pattern setting process, it is possible to set a pattern other than the special color pattern as the color tone control attention pattern, and a special color pattern and a pattern other than the special color pattern are set for the same ink key zone. In the setting step, when a special color pattern and a pattern other than the special color pattern are set as the color tone control attention pattern, it is preferable that the color tone control step controls the special color pattern so as to give a predetermined color tone.

  According to the above configuration, even when a special color pattern and a pattern other than the special color pattern are set as color tone control attention patterns for the same ink key zone, the special color pattern can be preferentially color-tone controlled. it can.

  The color tone control device for a printing press according to the present invention is a color tone control device for a printing press capable of reproducing a spot color using a plurality of types of different color inks, and the plate making data generated based on the print layout including the spot color pattern From the spot color information acquisition means that can acquire the spot color information including the color information and arrangement information about the spot color picture, the spot color picture setting means that sets the spot color picture corresponding to the acquired spot color information as the color tone control attention picture, and the plate making data Based on the color tone detection means capable of detecting the color tone of the printed surface printed using the printing plate produced based on the color plate, and the special color pattern set as the color tone control attention pattern based on the detected color tone of the printed surface is a predetermined color tone. And a color tone control means for controlling the ink supply amount.

  According to the above configuration, the color tone of the special color picture can be controlled to be a predetermined color tone by variably controlling the ink supply amount based on the color tone of the special color picture after printing. As a result, the color tone control can be performed in units of the special color picture, so that the occurrence of a change in the color tone of the special color picture can be suppressed by simple control.

  According to the above-described color tone control method of a printing press and the configuration of the color tone control device of a printing press, it is possible to make a special color picture have a desired color tone by using a plurality of different ink colors.

FIG. 1 is a schematic diagram of a color tone control apparatus according to the present embodiment. FIG. 2 is an explanatory diagram showing a printing plate produced based on the plate making data and image data generated based on the plate making data. FIG. 3 is an arrangement diagram of the special color pattern in the first arrangement pattern. FIG. 4 is an arrangement diagram of the special color pattern in the second arrangement pattern. FIG. 5 is an arrangement diagram of the special color pattern in the third arrangement pattern. FIG. 6 is a series of flowcharts relating to the color tone control of the color tone control apparatus. FIG. 7 is a series of flowcharts regarding priority determination of the color tone control apparatus. FIG. 8 is a schematic diagram relating to the plate making image preview screen. FIG. 9 is a schematic diagram relating to a prepress image enlargement screen.

  Hereinafter, a color tone control device and a color tone control method for a printing press according to the present invention will be described with reference to the accompanying drawings. The present invention is not limited to the following examples. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  The color tone control device 50 in this embodiment is incorporated in, for example, a newspaper offset rotary printing press 1, and the rotary printing press 1 folds a plurality of webs W that are printed and overlaid to create a fold. .

  As shown in FIG. 1, the rotary printing press 1 includes a printing device 5 that performs printing on a web W that is fed from a paper feeding device (not shown), and can perform predetermined printing on the fed web W. it can. The printing device 5 is composed of, for example, a multi-color printing device that performs four-sided four-color printing, and four types of indigo (C), red (M), yellow (Y), and black (K) ink that are process inks. And four printing units 10a, 10b, 10c, and 10d are provided so as to correspond to the four types of inks.

  The four printing units 10a, 10b, 10c, and 10d are arranged in the order of the indigo printing unit 10a, the red printing unit 10b, the yellow printing unit 10c, and the black printing unit 10d from the upstream side in the conveyance direction of the web W. It is installed. The arrangement order of the printing units 10a, 10b, 10c, and 10d is not limited to this, and may be a desired arrangement order. Each of the printing units 10a, 10b, 10c, and 10d is configured to be able to print on the front and back surfaces of the web W at the same time. Then, the web W is printed by each of the printing units 10a, 10b, 10c, and 10d, so that desired printing is performed on both sides of the web W after printing.

  Each printing unit 10a, 10b, 10c, 10d includes a pair of blanket cylinders 15a, 15b, 15c, 15d facing each other across the web W, and a pair of plate cylinders 16a contacting the blanket cylinders 15a, 15b, 15c, 15d. , 16b, 16c, 16d and ink supply units 17a, 17b, 17c, 17d for supplying ink to the plate cylinders 16a, 16b, 16c, 16d. At this time, the pair of blanket cylinders 15a in the indigo printing unit 10a and the pair of blanket cylinders 15b in the red printing unit 10b are arranged close to each other, and the pair of blanket cylinders 15c in the yellow printing unit 10c and the black ink A pair of blanket cylinders 15d in the printing unit 10d are arranged close to each other.

