JP6677214B2 - Image processing apparatus, image processing method, and image processing program - Google Patents

Description

  The present invention relates to an image processing apparatus, an image processing method, and an image processing 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 has become 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, color profiles applied to color conversion processing of form data for forming a fixed form and 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. Has been proposed to enable selection of whether or not to apply the color profile specified in, and to match the color tone of the form data printed out with the color tone of the variable data.

JP 2008-92312 A

  However, sufficient consideration has not been given to the visibility of a variable image superimposed on a fixed form.

  The present invention has been made in view of such a situation, and has as its object to provide a technique for improving the visibility of a variable image superimposed on a fixed form.

  The image processing apparatus according to the present invention is configured such that common image data representing a common image serving as a common part of a plurality of printed matters, variable image data representing a fluctuating image that can fluctuate in the plurality of printed matters, and the variable image data are linked. And a variable print processing unit that acquires the attribute data, and arranges the variable image in the common image in a preset arrangement, and a first correction unit that corrects the color of the variable image data according to the attribute data. A color correction unit that analyzes a first color that is a color of the corrected variation image and a second color that is a color of the common image, and calculates a difference between the first color and the second color; An image analysis unit that determines whether the first color difference is within a first range that is set in advance, and an image analysis unit that determines that the first color difference is within a first range that is set in advance. Accordingly, the first color and the second color Without even and a second color correction unit for correcting one to increase the difference of the second color and the first color.

  The image processing method according to the present invention is configured such that common image data representing a common image serving as a common part of a plurality of printed matters, variable image data representing a fluctuating image that can fluctuate in the plurality of printed matters, and the variable image data A variable print processing step of acquiring the attribute data of the variable image data and arranging the variable image in the common image in a preset arrangement, and correcting the color of the variable image data according to the attribute data. A color correcting step of analyzing a first color that is a color of the corrected variation image and a second color that is a color of the common image, and calculating a difference between the first color and the second color; An image analysis step of determining whether or not the first color difference is within a first range set in advance, and a determination that the first color difference is within the first range set in advance Accordingly, the first color and the second color At least one of the saturation correction to the and a second color correction process to increase the difference of the second color and the first color.

  The present invention provides an image processing program for controlling an image processing device. The image processing program is associated with common image data representing a common image serving as a common part of a plurality of printed matters, variable image data representing a fluctuating image that can fluctuate in the plurality of printed matters, and the variable image data. A variable print processing unit that acquires attribute data and arranges the variable image in the common image in a preset arrangement, a first color correction unit that corrects the color of the variable image data according to the attribute data Analyzing a first color that is a color of the corrected fluctuation image and a second color that is a color of the common image, and calculating a first color that is a difference between the first color and the second color. An image analysis unit that determines whether the color difference is within a first range set in advance; and an image analysis unit that determines that the first color difference is in a first range set in advance. Of the first color and the second color Without even to function the image processing apparatus as a second color correction section to increase the difference of the second color and the first color by correcting one.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which improves the visibility of the variable image superimposed on the fixed form can be provided.

1 is a block diagram illustrating a functional configuration of a variable printing system 10 according to an embodiment of the present invention. 9 is a flowchart illustrating the contents of a variable printing process according to an embodiment. 9 is a table showing contents of a database used for variable printing processing according to an embodiment. FIG. 4 is an explanatory diagram illustrating a print image to be corrected in a variable print process and a color table according to an embodiment. 6 is a flowchart illustrating the contents of a print execution process according to an embodiment. 6 is a flowchart illustrating the contents of a color correction process according to an embodiment. FIG. 5 is an explanatory diagram illustrating the content of a color correction process according to an embodiment in a Lab color space. FIG. 9 is an explanatory diagram illustrating the content of a correction execution process according to an embodiment. FIG. 4 is an explanatory diagram illustrating a print image after correction in a variable print process according to an embodiment.

  Hereinafter, embodiments 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.

  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 personal computer 200 is connected to the image forming apparatus 100 using the communication interface unit 150.

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

  The storage unit 140 is a storage device including a non-temporary recording medium such as a hard disk drive and a flash memory, and stores a control program and data of a process executed by the control unit 110. The storage unit 140 further stores a print target database 141 and a color table database 142.

  FIG. 2 is a flowchart illustrating the contents of the variable printing process according to the embodiment. FIG. 3 is a table showing the contents of a database used for variable printing processing according to the embodiment. FIG. 4 is an explanatory diagram illustrating a print image VP and a color table formed by the variable printing process according to the embodiment. In the variable printing process according to the present embodiment, the variable printing system 10 is configured to display four variable images A1 to A4 superimposed on the fixed form B as an example.

