JP4793582B2 - Image processing apparatus, color conversion method and program - Google Patents

Description

  The present invention relates to an image processing apparatus and a color conversion method for performing color conversion of input image data.

  When RGB image data is printed by a printer or the like, it is necessary to perform RGB → CMYK color conversion. Direct conversion from RGB to CMYK includes conversion from RGB space to device-independent color space such as XYZ color system and L * a * b * color system, and conversion from device-independent color space to CMYK space. This can be realized by synthesizing the two-stage conversion. However, since there is a large difference in the shape and size of the color gamut between the RGB space and the CMYK space, in order to create an appropriate color conversion table, tuning is necessary when converting from a device-independent color space to CMYK. I wo n’t.

  In particular, when preparing a RGB → CMYK conversion table group for incorporation in a printer, some typical papers such as plain paper, coated paper, newspaper, etc. are used as standard papers at the time of printer development. Generally, the standard paper is prepared and subjected to the above tuning.

  However, since there is a limit to the types of standard papers for which color conversion tables can be prepared in advance, when a user selects and uses paper that is not standard paper, a plurality of standard papers prepared in advance are used. It was only possible to select a standard paper having similar characteristics from the paper and use the characteristics of this standard paper as substitute characteristics.

  In this case, since color conversion is performed according to a sheet different from the characteristics of the user sheet, only unsatisfactory color conversion can be performed such as gray balance cannot be achieved or hue shift occurs.

  In order to correct a color conversion defect even a little, CMYK gradation characteristics are also corrected by applying calibration. However, calibration is correction performed to reproduce a target color. If the shape of the color gamut differs due to the difference in paper characteristics as described above, it is necessary to perform color gamut shape conversion, that is, color mapping. For this reason, even if calibration is performed, improvement of problems caused by the difference in paper characteristics cannot be expected.

  In addition, various methods for creating a color conversion table in consideration of the characteristics of user paper have been proposed (see, for example, Patent Documents 1, 2, and 3).

  Patent Document 1 discloses that a profile of an arbitrary sheet is created based on an existing sheet profile. Patent Document 2 discloses that characteristic data of various types of paper is held and a paper having the closest characteristic from the color measurement result is specified as the target paper. Further, Patent Document 2 discloses that a LUT (Look Up Table) portion in a profile is rewritten based on a difference from a standard value to obtain a profile of the corresponding sheet. Japanese Patent Application Laid-Open No. 2004-228561 discloses that an arbitrary paper profile is created based on two types of paper profiles.

  However, all of the methods disclosed in Patent Documents 1 to 3 simply create a profile corresponding to the characteristics of the user paper, and the color conversion accuracy is low, and the color conversion always matches the characteristics of the user paper. Can not do.

JP 7-87349 A Japanese Patent Laying-Open No. 2005-210225 JP 2005-229521 A

  The prior art described above has a problem that color conversion that matches the characteristics of the user paper cannot be performed with high accuracy.

  An object of the present invention is to provide an image processing apparatus and a color conversion method capable of accurately performing color conversion that matches the characteristics of user paper on which a user intends to output an image.

[Image processing device]
In order to achieve the above object, an image processing apparatus according to the present invention includes a plurality of preset color conversion tables for converting first color system image data into second color system image data. First storage means stored for each standard sheet,
A second storage means in which a device profile of the image output apparatus is stored corresponding to the plurality of standard papers;
Selection means for selecting a standard paper whose characteristics are similar to those of a user paper that the user intends to use when outputting an image from a plurality of standard papers for which the color conversion table and the device profile are prepared in advance. When,
Based on the device profile corresponding to the standard paper selected by the selection means and the device profile of the image output apparatus generated corresponding to the user paper, the second color system image data for the standard paper is obtained. Creating means for creating a conversion table for converting into image data of the second color system for user paper;
Based on the color conversion table corresponding to the standard paper selected by the selecting means and the conversion table created by the creating means, the image data of the first color system is converted into the second color for user paper. Synthesizing means for synthesizing a color conversion table for conversion into system image data.