  Each plate cylinder 16a, 16b, 16c, 16d is wound with a printing plate 25 (see FIG. 2) for transferring each ink to each blanket cylinder 15a, 15b, 15c, 15d. It is manufactured based on plate making data D described later.

  Each ink supply part 17a, 17b, 17c, 17d has an ink fountain 20 for storing ink and an ink source roller 21 for feeding ink from the ink fountain 20. A plurality of ink keys 22 for adjusting the width of the web W are provided. Although the details will be described later, the plurality of ink keys 22 are connected to the pattern control device 55, and the pattern control device 55 controls each ink key 22 to adjust the amount of ink supplied to the web W. It is possible to control the color tone of the printed image.

  Accordingly, when the web W is introduced into the printing apparatus 5 of the rotary printing press 1, the inks of indigo, red, yellow, and black (CMYK ink) are applied to both sides of the web W by the printing units 10a, 10b, 10c, and 10d. As a result, the web W is printed.

  By the way, the process ink such as CMYK color ink is used as the ink used in the rotary printing machine 1, and the rotary printing machine 1 appropriately adjusts the use ratio of these inks (performs color tone control). It is possible to express various colors that are difficult to express with process inks, so-called special colors.

  Here, when printing on the web W by the rotary printing press 1, it is necessary to create the printing plate 25 based on the plate making data D. Hereinafter, with reference to FIG. 2, a series of flows relating to the production of the printing plate 25 wound around the blanket cylinders 15a, 15b, 15c, and 15d will be briefly described.

  In creating the printing plate 25, first, a desired printing layout is created, and plate making data D is generated based on the created printing layout. As shown in FIG. 2, as the plate making data D, for example, a CMYK color pattern 30 having a “tree” shape, a first special color pattern 31a having a “cross” shape, and a second shape having a “circle” shape. When configured with the special color picture 31b, the color of the plate making data D is divided into CMYK colors, and four printing plates 25 of CMYK colors are produced based on the divided CMYK colors. At this time, from the plate making data D, the image data G of the CMYK color pattern 30 for controlling the color tone of the print image printed on the web W, the image data H1 (spot color information) and the second spot color of the first spot color pattern 31a. Image data H2 (spot color information) of the pattern 31b is generated. It should be noted that the image data G of the CMYK color pattern 30 also retains image data obtained by separating the special color patterns 31a and 31b into CMYK colors.

  Then, the produced CMYK color printing plates 25 are wound around the corresponding plate cylinders 16a, 16b, 16c, and 16d, so that the CMYK color picture 30, the first special color picture 31a, and the second special color picture are applied to the web W. 31b can be printed as a print image.

  However, during printing, the color tone of these patterns 30, 31a, 31b changes due to changes in printing conditions such as the nature of the ink used, the amount of dampening water supplied to the plate cylinder, and the paper quality of the web W. There is a case. For this reason, the rotary printing press 1 incorporates a color tone control device 50 for controlling the color tone of the pattern. Hereinafter, the color tone control device 50 will be described with reference to FIG. 1 again.

  The color tone control device 50 is based on a pattern control device 55 (color tone control means) capable of controlling the amount of ink supplied by the plurality of ink keys 22 provided in each printing unit 10a, 10b, 10c, 10d, and the plate making data D. An image data storage unit 56 that stores the generated image data G, H1, and H2 of the patterns 30, 31a, and 31b, and a pair of image sensors 57 (color tone detection means) that detect a print image printed on the web W. And an operation panel 58 for operating the pattern control device 55.

  The pair of image sensors 57 are arranged on the exit side of the printing apparatus 5 so as to face each other with the web W interposed therebetween. The pair of image sensors 57 is connected to the pattern control device 55, takes a print image printed on the web W, converts it into data, and outputs it as image data of the print image to the pattern control device 55.

  The picture control device 55 receives the image data G, H1, H2 of the pictures 30, 31a, 31b, and the picture control device 55 receives the input image data G, H1, H2 of the pictures 30, 31a, 31b. Are stored in the image data storage unit 56. That is, the pattern control device 55 functions as an image data acquisition unit (spot color information acquisition unit) that acquires image data of the patterns 30, 31a, and 31b.

