JP2019080210A - Image forming apparatus, image forming method, and image forming program - Google Patents

Abstract

To improve visibility of a variable image superimposed on a standard form by using a special color.SOLUTION: In a variable printing system 10, an image forming apparatus 100 comprises: an image forming unit that can form an image by using a special color material capable of reproducing a chromatic color and a color material capable of reproducing gray; a variable print processing unit that acquires common image data, variable image data, and attribute data associated with the variable image data, and adjusts the color tone including the brightness and chroma of the variable image data according to the attribute data; an image analysis unit that creates a Delaunay diagram with reproducible brightness and chroma with the image forming unit, and compares a background Delaunay triangle with a variable Delaunay triangle being a Delaunay triangle to which the adjusted color tone of the variable image belongs; and a color correction unit that, in response to determination that the background Delaunay triangle and the variable Delaunay triangle are the same, further corrects the adjusted color tone of the variable image to a color tone belonging to a Delaunay triangle different from the background Delaunay triangle.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image forming apparatus, an image forming method, and an image forming program, and more particularly to variable printing that extracts information from a database and performs variable printing with different contents one by one.

  2. Description of the Related Art In recent years, variable printing that extracts information from a database and performs variable printing with different contents one by one is becoming widespread. In variable printing, printing is performed by superimposing a fixed form as a background and a variable image automatically generated based on information extracted from a database. In variable printing, form data for forming a fixed form and color profiles applied to color conversion processing of variable data for forming a variable image may be different from each other. In this case, there is a problem that the fixed form and the variable image are printed in different color tones. For such a problem, for example, Patent Document 1 is for color conversion processing of variable data representing document data. It has become possible to select whether or not to apply the color profile specified in and to propose a technology that makes it possible to match the color tone of form data printed out and the color tone of variable data.

JP 2008-92312 A

  However, in the case of printing with a special color (custom color), a method for securing the visibility of the variable image superimposed on the fixed form has not been sufficiently studied.

  This invention is made in view of such a condition, and an object of the present invention is to provide art which improves visibility of a variable picture superimposed on a fixed form using a special feature.

  In the image forming apparatus of the present invention, an image forming portion capable of forming an image using a coloring material of a special color capable of reproducing a chromatic color and a coloring material capable of reproducing gray, and a common part of a plurality of image forming objects Acquiring common image data representing a common image, variable image data representing a variable image which is variable in the plurality of image formations, and attribute data linked to the variable image data, which are preset The variable print processing unit arranges the variable image in the common image in a common arrangement, and adjusts the color tone including the lightness and the saturation of the variable image data according to the attribute data, and the image forming unit can reproduce Generate a Delaunay diagram of various lightness and saturation, a background Delaunay triangle which is a Delaunay triangle to which the color tone of the common image belongs, and a fluctuation Delaunay triangle which is a Delaunay triangle to which the color tone of the adjusted fluctuation image belongs In order to judge whether the background Delaunay triangle and the variation Delaunay triangle are the same, an image analysis unit that compares the triangle with the triangle and determines whether the background Delaunay triangle and the variation Delaunay triangle are the same. In response, a color correction unit is further provided which corrects the tone of the adjusted variation image to a tone belonging to a Delaunay triangle different from the background Delaunay triangle.

  In the image forming method of the present invention, an image forming process capable of forming an image using a coloring material of a distinctive color capable of reproducing a chromatic color and a coloring material capable of reproducing gray, and a common part of a plurality of image forming objects Acquiring common image data representing a common image, variable image data representing a variable image which is variable in the plurality of image formations, and attribute data linked to the variable image data, which are preset The variable image processing step of arranging the variable image in the common image in the same arrangement and adjusting the color tone including the lightness and the saturation of the variable image data according to the attribute data; and reproducible by the image forming unit A Delaunay diagram of various lightness and saturation, and a variation that is a background Delaunay triangle that is a Delaunay triangle to which the color tone of the common image belongs and a Delaunay triangle that the color tone of the adjusted variation image belongs to In the image analysis step of comparing the background with Delaunay triangle and determining whether the background Delaunay triangle and the variation Delaunay triangle are identical or not, and determining that the background Delaunay triangle and the variation Delaunay triangle are identical Accordingly, the correction process further includes the step of correcting the adjusted color tone of the fluctuation image to a color tone belonging to the Delaunay triangle different from the background Delaunay triangle.