In the image processing apparatus of the present invention, a color conversion table for converting the first color system image data into the second color system image data is provided for each of a plurality of preset standard sheets. Stored first storage means;
A second storage means in which a device profile of the image output apparatus is stored corresponding to the plurality of standard papers;
Selection means for selecting a standard paper whose characteristics are similar to those of a user paper that the user intends to use when outputting an image from a plurality of standard papers for which the color conversion table and the device profile are prepared in advance. When,
Based on the device profile corresponding to the standard paper selected by the selection means and the device profile of the image output apparatus generated corresponding to the user paper, the second color system image data for the standard paper is obtained. Creating means for creating a conversion table for converting into image data of the second color system for user paper;
Based on the color conversion table corresponding to the standard paper selected by the selecting means and the conversion table created by the creating means, the input image data of the first color system is used for the user paper. And a color conversion means for converting the image data into the color system image data 2.

The image processing apparatus of the present invention includes a first storage unit that stores a color conversion table for performing color conversion of input image data for each of a plurality of preset standard sheets,
A second storage means in which a device profile of the image output apparatus is stored corresponding to the plurality of standard papers;
Selection means for selecting a standard paper whose characteristics are similar to those of a user paper that the user intends to use when outputting an image from a plurality of standard papers for which the color conversion table and the device profile are prepared in advance. When,
Based on the device profile corresponding to the standard paper selected by the selection means and the device profile of the image output apparatus generated corresponding to the user paper, the image data for standard paper is converted into image data for user paper. Creating means for creating a conversion table for conversion;
Color conversion for converting input image data into image data for user paper based on the color conversion table corresponding to the standard paper selected by the selection means and the conversion table created by the creation means Combining means for combining the tables.

The image processing apparatus of the present invention includes a first storage unit that stores a color conversion table for performing color conversion of input image data for each of a plurality of preset standard sheets,
A second storage means in which a device profile of the image output apparatus is stored corresponding to the plurality of standard papers;
Selection means for selecting a standard paper whose characteristics are similar to those of a user paper that the user intends to use when outputting an image from a plurality of standard papers for which the color conversion table and the device profile are prepared in advance. When,
Based on the device profile corresponding to the standard paper selected by the selection means and the device profile of the image output apparatus generated corresponding to the user paper, the image data for standard paper is converted into image data for user paper. Creating means for creating a conversion table for conversion;
Color conversion means for converting input image data into image data for user paper based on the color conversion table corresponding to the standard paper selected by the selection means and the conversion table created by the creation means; Have

  Preferably, the selection unit selects a standard paper whose characteristics are similar to those of the user paper based on designation by the user.

  Preferably, the selection unit has a correlation between a device profile of the image output apparatus generated corresponding to the user sheet and a plurality of device profiles corresponding to the standard sheet stored in the first storage unit. Based on this, a standard paper whose characteristics are similar to those of the user paper is selected.

  Furthermore, it preferably further includes device profile creation means for creating a device profile of the image output apparatus corresponding to the user paper based on the measurement result of the colorimetric pattern formed on the user paper.

[Color conversion method]
In the color conversion method of the present invention, a color conversion table for converting image data of the first color system into image data of the second color system and a device profile of the image output apparatus are prepared in advance. Select a standard paper whose characteristics are similar to those of the user paper that the user intends to use when outputting images from a number of standard papers.
Based on the device profile corresponding to the selected standard paper and the device profile of the image output apparatus generated corresponding to the user paper, the second color system image data for the standard paper is obtained for the user paper. Create a conversion table to convert to image data of the second color system,
Based on the color conversion table corresponding to the selected standard paper and the created conversion table, the image data of the first color system is converted to image data of the second color system for user paper.

[program]
Further, the program of the present invention includes a plurality of color conversion tables for converting image data of the first color system to image data of the second color system and a device profile of the image output apparatus. Selecting a standard paper whose characteristics are similar to those of a user paper, which is a paper that the user intends to use when outputting an image, from the standard paper;
Based on the device profile corresponding to the selected standard paper and the device profile of the image output apparatus generated corresponding to the user paper, the second color system image data for the standard paper is obtained for the user paper. Creating a conversion table for converting into image data of the second color system;
Converting the first color system image data into the second color system image data for user paper based on the color conversion table corresponding to the selected standard paper and the created conversion table; Is executed on the computer.

  As described above, according to the present invention, it is possible to obtain an effect that it is possible to accurately perform color conversion that matches the characteristics of the user paper on which the user wants to output an image.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram showing a configuration of an image processing system including an image forming apparatus 10 according to the first embodiment of the present invention.