  The picture control device 55 sets the image data H1, H2 related to the special color pictures 31a, 31b among the image data G, H1, H2 stored in the image data storage unit 56 as the color tone control attention picture, and the special color. It also functions as a picture setting means. Then, the picture control device 55 determines the color tone of the print image based on the image data H1 and H2 of the special color pictures 31a and 31b set as the color tone control attention picture and the image data of the print image obtained from the image sensor 57. Color tone control is performed so that the color tone of the special color pattern is the same. Note that among the image data G, H1, and H2 stored in the image data storage unit 56, there are a plurality of types of image data H1 and H2 related to the special color patterns 31a and 31b (for example, the first special color pattern 31a and the second special color pattern 31b). ) In some cases, the picture control device 55 gives priority to the image data H1 and H2 of the plural kinds of special color pictures 31a and 31b, and gives priority to the color tone of the special color pictures 31a and 31b which are higher in the given priority order. Tone control.

  Furthermore, the pattern control device 55 controls the plurality of ink keys 22 of each ink fountain 20, thereby adjusting the color tone of each of the patterns 30, 31a, 31b arranged in the plurality of ink key zones Z corresponding to the plurality of ink keys 22. It is possible to control. That is, as shown in FIG. 3, the picture control device 55 applies the plurality of (for example, eight in this embodiment) ink key zones Z to the image data G, H1, H2 of the pictures 30, 31a, 31b. The plurality of ink key zones Z are set so as to extend in the conveyance direction of the web W and are set side by side in the width direction of the web W. In FIG. 3, the image data H1 of the first special color picture 31a and the image data H2 of the second special color picture 31b are overlaid.

  As described above, the image data storage unit 56 stores the image data G, H1, and H2 of the patterns 30, 31a, and 31b. The stored image data G, H1, and H2 of each of the patterns 30, 31a, and 31b includes color information, arrangement information, and pattern information of each of the patterns 30, 31a, and 31b. Also, the pattern information is, for example, the total amount of the pattern area ratio in the special color pattern. At this time, the image data storage unit 56 stores image data for the number of signature pages created by the rotary printing press 1.

  The operation panel 58 is for operating the pattern control device 55, and is constituted by, for example, a touch panel or a personal computer, and various operation screens are displayed on the display unit.

  Therefore, when the image data of the print image is input to the design control device 55 by the image sensor 57, the color control device 55 receives the image data H1 of the special color designs 31a and 31b. , H2 to control the color tone of each of the special color pictures 31a, 31b by controlling the plurality of ink keys 22 of each ink fountain 20 based on the priority order.

  Here, with reference to FIGS. 3 to 5, the priority order of the special color pictures 31a and 31b given by the picture control device 55 and the color tone control by the picture control device 55 based on the given priority will be described.

  When giving priority to the first special color picture 31a and the second special color picture 31b, the total amount of the pattern area ratios of both the special color pictures 31a and 31b is determined from the picture information in the image data H1 and H2 of the both special color pictures 31a and 31b. In comparison, those with a large total amount (for example, solid printing) are given higher priority, and those with a small total amount (for example, halftone printing) are given lower priority. The priority order is not limited to this method. For example, the positions of both spot color pictures 31a and 31b are compared from the arrangement information in the image data H1 and H2 of both spot color pictures 31a and 31b, and the upstream side in the transport direction. It is also possible to place a position higher in the priority order and a position located downstream in the transport direction as a lower priority order. Further, for example, from the color information in the image data H1 and H2 of both the special color patterns 31a and 31b, the color tones of both the special color patterns 31a and 31b are compared, the color tone that is easy to express is given higher priority, and the color tone that is difficult to express is given priority. It may be a lower rank. Further, for example, the number of patterns of the first special color pattern 31a and the number of patterns of the second special color pattern 31b are compared, and those having a large number of patterns are given higher priority and those having a small number of pictures are given lower priority. Good. Therefore, the priority order of the special color pictures 31a and 31b provided by the picture control device 55 may be set based on at least the color information, the arrangement information, and the picture information, and the priority order may be set manually. .

  Here, the color tone control in the case where the first special color pattern 31a and the second special color pattern 31b are the first arrangement pattern shown in FIG. 3 will be described. The pattern control device 55 sets the plurality of ink key zones Z described above for the image data G, H1, and H2 of the patterns 30, 31a, and 31b, and among the eight ink key zones Z, the sixth ink key zone Z is set. The first special color picture 31a and the second special color picture 31b are arranged across the seventh ink key zone Z and the eighth ink key zone Z.