  The present invention is an image forming program for controlling an image forming apparatus having an image forming unit capable of forming an image using a color material of a special color capable of reproducing a chromatic color and a color material capable of reproducing gray. Common image data representing a common image that is a common part of a plurality of image formations, variable image data representing a variable image that is variable in the plurality of image formations, and the variable image data Variable printing that acquires attribute data, arranges the fluctuation image in the common image in a preset arrangement, and adjusts color tone including lightness and saturation of the variable image data according to the attribute data Processing unit; generating a Delaunay diagram of lightness and saturation reproducible by the image forming unit; and a background Delaunay triangle, which is a Delaunay triangle to which the color tone of the common image belongs, and the adjusted variation image An image analysis unit that compares the variation Delaunay triangle, which is the Delaunay triangle to which the color tone belongs, and determines whether the background Delaunay triangle and the variation Delaunay triangle are identical; the background Delaunay triangle and the variation Delaunay triangle The image forming apparatus functions as a color correction unit that corrects the color tone of the adjusted fluctuation image to a color tone belonging to the Delaunay triangle which is different from the background Delaunay triangle according to the determination that is the same.

  According to the present invention, it is possible to provide a technique for improving the visibility of a variable image superimposed on a fixed form using a feature.

It is a block diagram which shows the function structure of the variable printing system 10 which concerns on one Embodiment of this invention. 5 is a flowchart showing the contents of variable print processing according to an embodiment. It is a table showing the contents of the database used for variable printing processing concerning one embodiment. FIG. 6 is an explanatory view showing a print image and a color table to be corrected in variable printing processing according to an embodiment. 5 is a flowchart showing the contents of print execution processing according to an embodiment. It is a flowchart which shows the content of the color correction process which concerns on one Embodiment. It is an explanatory view showing the contents of color correction processing concerning one embodiment. It is an explanatory view showing the contents of color correction processing concerning one embodiment. FIG. 6 is an explanatory view showing a print image after correction of variable printing processing according to an embodiment. It is an explanatory view showing the contents of correction execution processing concerning a modification.

  Hereinafter, modes for carrying out the present invention (hereinafter, referred to as “embodiments”) will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a functional configuration of a variable printing system 10 according to an embodiment of the present invention. The variable printing system 10 includes an image forming apparatus 100 and a personal computer (PC) 200. The image forming apparatus 100 includes a control unit 110, an image reading unit 120, an image forming unit 130, a storage unit 140, and a communication interface unit 150 (also called a communication I / F unit).

  The control unit 110 includes a variable print processing unit 111, an image analysis unit 112, and an image processing unit 113. The image forming unit 130 includes a color conversion processing unit 131 and a halftone processing unit 132. The image forming unit 130 can form an image using not only CMYK process colors but also special colors (custom colors) capable of reproducing chromatic colors. The personal computer 200 is connected to the image forming apparatus 100 using the communication interface unit 150.

  The control unit 110 includes a main storage unit such as a RAM and a ROM, and a control unit such as an MPU (Micro Processing Unit) and a CPU (Central Processing Unit). The control unit 110 also has a controller function related to interfaces such as various I / Os, USB (Universal Serial Bus), buses, and other hardware, and controls the entire image forming apparatus 100.

  The storage unit 140 is a storage device such as a hard disk drive or a flash memory, which is a non-temporary recording medium, and stores control programs (including an image forming program) and data of processing executed by the control unit 110. The storage unit 140 further stores a print target database 141, a color table database 142, and a spot color LUT (look-up table) 143.

  FIG. 2 is a flowchart showing the contents of the variable printing process according to an embodiment. FIG. 3 is a table showing the contents of a database used for variable printing processing according to one embodiment. FIG. 4 is an explanatory view showing a print image VP formed by variable printing processing according to an embodiment and a color table. In the variable printing process according to the present embodiment, the variable printing system 10 displays four variable images A1 to A4 superimposed on the fixed form B as an example. The variable printing process can print using spot colors (eg, custom red).

  The columns of the print target database 141 include division areas, sales / closing, recommended products, prices and evaluations. The divided areas indicate positions for displaying the variable images A1 to A4 superimposed on the fixed form B. Sales / Close shows whether the restaurant is open or closed. The recommended product indicates the product name of the product recommended by the restaurant. The price indicates the price of the recommended product.