  As illustrated in FIG. 1, the image processing system includes an image forming apparatus 10 and a terminal device 20 connected via a network 14. The terminal device 20 generates print data such as a print job and transmits it to the image forming apparatus 10. The image forming apparatus 10 receives the print data transmitted from the terminal device 20 and outputs an image corresponding to the print data on the printing paper.

  Next, FIG. 2 shows a hardware configuration of the image forming apparatus 10 of the present embodiment.

  As shown in FIG. 2, the image forming apparatus 10 includes a CPU 18, a memory 19, a storage device 22 such as a hard disk drive (HDD), a communication interface (data transmission and reception) with an external computer via a network 14. IF) 24, a user interface (UI) device 26 including a touch panel or a liquid crystal display and a keyboard, and a print engine 28. These components are connected to each other via a control bus 16.

  The CPU 18 executes predetermined processing based on the image processing program stored in the memory 19 or the storage device 22 and controls the operation of the image forming apparatus 10. The image processing program may be provided from the outside via the communication IF 24, or may be provided by being stored in a storage medium such as a CD-ROM.

  FIG. 3 is a block diagram showing a functional configuration of the image forming apparatus 10 realized by executing the image processing program.

  As shown in FIG. 3, the image forming apparatus 10 of the present embodiment includes a paper feeding device 29, print engines 28K to 28Y, engine controllers 30K to 30Y, a discharge device 31, a printer controller 32, and RGB- Color conversion table storage unit 34 for CMYK conversion, printer profile storage unit 35 measured for a plurality of preset standard sheets 1, 2,..., And color conversion for CMYK-CMYK conversion And a table storage unit 36. In the printer controller 32, an image processing device 33 for performing image processing on image data to be printed is configured.

  The color conversion table storage unit 34 stores a color conversion table for converting RGB image data into CMYK image data for each of a plurality of preset standard sheets.

  In the printer profile storage unit 35, for example, a printer device profile (hereinafter referred to as a printer profile) expressed by an ICC (International Color Consortium) profile or the like is stored corresponding to a plurality of standard sheets.

  The color conversion table storage unit 36 stores a color conversion table for converting CMYK image data into CMYK image data for each of a plurality of preset standard sheets.

  The engine controllers 30K to 30Y control operations of the print engines 28K to 28Y, respectively. The print engines 28 </ b> K to 28 </ b> Y perform printing based on the print data for each color of YMCK on the printing paper fed by the paper feeding device 29, and output it to the discharge device 31. The print engines 28K to 28Y function as an image output device that outputs an image based on the image data after color conversion is performed by the image processing device 33.

  Next, the configuration of the image processing apparatus 33 in FIG. 3 will be described with reference to FIG.

  As illustrated in FIG. 4, the image processing apparatus 33 according to the present embodiment includes a selection unit 41, a conversion table creation unit 42, and a color conversion table synthesis unit 43.

  Although not shown in FIG. 4, the image forming apparatus 33 according to the present embodiment includes a printer profile creation unit. The printer profile creation unit forms a color measurement pattern on the user paper and creates a print profile 37 corresponding to the user paper based on the measurement result obtained by measuring the color measurement pattern with a colorimeter or the like. To do.

  The selection unit 41 selects a standard sheet whose characteristics are similar to those of a user sheet, which is a sheet that the user intends to use when outputting an image, from a plurality of standard sheets for which a color conversion table and a printer profile are prepared. .

  As a specific method for the selection unit 41 to select a standard paper whose characteristics are similar to that of the user paper from a plurality of standard papers, the following method can be considered.

  (1) Designated by the user.

  (2) The user needs to specify the characteristics that are normally required for the process parameters. For example, it is necessary to designate plain paper / coated paper / newspaper for the fixing parameter. Therefore, a standard paper whose characteristics are similar to those of the user paper is selected from a plurality of standard papers using the characteristics specified here.

  (3) Based on the correlation between the printer profile 37 generated corresponding to the user paper and a plurality of printer profiles corresponding to the standard paper stored in the printer profile storage unit 35, the user paper and characteristics are Select a standard paper to approximate. This method is disclosed in, for example, Patent Document 2 described above.

  Here, the selection unit 41 selects the Nth standard paper N from among a plurality of preset standard papers (standard paper 1, standard paper 2, standard paper 3,...) As the characteristics of the user paper. In the following description, it is assumed that the selected standard paper is selected.