  In this case, since the first spot color pattern 31a and the second spot color pattern 31b are arranged in each ink key zone Z, for example, the priority order of the first spot color pattern 31a is higher, and the priority order of the second spot color pattern 31b is lower. When set, the picture control device 55 preferentially controls the color tone of the first special color picture 31a as compared with the second special color picture 31b.

  On the other hand, in the case of the second arrangement pattern shown in FIG. 4, that is, the second special color pattern 31b is arranged in the second ink key zone Z and the third ink key zone Z, and the sixth ink key zone Z and the seventh ink key are arranged. When the first special color pattern 31a is disposed across the zone Z and the eighth ink key zone Z, the first special color pattern 31a and the second special color pattern 31b are disposed in different ink key zones Z. The priority order is not given to the second spot color pattern 31b. For this reason, the picture control device 55 can individually control the color tone for the first special color picture 31a and the second special color picture 31b.

  Finally, in the case of the third arrangement pattern shown in FIG. 5, the second special color pattern 31b is arranged in the second ink key zone Z and the third ink key zone Z, and the sixth ink key zone Z and the seventh ink key zone are arranged. A first special color picture 31a and a second special color picture 31b are arranged across Z and the eighth ink key zone Z. In this case, since the first special color pattern 31a and the second special color pattern 31b are arranged in the sixth ink key zone Z, the seventh ink key zone Z, and the eighth ink key zone Z, for example, the priority order of the first special color pattern 31a is higher. When the priority order of the second special color picture 31b is set as lower, the picture control device 55 compares the second special color picture 31b with the second special color picture 31b in the sixth ink key zone Z, the seventh ink key zone Z, and the eighth ink key zone Z. The first special color pattern 31a is preferentially color-tone controlled. On the other hand, in the picture control device 55, the second special color picture 31b in the second ink key zone Z and the third ink key zone Z is changed to the second special color picture 31b in the sixth ink key zone Z, the seventh ink key zone Z and the eighth ink key zone Z. Color tone control is performed so that the color becomes the same. Thereby, the pattern control apparatus 55 can make the color of the 2nd special color picture 31b which is the same kind into the same color.

  Next, with reference to FIG. 6, a series of control regarding the color tone control of the color tone control apparatus 50 will be described, and with reference to FIG. 7, a series of control regarding the priority determination of the color tone control apparatus 50 will be described.

  First, referring to FIG. 6, when the image data G, H1, and H2 of the designs 30, 31a, and 31b are stored in the image data storage unit 56 via the design control device 55, the design control device 55 It is determined whether or not the image data G, H1, H2 of the pictures 30, 31a, 31b includes the image data of the special color pictures 31a, 31b (S1: special color information acquisition step). Next, when it is determined that there are the special color pictures 31a and 31b, the picture control device 55 gives priority to the color tone control of the special color pictures 31a and 31b or the color tone control of the CMYK color picture 30 to the operator. Is selected by the operation panel 58 (S2). Subsequently, when priority is given to the color tone control of the special color patterns 31a and 31b, the pattern control device 55 acquires color information, arrangement information, and pattern information from the image data H1 and H2 of the special color patterns 31a and 31b (S3). Priorities are assigned based on the various types of information (S4: priority assignment step). Then, the picture control device 55 sets the special color pictures 31a and 31b as color tone control attention pictures based on the assigned priority (S5: special color picture setting step). Thereafter, the picture control device 55 performs color tone control so that the image data of the print image detected by the image sensor 57 has the same color as the image data H1 and H2 of the special color pictures 31a and 31b (S6: color tone control step). . If it is determined in S1 that there is no image data H1 or H2 of the special color patterns 31a and 31b, or if it is selected in S2 that priority is given to the tone control of the CMYK color pattern 30, the pattern control device 55 in S7. Thus, the color tone control of the CMYK color picture 30 is performed.