  Evaluation shows the score of the evaluation as a quantitative result collected by the web server (not shown) on the internet. The variable print processing unit 111 periodically uses the communication interface unit 150 to acquire data representing an evaluation from a web server (not shown) and updates the print target database 141.

  In the present embodiment, the division area is any of the areas A to D for each record based on the number of display areas of the variable image (four in this example) arranged on the fixed form B and the number of evaluations. Is automatically set. Specifically, a variable image with the highest evaluation score is placed in the upper left area A, and a variable image with the lowest evaluation score (in this example, not covered) is automatically placed in the lower right area D. Is set. In this example, the division area is automatically set in accordance with the result of layout setting (step S200) described later.

  The print target database 141 stores common image data representing an image of the fixed form B and variable image data representing a variable image. The common image data is image data representing a common image which is a common part of a plurality of printed materials. The variable image data is image data representing a variable image that can change in a plurality of printed materials. In the present embodiment, the variable printing system 10 automatically generates print data using common image data and variable image data. Printed matter is also referred to as an image-forming material.

  In step S100, the user executes data table creation processing on the personal computer 200. In the data table creation process, the user sets each column of the database, and registers each store (a restaurant in this example) as a database record. As a result, the print target database 141 is generated. The image forming apparatus 100 periodically accesses a web server (not shown) to synchronize evaluation scores. Thus, the print target database 141 is updated.

  In step S200, the user executes layout setting processing on the personal computer 200. In the layout setting process, the user selects a fixed form, and sets the number and size of variable images to be superimposed and displayed on the fixed form.

  In this example, the user selects the fixed form B, and sets four variable images A1 to A4 to be displayed at predetermined sizes and positions. In the present embodiment, the variable images A1 to A4 are illustrations that are achromatic and are composed of a plurality of tones.

  In step S300, the user executes color determination processing on the personal computer 200. In the color determination process according to the present embodiment, the user can determine the hue of the background dominant color that is the dominant color (also referred to as a dominant color) of the fixed form B by selecting the special color. In this example, it is assumed that it is set to a custom red (CR) hue.

  The dominant color scheme is a method for achieving a sense of unity in overall hue, and is a scheme for changing the color tone in the same or similar hue. The color tones include pure, pure, neutral and achromatic.

  A pure color is a very high saturation and vivid tone. There are two types of clear colors: clear and bright colors obtained by mixing white (special color) with pure colors and dark and clear colors obtained by mixing black (K) with pure colors. The neutral color is a turbid color produced by adding gray (a composite of K or CMY) to the pure color. Achromatic colors are desaturated white, gray and black. The special color LUT (look-up table) 143 stores, at each grid point, gradation data of CMYKCR, saturation data and luminance data as characteristic data of custom red (CR) which is a special color. The spot color LUT 143 is used for color conversion and color correction.

  In step S400, the user instructs print execution processing on the personal computer 200. The image forming apparatus 100 starts the print execution process in response to an instruction of the print execution process from the personal computer 200.

  FIG. 5 is a flowchart showing the contents of the print execution process (step S400) according to the embodiment. In step S410, the variable print processing unit 111 executes data acquisition processing. In the data acquisition process, the variable print processing unit 111 reads the record of each shop from the print target database 141 as the shop database of the restaurant and acquires data to be used for variable printing.

  In step S420, the variable print processing unit 111 executes color table storage processing. In the color table storage process, the variable print processing unit 111 selects a color table from the color table database 142 (see FIG. 1 and FIG. 4B) based on the numerical value of the evaluation of each record of the print target database 141. Each record is linked and stored in a memory (not shown). The numerical value of evaluation is attribute data of each record and is linked to each record.

  Specifically, the variable print processing unit 111 links the record of store number 001 and stores the color table Y of 30% Eco corresponding to evaluation 3.5 in a memory (not shown). Save the Eco 60% color table X corresponding to the rating 1.9 in the memory (not shown) by tying it to a record, tying it to the record with store number 003 and getting the eco 0% corresponding to the rating 4.2 A color table Z memory (not shown) is stored, and a gray color table W corresponding to a store number 004 record and not evaluated is stored in the memory (not shown).