The conversion table creation unit 42 converts the CMYK image data for standard paper to the user based on the printer profile 35 _N corresponding to the standard paper selected by the selection unit 41 and the printer profile generated for the user paper. A conversion table 38 for converting to CMYK image data for paper is created.

The color conversion table combining unit 43 converts the RGB image data into user paper based on the color conversion table 34 _N corresponding to the standard paper selected by the selection unit 41 and the conversion table 38 created by the conversion table creation unit 42. A color conversion table 39 for conversion into CMYK image data for use is synthesized.

In the present embodiment, the color conversion table combining unit 43 has been described as combining the color conversion table 39 based on the color conversion table 34 _N and the conversion table 38, but the present invention provides color conversion in this way. It is not limited to the case where the table 39 is synthesized.

When the color conversion table 39 is not generated, a color conversion unit (not shown) that performs color conversion of the input RGB image data includes a color conversion table 34 _N corresponding to the standard paper selected by the selection unit 41, and Based on the conversion table 38, the input RGB image data is color-converted into CMYK image data for user paper.

  Next, the operation of the image processing apparatus 33 of this embodiment will be described in detail with reference to the flowchart of FIG.

  First, when a user designates a sheet on which printing is to be performed as a user sheet, a printer profile creation unit (not shown) forms a colorimetric pattern consisting of a plurality of patch images having different gradations for each color on the user sheet. To do. Then, the printer profile creation unit creates a printer profile for the user paper based on the measurement result obtained by measuring the color of the user paper on which the color measurement pattern is formed using a colorimeter (S101).

  Next, the selection unit 41 selects a standard sheet whose characteristics are similar to those of the user sheet, which is a sheet that the user intends to use when outputting images, from a plurality of preset standard sheets (S102). .

Then, the conversion table creation unit 42 generates CMYK image data for standard paper based on the printer profile 35 _N corresponding to the standard paper selected by the selection unit 41 and the printer profile generated corresponding to the user paper. Is converted to CMYK image data for user paper (S103).

Finally, the color conversion table composition unit 43 generates RGB image data based on the color conversion table 34 _N corresponding to the standard paper selected by the selection unit 41 and the conversion table 38 created by the conversion table creation unit 42. Is converted into a CMYK image data for user paper (S104).

  In this way, a color conversion table 39 for converting RGB image data into CMYK image data corresponding to user paper is created, and a color conversion unit (not shown) converts the input RGB image data into this color conversion table. By performing color conversion using 39, CMYK image data for printing on user paper that has not been set as standard paper is obtained.

  According to the image forming apparatus 33 of the present embodiment, a color measurement pattern is actually printed on user paper, and a printer profile 37 for user paper is created based on the measurement result of the color measurement pattern. . The printer profile 37 for user paper and the RGB-CMYK color conversion table 34 for standard paper originally used for paper are synthesized to create an RGB-CMYK color conversion table 39 for user paper. Therefore, it is possible to obtain the color conversion table 39 with high accuracy.

  Therefore, according to the image forming apparatus 33 of the present embodiment, it is possible to perform color conversion with higher accuracy than a simple method in which the profile is corrected based on the difference in the ground color of the paper. .

  Note that, according to the image processing apparatus of the present embodiment, the RGB-CMYK color conversion table stored in the RGB-CMYK color conversion table storage unit 34 is an intent such as emphasizing color reproduction or saturation (intention of color conversion). ), The intent is also reflected in the color conversion table 39 created by the color conversion table composition unit 43.

[Second Embodiment]
Next, the image processing apparatus 33 in the image forming apparatus according to the second embodiment of the present invention will be described.

  In the first embodiment described above, the case where RGB image data is converted into CMYK image data has been described. However, in this embodiment, the case where CMYK image data is converted into CMYK image data will be described. .

  When CMYK image data created for printing on another image forming apparatus such as a printing machine is printed on an image forming apparatus such as a printer different from the target printing machine, CMYK-CMYK color conversion is performed. May be.

  The image processing apparatus 33 according to the present embodiment enables accurate color conversion that matches the characteristics of the user paper even when such CMYK-CMYK color conversion is performed.

  As shown in FIG. 6, the image processing apparatus 33 according to the present embodiment uses a CMYK-CMYK color conversion table 36 instead of the RGB-CMYK color conversion table 34, as compared with the image processing apparatus 33 shown in FIG. Is different.