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

  The rating indicates a quantitative rating score collected by a web server (not shown) on the Internet. The variable print processing unit 111 uses the communication interface unit 150 to periodically acquire data representing the evaluation from a web server (not shown) and update the print target database 141.

  In the present embodiment, the divided area is any one of the areas A to D for each record based on the number of display areas (four in this example) of the variable images arranged on the fixed form B and the evaluation score. Is automatically set. Specifically, the variable image with the highest evaluation score is automatically arranged in the upper left area A, and the variable image with the lowest evaluation score (not in this example) is automatically arranged in the lower right area D. Is set. In this example, it is assumed that the divided area is automatically set according to a result of a 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 that is a common part of a plurality of printed materials. The variable image data is image data representing a fluctuating image that can fluctuate in a plurality of printed materials. In the present embodiment, the variable printing system 10 automatically generates print data using the common image data and the variable image data.

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

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

  In this example, the user selects the fixed form B and sets so that four variable images A1 to A4 are displayed in a predetermined size and position. In the present embodiment, the variable images A1 to A4 are illustrations composed of a plurality of color tones in an achromatic color.

  In step S300, the user executes a color determination process on personal computer 200. In the color determination process according to the present embodiment, the user sets the background dominant color, which is the dominant color (also referred to as the dominant color) of the fixed form B, as the hue angle (master_H) and in the vicinity of R in this example. The dominant color scheme is a method of measuring the overall unity in hue, and is a color scheme in which the hue (tone) is changed in the same or similar hue.

  In this example, the hue angle (master_H) of the background dominant color is set by the user, but the invention is not necessarily limited to the case where the user sets the hue angle (master_H) of the background dominant color. The hue angle (master_H) of the background dominant color may be prepared in advance as attribute data according to the image data of the fixed form, or may be calculated from the image data of the fixed form by a known method.

  The color tone is obtained by collecting and grouping colors having similar lightness and saturation. The color tone includes a pure color, a clear color, a neutral color, and an achromatic color. A pure color has a very high saturation and a vivid color tone. There are two types of pure color: light pure color that is made by mixing white with pure color, and dark color that is made by mixing black with pure color. The neutral color is a cloudy color formed by adding gray to pure color. Achromatic colors are unsaturated white, gray and black.

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

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

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

  Specifically, the variable print processing unit 111 stores the magenta color table Y corresponding to the evaluation 3.5 in a memory (not shown) in association with the record of the store number 001, A red color table X corresponding to the evaluation 1.9 is stored in a memory (not shown) in association with the record of the store number 003, and a blue color table Z memory corresponding to the evaluation 4.2 is stored in the memory (not shown). (Not shown), and stores the corresponding gray color table W without evaluation in a memory (not shown) in association with the record of the store number 004.

  In the present embodiment, the variable images A1 to A4 are quantitatively set such that the higher the evaluation score, that is, the higher the evaluation, the closer the hue of the dominant color becomes from R to B. On the other hand, since the hue of the dominant color of the fixed form B is set near R, the variable images A1 to A4 are set to be more prominent in the fixed form B as the evaluation score is higher. In FIG. 4, the hatching width is different as the evaluation score is higher.

  In step S430, the variable print processing unit 111 executes a color correction process on the variable images A1 to A4 as necessary. The color correction processing determines whether or not the variable images A1 to A4 after the color correction processing are visually buried in the set dominant-color fixed form B, and is necessary to avoid such burying. This is processing for adjusting the hue of the variable images A1 to A4 accordingly.

  FIG. 6 is a flowchart illustrating the content of the color correction process according to the embodiment. In step S431, the variable print processing unit 111 executes a color conversion process. In the color conversion processing, the variable print processing unit 111 converts the RGB image data that is the image data of the fixed form B and the variable images A1 to A4 in the RGB color space into the Lab image data that is the image data in the Lab color space.

  FIG. 7 is an explanatory diagram illustrating the content of the color correction process according to the embodiment in a Lab color space. FIG. 7A shows the fixed form B and the image data of the variable images A1 to A4 in a Lab color space before the color correction processing. FIG. 7B illustrates the fixed form B and the image data of the variable images A1 to A4 in the Lab color space after the color correction processing. The Lab color space is different from the RGB and CMYK color spaces and is designed to approximate human vision. Thus, the variable printing system 10 can facilitate color correction in consideration of human vision.

  In step S432, the variable print processing unit 111 stores a preset hue angle of the background dominant color (near master_H: R) in a memory (not shown). The background dominant color is the dominant color of the fixed form B.