  Eco 30% means printing that reduces the color material of the special color (custom red in this example) by 30%. Eco 60% means low saturation printing that reduces 60% of special color materials. Eco 0% means high saturation printing that does not reduce the special color material.

  As described above, in the present embodiment, the variable images A1 to A4 are quantitatively set such that the density of the color material of the special color becomes higher as the evaluation score is higher, that is, the evaluation is higher. Therefore, the variable images A1 to A4 are set so as to stand out in the fixed form B (described later) having a color close to gray because the saturation is higher as the evaluation score is higher.

  Thereby, the variable printing processing unit 111 determines the lightness of the variable image data representing the variable image according to the attribute data (means the brightness in the Lab color space, and in the present specification, the lightness has a broad meaning, It is possible to adjust the color tone including color) and saturation (color adjustment). In FIG. 4, the higher the evaluation score, the higher the saturation, and the larger the hatching width.

  In step S430, the variable print processing unit 111 executes color correction processing on the variable images A1 to A4 as necessary. With color correction processing, it is necessary to determine whether or not the variable images A1 to A4 after color adjustment are visually buried in the dominant color fixed form B in which the variable images A1 to A4 have been set, and to avoid such burial. Accordingly, the color tone of the variable images A1 to A4 is corrected.

  FIG. 6 is a flowchart showing the contents of color correction processing according to an embodiment. In step S431, the variable print processing unit 111 executes color conversion processing. In the color conversion processing, the variable printing processing unit 111 is in the Lab color space in which the characteristic is similar to the human visual sensitivity of the fixed form B in the RGB color space and the RGB image data which is the image data of the variable images A1 to A4. Convert to Lab image data which is image data.

  In step S432, the image analysis unit 112 of the control unit 110 executes a Delaunay diagram generation process. In the Delaunay diagram generation processing, the variable print processing unit 111 uses the saturation data and the luminance data stored at each lattice point of the spot color LUT 143 to create a Delaunay diagram.

FIG. 7 is an explanatory view showing the contents of the color correction processing according to the embodiment. FIG. 7A shows the Delaunay diagram DRD related to the luminance and saturation of the feature. The Delaunay diagram DRD is a diagram having a dual relationship with the Voronoi diagram. The Voronoi diagram is, in this example, a diagram in which the space closest to each point in the plane is divided by a line. The Delaunay diagram DRD is obtained by connecting generating points of a Voronoi region, and has the following features.
・ The perpendicular bisector of Delaunay becomes Voronoi.
Delaunay diagram The interior of the circumscribed circle of the Delaunay triangle of DRD does not include other Voronoi generating points.

  FIG. 7A shows the background tone point PM representing the background dominant color tone, the A region tone point PA representing the color of the region A, and the color of the region B in the Delaunay diagram DRD. A region B color point PB, a region C color point PC representing the color of region C, and a D region color point PD representing the color of region D are shown. FIG. 7A further shows a background Delaunay triangle TRm which is a Delaunay triangle to which the background tone point PM belongs.

  In step S433, the image analysis unit 112 executes storage processing of the triangle number of the background dominant color. The image analysis unit 112 stores the triangle number of the background Delaunay triangle TRm to which the background tone point PM belongs in a memory (not shown).

  In step S434, the image analysis unit 112 executes region selection processing. In the region selection process, the image analysis unit 112 selects the variable images A1 to A4 in order. The image analysis unit 112 first selects the variable image A1 (area A).

  In FIG. 7B, in the Delaunay diagram DRD, a variation Delaunay triangle TRa, which is a Delaunay triangle to which the A area tone point PA belongs, and a variation Delaunay triangle that is a Delaunay triangle to which the B area tone point PB belongs. TRb, a variation Delaunay triangle TRc (TRm) which is a Delaunay triangle to which the C region tone point PC belongs, and a variation Delaunay triangle TRd which is a Delaunay triangle to which the D region tone point PD belongs are shown.

  In step S435, the image analysis unit 112 executes storage processing of the triangle number of the selected area dominant color. The image analysis unit 112 stores the triangle number of the variable Delaunay triangle TRa to which the A region color point PA belongs, in a memory (not shown).