Further, the color conversion table composition unit 43 in the present embodiment is based on the color conversion table 36 _N corresponding to the standard paper selected by the selection unit 41 and the conversion table 38 created by the conversion table creation unit 42. A color conversion table 40 for converting CMYK image data into CMYK image data for user paper is synthesized.

FIG. 1 is a diagram showing a configuration of an image processing system including an image forming apparatus 10 according to the first embodiment of the present invention. 1 is a diagram illustrating a hardware configuration of an image forming apparatus 10 according to a first embodiment of the present invention. 1 is a block diagram illustrating a functional configuration of an image forming apparatus 10 according to a first embodiment of the present invention. It is a block diagram which shows the structure of the image processing apparatus 33 of the 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the image processing apparatus of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the image processing apparatus 33 of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 14 Network 16 Control bus 18 CPU
19 memory 20 terminal device 22 storage device 24 communication interface (IF)
26 User Interface (UI) Device 28, 28K to 28Y Print Engine 29 Paper Feed Device 30K to 30Y Engine Controller 31 Discharge Device 32 Printer Controller 33 Image Processing Device 34 Color Conversion Table Storage Unit (RGB → CMYK Color Conversion)
35 Printer Profile Storage Unit 36 Color Conversion Table (CMYK → CMYK Color Conversion)
37 Printer Profile (User paper)
38 Conversion table (standard paper CMYK → user paper CMYK)
39 color conversion table (RGB → CMYK for user paper)
40 color conversion table (CMYK → CMYK for user paper)
41 selection unit 42 conversion table creation unit 43 color conversion table composition unit S101 to S104 steps

Claims (9)