  In step S433, the variable print processing unit 111 executes an area selection process. In the area selection processing, the variable print processing unit 111 sequentially selects the variable images A1 to A4. In this example, it is assumed that the variable image A3 (region C) has been selected.

  In step S434, the variable print processing unit 111 stores the hue angle (area_H (C)) of the selected area dominant color in a memory (not shown). The selected area dominant color is a dominant color of the selected variable image (in this example, the variable image A3 (area C)).

  In this example, the hue angle (master_H) of the background dominant color is a hue angle (corresponding to the hue angle θ in FIG. 7A) with the R axis as a reference axis. The variable image A1 (area A) has a hue angle (area_H (A)). The variable image A2 (area B) has a hue angle (area_H (B)). The variable image A3 (area C) has a hue angle (area_H (C)). The variable image A4 (region D) has no hue because it is achromatic.

  In this example, the hue angle of the variable image is determined according to the color table selected from the color table database 142 based on the evaluation score, but may be set by another method. Specifically, for example, it may be calculated by a known method from the image data of the variable image selected based on the evaluation score.

  FIG. 8 is an explanatory diagram showing the contents of the correction execution process (step S435) according to one embodiment. As shown in FIG. 8A, in step S435, the control unit 110 executes a correction execution process. In step S4351, the image analysis unit 112 executes a first hue difference calculation process. In the first hue difference calculation process, the image analysis unit 112 calculates a hue difference dH that is a difference between the hue angle (area_H) of the selected area dominant color and the hue angle (master_H) of the background dominant color. In this example, the selected area dominant color corresponds to the first color, the background dominant color corresponds to the second color, and the hue difference dH corresponds to the first color difference.

  In this example, since the variable image A3 (region C) is selected, the image analysis unit 112 determines whether the image data of the variable image A3 (region C) as the variable image data and the fixed form B as the common image data The image data is analyzed to calculate a hue difference dH between the hue angle (area_H (c)) of the selected area dominant color and the hue angle (master_H) of the background dominant color.

  In step S4352, the image analysis unit 112 determines whether the hue difference dH is smaller than a preset threshold Th. If the hue difference dH is smaller than the threshold Th, the image analysis unit 112 advances the process to step S4353. If the hue difference dH is equal to or greater than the threshold Th, the image analysis unit 112 advances the process to step S436 (see FIG. 6). In this example, as can be seen from FIG. 7A, the hue difference dH is smaller than the threshold Th (also referred to as being within the first range), and thus the process proceeds to step S4353.

  In step S4353, the image processing unit 113 functions as a first color correction unit and performs a first image correction process. In the first image correction process, the image processing unit 113 adjusts the hue in the direction in which the hue of the variable image A3 (region C) is separated from the hue angle (master_H) of the background dominant color in the Lab color space (FIG. 7B). reference). Thus, the variable image A3 (area C) has the hue angle (C_area_H (C)).

  In the present embodiment, the image processing unit 113 adjusts the hue of the variable image A3 so that the hue of the variable image A3 departs from the hue angle of the background dominant color. Or the hues of both may be adjusted. As described above, the image processing unit 113 only needs to be configured to adjust (correct) at least one of the hue of the variable image and the hue of the background dominant color and separate them.

  When the hue angle (C_area_H (C)) of the corrected variable image A3 approaches one of the other variable images A1 and A2, the variable image on the side closer to the hue angle of the corrected variable image A3 ( For example, the hue angle of the variable image A2) may be corrected. By doing so, the characteristic that the variable images A1 to A4 can be made more prominent in the fixed form B as the evaluation score is higher can be maintained even after the correction.

  In step S4354, the image analysis unit 112 executes a second hue difference calculation process. In the second hue difference calculation process, the image analysis unit 112 calculates a hue difference that is a difference between the hue angle (data_dH) of the image data of the variable image and the hue angle (master_H) of the background dominant color. Since the variable images A1 to A4 are configured as images of a single hue, in this example, they have a hue difference sufficiently separated from the hue angle (master_H) of the background dominant color.

  In step S4355, the image analysis unit 112 proceeds with the process to step S4356 if the hue difference (data_dH) is smaller than the threshold Th, and proceeds to step S436 if the hue difference (data_dH) is equal to or larger than the threshold Th. (See FIG. 6). In this example, since the hue difference (data_dH) is equal to or greater than the threshold Th, the process proceeds to step S436 (see FIG. 6). In this example, the first range and the second range are set to the same hue angle range.

  When the variable image is not an image of a single hue, the image analysis unit 112 determines the hue of the image region for each of a plurality of image regions having different hues from each other in the variable image after the first image correction process. It is determined whether or not the hue difference (data_dH) between the hue angle (data_dH) of the background dominant color and the hue angle (master_H) of the background dominant color is smaller than a threshold Th (that is, whether or not the difference is within a second range).