  In step S436, the image analysis unit 112 determines whether or not the background Delaunay triangle TRm to which the background tone point PM belongs and the variation Delaunay triangle TRa to which the A area tone point PA belongs are the same Delaunay triangle. Judge based on the comparison of If both Delaunay triangles are not identical, the image analysis unit 112 advances the process to step S438. If both Delaunay triangles are identical, the image analysis unit 112 advances the process to step S437. In this example, since the background Delaunay triangle TRm and the variation Delaunay triangle TRa have different triangle numbers, the process proceeds to step S438.

  In step S438, the image analysis unit 112 determines whether the processing of the entire area is completed. In this example, since the areas B to D are unprocessed, the process returns to step S434, and the next area B is selected. The image analysis unit 112 returns the process to step S434 because the background Delaunay triangle TRm to which the background tone point PM belongs and the variation Delaunay triangle TRb to which the B area tone point PB belongs are different (steps S435 to S438). .

  In step S434, the image analysis unit 112 selects the area C, and compares the background Delaunay triangle TRm to which the background tone point PM belongs with the variation Delaunay triangle TRc to which the C area tone point PC belongs based on the triangle number. Do. Since the variation Delaunay triangle TRc is the same Delaunay triangle as the background Delaunay triangle TRm, the image analysis unit 112 proceeds with the process to step S437.

  In step S437, the image processing unit 113 of the control unit 110 functions as a color correction unit, and executes correction processing. Since the variation Delaunay triangle TRc of the area C is the same as the background Delaunay triangle TRm of the background dominant color, it is determined that the color tone of both is close and the visibility of the area C with respect to the background dominant color is low.

  FIG. 8 is an explanatory view showing the contents of color correction processing according to an embodiment. In FIG. 8, the background Delaunay triangle TRm is shown enlarged. The background Delaunay triangle TRm has three vertices Pα, Pβ, Pγ and a center point PO (in this example, an outer center point). The background Delaunay triangle TRm comprises three inner triangles, ie, a first inner triangle composed of a vertex Pα, a vertex Pβ and a center point PO, and a second inner triangle composed of a vertex Pβ, a vertex Pγ and a center point PO And a third inner triangle composed of a vertex Pα, a vertex Pγ, and a center point PO.

  The image processing unit 113 identifies the inner triangle to which the C region tone point PC belongs, and determines the side of the background Delaunay triangle TRm where the C region tone point PC is closest. In this example, the image processing unit 113 specifies that the C region color point PC belongs to the second inner triangle, and specifies that the side PβPγ is the side closest to the C region color point PC. The image processing unit 113 further specifies an adjacent Delaunay triangle TRα, which is an Delaunay triangle adjacent to the side PβPγ. The second inner triangle is also referred to as a specific inner triangle.

  The image processing unit 113 calculates a direction vector from the C region tone point PC to the central point PαO of the adjacent Delaunay triangle TRα. The image processing unit 113 sets the correction point PCx at a position extended from the side PβPγ to the central point PαO by the distance d from the C area color point PC to the side PβPγ.

  In other words, the image processing unit 113 determines that the line connecting the variable tone point PC representing the position of the corrected tone of the variable image and the center of the adjacent Delaunay triangle TRα and the specific internal triangle to which the C region tone point PC belongs. When the intersection with the common side PβPγ, which is a side shared by the adjacent Delaunay triangle TRα, is defined as the adjacent intersection point PJ, the adjacent Delaunay triangle TRα from the adjacent intersection point PJ by the distance d between the variable color point PC and the adjacent intersection point PJ. Correction to the color tone of the correction point PCx moved in the center direction of. As a result, the image processing unit 113 can use the Delaunay triangle, and can acquire correction content sufficient for securing visibility with a small calculation load.

  In step S438, the image analysis unit 112 returns the process to step S434 and selects the area D because the area D is not processed. The image analysis unit 112 steps the processing because the background Delaunay triangle TRm to which the background tone point PM belongs and the variation Delaunay triangle TRd to which the D area tone point PD belongs are different, and there is no area left unprocessed. The process proceeds to S439 (steps S435 to S438).

  In step S439, the variable print processing unit 111 executes color conversion processing. In the color conversion process, the variable printing processing unit 111 sets the image data of the fixed form B (Lab image data), the image data of the variable images A1, A2 and A4 (Lab image data), and the variable image A3 after color correction. The image data (Lab image data) of the area C) is converted into RGB image data.