  Next, with reference to FIG. 7, the priority determination of the color tone control device 50 will be specifically described. As described above, the image data storage unit 56 stores image data corresponding to the number of pages of signatures created by the rotary printing press 1, and the pattern control device 55 is a special color used in the signatures. It is determined whether there are a plurality of patterns 31 (S11). Next, when it is determined that there are a plurality of special color patterns 31, the pattern control device 55 gives the operator the priority order of the special color patterns 31 in units of signatures, or the spot color patterns 31 in units of signatures. The operation panel 58 is used to select whether to give the priority order (S12). Here, when it is selected that the priority order of the special color picture 31 is given in units of signatures, the picture control device 55 sequentially starts from the special color picture 31 on the upstream side in the transport direction based on the arrangement information of the special color pictures 31 in the signature unit. Whether or not to give priority is selected by the operation panel 58 (S13). Subsequently, when it is selected that the priority order based on the arrangement information is not given, the picture control device 55 gives the priority order in descending order of the number of the special color picture 31 or the pattern area ratio of the special color picture 31 Priorities are assigned in descending order of the total amount (S14).

  On the other hand, in S12, when it is selected that the priority order of the special color picture is given in units of signature pages, the picture control device 55 is on the upstream side in the transport direction based on the arrangement information of the special color pictures 31 in page units of signature. The operation panel 58 is used to select whether or not the priority order is given in order from the spot color pattern 31 (S15). Subsequently, when it is selected not to assign the priority order based on the arrangement information, the picture control device 55 assigns the priority order in descending order of the number of ink key zones occupied by the special color picture 31, or the picture of the special color picture 31. Priorities are assigned in descending order of the total area ratio (S16).

  If it is determined in S11 that there is one special color picture 31, and if it is selected in S13 that priority is given based on the arrangement information, the picture control device 55 will display the special color picture in eclectic units. Based on the arrangement information 31, priority is given in order from the special color pattern 31 on the upstream side in the transport direction (S 17).

  In S15, when it is selected that the priority order is given based on the arrangement information, the picture control device 55 uses the special color picture 31 on the upstream side in the transport direction based on the arrangement information of the special color picture 31 in the page unit of eclectic. Priorities are assigned in order (S18).

  Next, an operation screen displayed on the operation panel 58 will be described with reference to FIGS. 8 and 9. On the operation screen of the operation panel 58, it is displayed that the special color picture 31 is printed for each page of the signature created by the rotary printing press 1.

  For example, as shown in FIG. 8, on the plate-making image preview screen 60 on a predetermined page of eclectic, when a special color picture is printed, the fact that the special color picture is printed in the comment field 61 and the priority order of the special color picture Is displayed. Further, as shown in FIG. 9, on the plate making image enlargement screen 65, a border line 66 for emphasizing the border portion of the special color picture 31 is displayed so that the portion of the special color picture 31 can be easily visually recognized.

  According to the above configuration, the color tone control device 50 uses the color tone of the image data of the print image related to the special color pattern 31 detected by the image sensor 57 as the color tone of the image data H of the special color pattern 31 stored in the image data storage unit 56. Thus, by controlling the amount of ink supplied by the plurality of ink keys 22 of each ink fountain 20, the color tone of the special color picture 31 can be controlled. As a result, the color tone control device 50 can perform color tone control in units of the special color pattern 31, and thus can suppress the occurrence of a change in the color tone of the special color pattern 31 by simple control.

  In addition, when there are a plurality of spot color pictures 31, priority is given to the plurality of spot color pictures 31, and the color tone of the plurality of spot color pictures 31 can be controlled based on the given priority order. The special color picture 31 can be suitably controlled in color tone.

  Furthermore, even when one first special color pattern 31a and two second special color patterns 31b are in the third arrangement pattern, the color tone of the two second special color patterns 31b can be the same color, so that it looks good Can be good.

  In addition, although each ink supply part 17a, 17b, 17c, 17d in the present Example was comprised with the ink fountain 20 and the ink origin roller 21 which have the some ink key 22, it is not restricted to this, and it is ink from several nozzles. You may use the digital ink pump which can discharge. Further, in this embodiment, the priority order is given to the two types of special color pictures 31a and 31b. However, the priority order can also be applied to a plurality of kinds of special color pictures 31.

  As described above, the color tone control device and the color tone control method for a printing press according to the present invention are useful for a printing press using process ink, and are particularly suitable when incorporated in a newspaper offset rotary printing press.