  In step S4356, the image processing unit 113 functions as a second color correction unit, and performs the second image correction process on an image region in which the hue difference (data_dH) is smaller than the threshold Th. In the second image correction process, the image processing unit 113 decreases the correction amount (in this example, the adjustment amount of the hue angle) as the distance from the dominant color arrangement of the variable image increases in order to maintain the dominant color arrangement. The hue difference (data_dH) is also called a second color difference.

  Specifically, the image processing unit 113 can correct the hue using Expression F shown in FIG. 8B. In Expression F, data_dH ′, data_H, and area_mH are the hue angle of the image area after correction, the hue angle of the image area before correction, and the hue angle of the dominant color of the image area before correction, respectively.

  In step S436 (see FIG. 6), the variable print processing unit 111 performs a color conversion process. In the color conversion processing, the variable print processing unit 111 includes the image data of the fixed form B (Lab image data), the image data of the variable images A1 to A3 (Lab image data), and the image data of the variable image A4 after the color correction. (Lab image data) is converted to RGB image data.

  In step S437, the variable print processing unit 111 determines whether or not processing has been performed for all the selected areas. The variable print processing unit 111 proceeds with the process to step S440 (see FIG. 5) when the processing has been performed for all the selected areas, and proceeds to step S440 when the unprocessed variable image area remains. The process returns to S433.

  In step S440, the color conversion processing unit 131 performs a color conversion process. In the color conversion processing, the RGB image data is color-converted into CMYK image data. The CMYK image data is a color space that can be reproduced by a color material used by the image forming unit 130.

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

  FIG. 9 is an explanatory diagram illustrating a print image VPa after correction of the variable print processing according to the embodiment. The print image VPa after the correction is different from the print image VP before the correction in that the variable image A3 is corrected to become the variable image A3a. In the variable image A3a, embedding of the variable image A3a superimposed on the fixed form B by the correction in the fixed form B is suppressed.

  As described above, according to the variable printing system 10 according to the embodiment, the hue can be corrected based on the attribute data of the variable image. Furthermore, the variable printing system 10 suppresses the variable image superimposed on the fixed form from being buried in the fixed form due to the correction of the hue of the variable image, and improves the visibility of the variable image superimposed on the fixed form. Can be done.

  The present invention can be implemented not only in the above embodiments but also in the following modified examples.

  Modified Example 1 In the above embodiment, the variable image is an illustration composed of a plurality of tones in an achromatic color, but the variable image is not limited to an achromatic illustration. Specifically, it may be a monochrome photograph of a store or a product.

  Further, the variable image may be a variable image including a chromatic photograph or illustration. In such a case, it is preferable that the variable printing system execute color conversion for converting the hue of the variable image into a preset dominant color. Specifically, the variable printing system analyzes, for example, the hue of a variable image to be subjected to color correction, reduces the relative variation of the hue angle in the variable image, and sets the hue angle to a predetermined color. Can be converted to

  Modification 2 In the above embodiment, the variable printing system corrects the hue based on the attribute data of the variable image. However, it is not always necessary to correct the hue. Specifically, for example, at least one of the saturation and the brightness may be corrected based on the attribute data of the variable image. In this case, the first color difference and the second color difference are the difference between at least one of saturation and lightness, and the color table quantitatively changes at least one of saturation and lightness according to the evaluation score. Can be configured.

  In such a configuration, the variable printing system adjusts at least one of hue, saturation, and lightness to suppress burying in the fixed form and improve visibility of the variable image superimposed on the fixed form. Can be. However, when the hue is corrected, a remarkable effect can be obtained when the image data is arranged by the technique of the dominant color arrangement. On the other hand, when the color tone (tone) is corrected, a remarkable effect can be obtained when the image data is colored by the dominant tone color scheme.

  Modification 3 In the above embodiment, the present invention is applied to a variable printing system. However, an image processing apparatus and an image processing method for extracting information from a database or the like and performing variable image processing with different contents one by one, It can also be applied to an image processing program.