  In step S440 (see FIG. 5), the color conversion processing unit 131 executes color conversion processing. In color conversion processing, the color conversion processing unit 131 uses the spot color LUT 143 to color convert RGB image data into CMYKCR image data. The CMYKCR image data is a color space that can be reproduced with a color material used by the image forming unit 130.

  In this example, the color materials include C toner, M toner, Y toner, K toner, and CR toner. The C toner, the M toner, and the Y toner are color materials capable of reproducing gray, and can be used to adjust the saturation as composite black in a high luminance region. The K toner is a color material capable of reproducing gray, and can be used to adjust the saturation as a K dot in a low luminance region.

  In step S450, the halftone processing unit 132 performs halftone processing on the CMYKCR image data and outputs halftone data. In step S460, the image forming unit 130 executes an image output process (image formation on the print medium) based on the halftone data.

  FIG. 9 is an explanatory view showing a print image VPa after correction of the variable printing process according to the embodiment. The print image VPa after correction is different from the print image VP before correction in that the variable image A3 is corrected to become a variable image A3a. The variable image A3a suppresses the burying of the variable image A3a superimposed on the fixed form B in the fixed form B by a correction that intentionally reduces the saturation. In this example, it is assumed that the saturation of the fixed form B corresponds to the average evaluation, and the saturation of the variable image A3a corresponds to the evaluation lower than the average.

  As described above, according to the variable printing system 10 according to the embodiment, it is possible to correct the color tone including the luminance and the saturation without changing the hue based on the attribute data of the variable image using the spot color. As a result, the variable printing system 10 prevents the variable image superimposed on the fixed form from being buried in the fixed form due to the adjustment of the color tone of the variable image, and the visibility of the variable image superimposed on the fixed form is improved. It can be improved.

  The present invention can be implemented not only in the above-described embodiments but also in the following modifications.

  Modification Example 1: In the above embodiment, as shown in FIG. 8, the image processing unit includes a line connecting the variable color tone point PC and the center Pαo of the adjacent Delaunay triangle TRα, a specific internal triangle and the adjacent Delaunay triangle TRα Correction made by moving from the adjacent intersection PJ to the center of the adjacent Delaunay triangle TRα by the distance d between the fluctuating color tone point PC and the adjacent intersection PJ, where the intersection with the shared side PβPγ as the shared side is the adjacent intersection PJ. Although correction is made to the color tone of the point PCx, it is not limited to such a correction method.

  As shown in FIG. 10, the image processing unit may correct, for example, the color tone of the midpoint PCm1 of the line connecting the variable color tone point Pm1 and the center PβO of the adjacent Delaunay triangle TRβ. To the color tone of the center PγO of the adjacent Delaunay triangle TRγ. The image processing unit may be any one that corrects to a color tone belonging to the Delaunay triangle different from the background Delaunay triangle, for example, displays a preview image corrected to the color tone of the center PγO of the adjacent Delaunay triangle TRγ. A user interface may be provided to adjust the amount of correction in the direction. The correction amount may be set to a value exceeding the center position of the adjacent Delaunay triangle TRγ.

  Modified Example 2 In the above embodiment, the variable image is an illustration composed of a plurality of color tones in achromatic color, but the variable image is not limited to the achromatic illustration. Specifically, monochrome photographs of stores and products may be used.

  Modification 3: In the above embodiment, the present invention is applied to a variable printing system, but an image forming apparatus and an image forming method for extracting information from a database etc. and printing variable images having different contents one by one, It can also be applied to an image forming program.

10 variable printing system 100 image forming apparatus 200 personal computer 110 control unit 111 variable print processing unit 112 image analysis unit 113 image processing unit 120 image reading unit 130 image forming unit 131 color conversion processing unit 132 halftone processing unit 140 storage unit 141 printing unit Target database 142 Color table database 150 Communication interface unit

Claims (8)