DESCRIPTION OF SYMBOLS 1 Rotary printing machine 5 Printing apparatus 10a, 10b, 10c, 10d Printing unit 15a, 15b, 15c, 15d Blanket cylinder 16a, 16b, 16c, 16d Plate cylinder 17a, 17b, 17c, 17d Ink supply part 20 Inkwell 21 Ink source Roller 22 Ink key 25 Printing plate 30 CMYK color pattern 31a (31) First special color pattern (special color pattern)
31b (31) Second special color pattern (special color pattern)
50 color tone control device 55 picture control device 56 image data storage unit 57 image sensor 58 operation panel 60 plate making image preview screen 61 comment field 65 plate making image enlargement screen 66 border line W web D plate making data G CMYK color picture image data H1 first Special color image data H2 Second special color image data Z Ink key zone

Claims (8)

The spot color can be reproduced using a plurality of different colors of ink , and the image data of the spot color picture and the CMYK color picture are generated from the plate making data generated based on the print layout including the spot color picture and the CMYK color picture. Image data of each color is generated, color tone control of the special color picture is executed based on the generated image data of the special color picture, and the color of the CMYK color picture is determined based on the image data of each color of the CMYK color picture. A color tone control method for a printing press capable of executing color tone control ,
From the plate making data, a spot color information acquisition step of acquiring image data of the spot color pattern including color information and arrangement information related to the spot color pattern;
A spot color pattern setting step of setting the spot color pattern corresponding to the acquired image data of the spot color pattern as a color tone control target pattern;
A color tone control method for a printing press, comprising: a color tone control step for controlling the special color pattern set as the color tone control target pattern so as to have a predetermined color tone. In the color tone control step, the ink supply amount is varied for each of a plurality of ink keys provided in the printing press,
When the spot color pattern is set for a plurality of ink key zones set on the printing surface corresponding to the plurality of ink keys,
In the color tone control step, the color tone of the special color picture printed on the printing surface is detected, and the supply amount of the plurality of types of ink is varied for each of the plurality of ink keys based on the detected color tone of the special color picture. 2. The color tone control method for a printing press according to claim 1, wherein the color tone of the special color pattern is controlled to be the same color for each of the plurality of ink key zones . In the spot color information acquisition step, a plurality of image data of the spot color pattern can be acquired.
The image data of the spot color pattern of multiple, further comprising a prioritization step of applying a priority,
The color tone control method for a printing press according to claim 1 or 2, wherein, in the color tone control step, the color tone of the plurality of special color pictures is controlled based on the priority level given in the priority level giving step. . The image data of the special color pattern includes pattern information related to the special color pattern,
Claim in the prioritization process, at least the picture information, based on one of the color information and the arrangement information, characterized by prioritizing the image data of the spot color pattern of multiple 4. A color tone control method for a printing press according to item 3. The pattern information includes information on the total amount of the pattern area ratio of the special color pattern,
5. The color tone control method for a printing press according to claim 4, wherein, in the priority order assigning step, a higher priority order is assigned in descending order of the total amount of the pattern area ratio. Over the previous Symbol multiple of ink key zone, if the feature pattern has been set multiple,
In the color tone control step, said one of the plurality of spot color picture, the printing machine according to any one of claims 2 to 5, characterized in that for controlling to the color tone of the spot color picture of the same type and same color Tone control method. In the special color picture setting step, the CMYK color picture can be set as a color tone control attention picture,
When the special color pattern and the CMYK color pattern are set for the same ink key zone, and in the special color pattern setting step, the special color pattern and the CMYK color pattern are set as color tone control attention patterns,
7. The color tone control method for a printing press according to claim 6, wherein in the color tone control step, the special color pattern is preferentially controlled to have a predetermined color tone. The spot color can be reproduced using a plurality of different colors of ink , and the image data of the spot color picture and the CMYK color picture are generated from the plate making data generated based on the print layout including the spot color picture and the CMYK color picture. Image data of each color is generated, color tone control of the special color picture is executed based on the generated image data of the special color picture, and the color of the CMYK color picture is determined based on the image data of each color of the CMYK color picture. A color tone control device for a printing press capable of executing color tone control ,
From the plate making data, spot color information acquisition means capable of acquiring image data of the spot color pattern including color information and arrangement information related to the spot color pattern;
A spot color pattern setting means for setting the spot color pattern corresponding to the acquired image data of the spot color pattern as a tone control attention pattern;
A color tone detection means capable of detecting the color tone of a printing surface printed using a printing plate produced based on the plate making data;
Based on the detected color tone of the print surface, a color tone control means for controlling the ink supply amount in units of the special color pattern so that the special color pattern set as the color tone control target image has a predetermined color tone; A color tone control device for a printing press, comprising:

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