First storage means for storing a color conversion table for converting first color system image data into second color system image data for each of a plurality of preset standard sheets;
A second storage means for storing a printer profile of the image output apparatus created on the basis of the measurement result obtained by measuring the color measurement pattern on the paper on which the color measurement pattern is formed , corresponding to the plurality of standard papers; ,
The standard paper of the printer profile that approximates the printer profile of the user paper , which is the paper that the user intends to use at the time of image output, from a plurality of standard papers for which the color conversion table and the printer profile are prepared in advance. A selection means to select;
And a printer profile corresponding to the standard paper selected by the selecting means, based on the printer profile of the image output apparatus that is generated in response to user paper, the image data of the second colorimetric system for standard paper Creating means for creating a conversion table for converting into image data of the second color system for user paper;
Based on the color conversion table corresponding to the standard paper selected by the selecting means and the conversion table created by the creating means, the image data of the first color system is converted into the second color for user paper. A synthesizing unit that synthesizes a color conversion table for converting into system image data;
An image processing apparatus. First storage means for storing a color conversion table for converting first color system image data into second color system image data for each of a plurality of preset standard sheets;
A second storage means for storing a printer profile of the image output apparatus created on the basis of the measurement result obtained by measuring the color measurement pattern on the paper on which the color measurement pattern is formed , corresponding to the plurality of standard papers; ,
The standard paper of the printer profile that approximates the printer profile of the user paper , which is the paper that the user intends to use at the time of image output, from a plurality of standard papers for which the color conversion table and the printer profile are prepared in advance. A selection means to select;
And a printer profile corresponding to the standard paper selected by the selecting means, based on the printer profile of the image output apparatus that is generated in response to user paper, the image data of the second colorimetric system for standard paper Creating means for creating a conversion table for converting into image data of the second color system for user paper;
Based on the color conversion table corresponding to the standard paper selected by the selecting means and the conversion table created by the creating means, the input image data of the first color system is used for the user paper. Color conversion means for converting into image data of the color system of 2;
An image processing apparatus. First storage means for storing a color conversion table for performing color conversion of input image data for each of a plurality of preset standard sheets;
A second storage means for storing a printer profile of the image output apparatus created on the basis of the measurement result obtained by measuring the color measurement pattern on the paper on which the color measurement pattern is formed , corresponding to the plurality of standard papers; ,
The standard paper of the printer profile that approximates the printer profile of the user paper , which is the paper that the user intends to use at the time of image output, from a plurality of standard papers for which the color conversion table and the printer profile are prepared in advance. A selection means to select;
And a printer profile corresponding to the standard paper selected by the selecting means, based on the printer profile of the image output apparatus that is generated in response to user paper, the image data for the standard sheet to the image data for the user paper Creating means for creating a conversion table for conversion;
Color conversion for converting input image data into image data for user paper based on the color conversion table corresponding to the standard paper selected by the selection means and the conversion table created by the creation means A synthesis means for synthesizing the table;
An image processing apparatus. First storage means for storing a color conversion table for performing color conversion of input image data for each of a plurality of preset standard sheets;
A second storage means for storing a printer profile of the image output apparatus created on the basis of the measurement result obtained by measuring the color measurement pattern on the paper on which the color measurement pattern is formed , corresponding to the plurality of standard papers; ,
The standard paper of the printer profile that approximates the printer profile of the user paper , which is the paper that the user intends to use at the time of image output, from a plurality of standard papers for which the color conversion table and the printer profile are prepared in advance. A selection means to select;
And a printer profile corresponding to the standard paper selected by the selecting means, based on the printer profile of the image output apparatus that is generated in response to user paper, the image data for the standard sheet to the image data for the user paper Creating means for creating a conversion table for conversion;
Color conversion means for converting input image data into image data for user paper based on the color conversion table corresponding to the standard paper selected by the selection means and the conversion table created by the creation means; ,
An image processing apparatus. Based on the measurement results of the color measurement pattern imaged to the user paper, any one of claim 1, further comprising a printer profile creation means for creating a printer profile of the image output apparatus corresponding to user paper 4 1 The image processing apparatus according to item. Based on a color conversion table for converting image data of the first color system to image data of the second color system and a measurement result obtained by measuring the color measurement pattern on the paper on which the color measurement pattern is formed. The standard paper of the printer profile that approximates the printer profile of the user paper , which is the paper that the user intends to use at the time of image output, from a plurality of standard papers for which the printer profile of the created image output device is prepared in advance Select
And a printer profile corresponding to the standard paper selected, based on the printer profile of the image output apparatus that is generated in response to user paper, the image data of the second colorimetric system for standard paper for users paper Create a conversion table to convert to image data of the second color system,
Color conversion for converting first color system image data into second color system image data for user paper based on the color conversion table corresponding to the selected standard paper and the created conversion table Method. A printer profile of the image output device created based on the measurement result obtained by measuring the color conversion table for color conversion of the input image data and the color measurement pattern on the paper on which the color measurement pattern is formed is prepared in advance. The standard paper of the printer profile that approximates the printer profile of the user paper that is the paper that the user intends to use for image output is selected from the plurality of standard papers that are
And a printer profile corresponding to the standard paper selected, based on the printer profile of the image output apparatus that is generated in response to user paper, for converting the image data for the standard sheet to the image data for the user paper Create a translation table
A color conversion method for converting input image data into image data for user paper based on a color conversion table corresponding to a selected standard paper and a created conversion table. Based on a color conversion table for converting image data of the first color system to image data of the second color system and a measurement result obtained by measuring the color measurement pattern on the paper on which the color measurement pattern is formed. The standard paper of the printer profile that approximates the printer profile of the user paper , which is the paper that the user intends to use at the time of image output, from a plurality of standard papers for which the printer profile of the created image output device is prepared in advance A step of selecting
And a printer profile corresponding to the standard paper selected, based on the printer profile of the image output apparatus that is generated in response to user paper, the image data of the second colorimetric system for standard paper for users paper Creating a conversion table for converting into image data of the second color system;
Converting the first color system image data into the second color system image data for user paper based on the color conversion table corresponding to the selected standard paper and the created conversion table; ,
A program that causes a computer to execute. A printer profile of the image output device created based on the measurement result obtained by measuring the color conversion table for color conversion of the input image data and the color measurement pattern on the paper on which the color measurement pattern is formed is prepared in advance. Selecting a standard paper of a printer profile that approximates a printer profile of a user paper , which is a paper that the user intends to use when outputting an image, from a plurality of standard papers,
And a printer profile corresponding to the standard paper selected, based on the printer profile of the image output apparatus that is generated in response to user paper, for converting the image data for the standard sheet to the image data for the user paper Creating a translation table;
Converting the input image data into image data for user paper based on the color conversion table corresponding to the selected standard paper and the created conversion table;
A program that causes a computer to execute.

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