An image forming portion capable of forming an image using a coloring material of a distinctive color capable of reproducing a chromatic color and a coloring material capable of reproducing gray;
Common image data representing a common image that is a common part of a plurality of image formations, variable image data representing a variable image that can vary in the plurality of image formations, and attribute data associated with the variable image data A variable print processing unit that arranges the variation image in the common image in a preset arrangement, and adjusts a color tone including lightness and saturation of the variable image data according to the attribute data When,
A Delaunay diagram of lightness and saturation reproducible by the image forming unit is generated, and a variation is a Delaunay triangle, which is a Delaunay triangle to which the color tone of the common image belongs, and a Delaunay triangle, to which the color tone of the adjusted variation image belongs. An image analysis unit that compares the background with the Delaunay triangle and determines whether the background Delaunay triangle and the variation Delaunay triangle are the same;
A color correction unit that further corrects the tone of the adjusted variation image to a tone belonging to a Delaunay triangle different from the background Delaunay triangle according to the determination that the background Delaunay triangle and the variation Delaunay triangle are identical. When,
An image forming apparatus comprising: The image forming apparatus according to claim 1,
The color correction unit may adjust the color tone of the adjusted variation image to any one of three internal triangles configured by connecting the center of the background Delaunay triangle and two points of the three vertices of the background Delaunay triangle. An image forming apparatus for identifying whether the image data belongs to the specific internal triangle that is the inner triangle to which the adjusted variation image color tone belongs and the color tone in the direction of the center of the adjacent Delaunay triangle that is the adjacent Delaunay triangle. The image forming apparatus according to claim 2,
The color correction unit is a line connecting a variable color tone point representing the position of the color tone of the adjusted variable image and the center of the adjacent Delaunay triangle, and a side shared by the specific internal triangle and the adjacent Delaunay triangle An image forming apparatus that corrects the color tone of a position moved from the adjacent intersection point to the center of the adjacent Delaunay triangle by the distance between the variable tone point and the adjacent intersection point, when the intersection point with the common side is the adjacent intersection point . The image forming apparatus according to claim 3,
The image forming apparatus according to claim 1, wherein the color correction unit corrects the color tone of the middle point of a line connecting the variable tone point and the center of the adjacent Delaunay triangle. The image forming apparatus according to claim 2,
The image forming apparatus, wherein the color correction unit corrects the color tone to the center of the adjacent Delaunay triangle. The image forming apparatus according to claim 2,
The image forming apparatus, wherein the color correction unit displays a preview image corrected to a color tone at the center of the adjacent Delaunay triangle, and provides a user interface for adjusting a correction amount toward the center of the adjacent Delaunay triangle. An image forming process capable of forming an image using a colorant of a distinctive color capable of reproducing a chromatic color and a colorant capable of reproducing gray;
Common image data representing a common image that is a common part of a plurality of image formations, variable image data representing a variable image that can vary in the plurality of image formations, and attribute data associated with the variable image data A variable printing process step of arranging the variation image in the common image in a preset arrangement, and adjusting the color tone including the lightness and saturation of the variable image data according to the attribute data When,
A Delaunay diagram of lightness and saturation reproducible by the image forming process, and a variation that is a background Delaunay triangle which is a Delaunay triangle to which the color tone of the common image belongs and a Delaunay triangle to which the color tone of the adjusted variation image belongs An image analysis step of comparing with the Delaunay triangle and determining whether the background Delaunay triangle and the variation Delaunay triangle are identical;
A color correction step of further correcting the color tone of the adjusted fluctuation image to a color tone belonging to the Delaunay triangle different from the background Delaunay triangle according to the judgment that the background Delaunay triangle and the variation Delaunay triangle are identical When,
An image forming method comprising: An image forming program for controlling an image forming apparatus having an image forming unit capable of forming an image using a color material of a distinctive color capable of reproducing a chromatic color and a color material capable of reproducing gray,
Common image data representing a common image that is a common part of a plurality of image formations, variable image data representing a variable image that can vary in the plurality of image formations, and attribute data associated with the variable image data A variable print processing unit that arranges the variation image in the common image in a preset arrangement, and adjusts a color tone including lightness and saturation of the variable image data according to the attribute data ,
A Delaunay diagram of lightness and saturation reproducible by the image forming unit is generated, and a variation is a Delaunay triangle, which is a Delaunay triangle to which the color tone of the common image belongs, and a Delaunay triangle, to which the color tone of the adjusted variation image belongs. An image analysis unit that compares the background with the Delaunay triangle and determines whether the background Delaunay triangle and the variation Delaunay triangle are the same;
A color correction unit that further corrects the tone of the adjusted variation image to a tone belonging to a Delaunay triangle different from the background Delaunay triangle according to the determination that the background Delaunay triangle and the variation Delaunay triangle are identical. An image forming program for causing the image forming apparatus to function as