10 Variable printing system 100 Image forming apparatus 200 Personal computer 110 Control unit 111 Variable printing processing unit 112 Image analyzing 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 Target database 142 Color table database 150 Communication interface

Claims (4)

Acquire common image data representing a common image that is a common part of a plurality of printed materials, variable image data representing a variable image that can be varied in the plurality of printed materials, and attribute data associated with the variable image data. A variable print processing unit that arranges the variable image in the common image in an arrangement that is set in advance,
A first color correction unit that corrects the color of the variable image data according to the attribute data;
A first color that is a color of the corrected fluctuation image and a second color that is a color of the common image are analyzed, and a first color that is a difference between the first color and the second color is analyzed. An image analysis unit that determines whether the difference is within a first range set in advance;
In response to the determination that the first color difference is within a preset first range, at least one of the first color and the second color is corrected to correct the first color and the second color. A second color correction unit for increasing the difference between the two colors;
Equipped with a,
The image analysis unit uses a difference between hue angles of the first color and the second color as a difference between the first color and the second color,
The second color correction unit corrects the first color,
The common image data and the variation image are both color-based based on the dominant color,
The hue angle is a hue angle of the dominant color,
The fluctuation image has a plurality of image regions having different hues from each other,
After performing the correction for changing the hue angle of the dominant color of the first color, the image analysis unit may determine a second color difference that is a difference from the second color for each of the plurality of image regions. It is determined whether or not it is within a preset second range,
The second color correction unit adjusts a hue angle for each of the plurality of image regions in response to the determination that the second color difference is within a second range set in advance,
The second color correction unit is configured to reduce an adjustment amount of the hue angle of the image region as the difference between the plurality of hue angles of the plurality of image regions and the hue angle of the dominant color of the first color increases. apparatus. The image processing device according to claim 1 ,
The attribute data is quantitative data,
The image processing device, wherein the first color correction unit quantitatively adjusts a hue angle of the first color based on the attribute data. Acquire common image data representing a common image that is a common part of a plurality of printed materials, variable image data representing a variable image that can be varied in the plurality of printed materials, and attribute data associated with the variable image data. A variable print processing step of arranging the variable image in the common image in a preset arrangement;
A first color correction step of correcting the color of the variable image data according to the attribute data;
A first color that is a color of the corrected fluctuation image and a second color that is a color of the common image are analyzed, and a first color that is a difference between the first color and the second color is analyzed. An image analysis step of determining whether or not the difference is within a preset first range;
In response to the determination that the first color difference is within a preset first range, at least one of the first color and the second color is corrected to correct the first color and the second color. A second color correction step of increasing the difference between the two colors;
Equipped with a,
The image analysis step uses a difference in hue angle between the first color and the second color as a difference between the first color and the second color,
The second color correction step corrects the first color,
The common image data and the variation image are both color-based based on the dominant color,
The hue angle is a hue angle of the dominant color,
The fluctuation image has a plurality of image regions having different hues from each other,
In the image analysis step, after performing the correction for changing a hue angle of the dominant color of the first color, a second color difference, which is a difference from the second color, for each of the plurality of image areas is calculated. It is determined whether or not it is within a preset second range,
The second color correction step adjusts a hue angle for each of the plurality of image areas in accordance with the determination that the second color difference is within a second range set in advance.
It said second color correction process, you reduce the amount of adjustment of the hue angle of a plurality of hue angle between the first as the image area hue angle and the difference between the dominant colors is large color of the plurality of image areas image Processing method. An image processing program for controlling an image processing device,
Acquire common image data representing a common image that is a common part of a plurality of printed materials, variable image data representing a variable image that can be varied in the plurality of printed materials, and attribute data associated with the variable image data. A variable print processing unit that arranges the variable image in the common image in an arrangement that is set in advance,
A first color correction unit that corrects the color of the variable image data according to the attribute data;
A first color that is a color of the corrected fluctuation image and a second color that is a color of the common image are analyzed, and a first color that is a difference between the first color and the second color is analyzed. An image analysis unit configured to determine whether the difference is within a first range set in advance; and an image analysis unit configured to determine whether the first color difference is in a first range set in advance. Causing the image processing apparatus to function as a second color correction unit that corrects at least one of the first color and the second color to increase the difference between the first color and the second color ;
The image analysis unit uses a difference between hue angles of the first color and the second color as a difference between the first color and the second color,
The second color correction unit corrects the first color,
The common image data and the variation image are both color-based based on the dominant color,
The hue angle is a hue angle of the dominant color,
The fluctuation image has a plurality of image regions having different hues from each other,
After performing the correction for changing the hue angle of the dominant color of the first color, the image analysis unit may determine a second color difference that is a difference from the second color for each of the plurality of image regions. It is determined whether or not it is within a preset second range,
The second color correction unit adjusts a hue angle for each of the plurality of image regions in response to the determination that the second color difference is within a second range set in advance,
The second color correction section, reduce the amount of adjustment of the hue angle of a plurality of hue angle between the first as the image area hue angle and the difference between the dominant colors is large color of the plurality of image areas image Processing program.