JP5116532B2 - Image processing apparatus and image processing method - Google Patents

Description

  The present invention relates to an image processing apparatus and an image processing method, and more particularly to an image processing apparatus and an image processing method for performing color conversion corresponding to an output device on image data composed of a plurality of drawing objects.

  Conventionally, an sRGB color space has been used as a standard color space in output devices such as printers and monitors, but in the future, a color space wider than sRGB, such as AdobeRGB and scRGB, is used for color designation of drawing objects. It is considered to be used when. This is due to the following reasons. For example, the fact that sRGB does not cover the real world colors, that the OS is starting to support extended color spaces such as AdobeRGB and scRGB, and that the digital camera saves image data as values in the AdobeRGB color space. Is providing, etc. In addition, graphic design application software provides a function to save works in the AdobeRGB color space.

  In addition, since the infrastructure for using existing digital contents has been established for editing documents, a plurality of contents having different color spaces are mixed in one document or one page.

In order to cope with such a situation, for example, the color reproduction range of an image included in a document to be printed or each drawing data is dynamically calculated, and an appropriate output signal profile is dynamically selected for each Thus, there is a technique for performing color correction (see, for example, Patent Document 1). According to this technique, it is possible to perform optimum color correction on a plurality of images or drawing data existing in a document or page.
JP 2007-166403 A

  However, according to the above-described conventional color correction technology, in order to perform optimum color correction for each of the image or drawing data mixed in the document or page, the color between the images or drawing data cannot be maintained. There is. For this reason, for example, the phenomenon that the output colors of pixels having the same RGB value ((R, G, B) = (200, 200, 200), etc.) are different between the image A and the image B occurs. .

  SUMMARY An advantage of some aspects of the invention is to provide an image processing apparatus and an image processing method having the following functions. In other words, when performing appropriate color conversion according to the output device for image data composed of a plurality of drawing objects, variation in color for each drawing object is suppressed.

  As a means for achieving the above object, the image processing method of the present invention comprises the following steps.

That is, an image processing method performed by an image processing apparatus that performs color conversion according to an output device on image data including a plurality of drawing objects,
A unit selection step in which the unit selection means of the image processing apparatus selects a color conversion optimization unit based on a user instruction;
Color gamut acquisition means of the image processing apparatus, for the plurality of drawing objects, and color gamut obtaining step of obtaining respective input gamut,
The summing unit of the image processing apparatus groups the input color gamuts of the plurality of drawing objects acquired in the color gamut acquisition step by the optimization unit selected in the unit selection step, and for each group, the group A summation step of calculating a summation color gamut including the input color gamut within
A color conversion step in which the color conversion means of the image processing apparatus performs color conversion with color gamut compression based on the combined color gamut calculated for the group to which the input color gamut of the drawing object belongs , for each of the plurality of drawing objects; ,
It is characterized by having.

  According to the present invention having the above-described configuration, variation in color for each drawing object is suppressed when performing appropriate color conversion according to the output device for image data including a plurality of drawing objects.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the accompanying drawings. The configurations shown in the following embodiments are merely examples, and the present invention is not limited to the illustrated configurations.

<First Embodiment>
In this embodiment, when performing color correction (hereinafter referred to as color conversion) according to an output device using an output signal profile, a user can select an optimization unit for color conversion, It is characterized by determining an appropriate output signal profile. Hereinafter, the configuration of the present embodiment will be described in detail.

System Configuration In the printing system according to the present embodiment, one or a plurality of PCs and printers are connected to a network. FIG. 1 shows a configuration example of a print system in the present embodiment. As shown in the figure, this embodiment shows an example in which PCs 101 and 102 and printers 103 and 104 are connected to a network. In the following, an example in which the characteristic processing of this embodiment is performed on the PC side will be described, but this processing can also be performed on the printer side.

  FIG. 2 shows a hardware configuration of the PC 101 or PC 102 (hereinafter simply referred to as PC) in the present embodiment. As a hardware configuration of a PC, various connection methods and configurations having various buses and interfaces are generally known, and the hardware configuration introduced here is only an example.

  In FIG. 2, a portion surrounded by a dotted line is a mother board 200, and the configuration of the mother board 200 will be described below. The CPU 201 controls the entire software of the client PC while communicating with the north bridge 203 and the south bridge 204 via the cache memory 202. Here, a memory (RAM) 207 is used for the exchange of data between the north bridge 203 and the south bridge 204 and the primary storage of data inside the client PC.

  The north bridge 203 has a general-purpose PCI bus 208, and can connect an SCSI external device or the like as an option (retrofit). The north bridge 203 is also connected to a graphic controller 206 for displaying the display 212.

  Further, the south bridge 204 has another general-purpose PCI bus 210, which can be connected to the network via the NIC 217. The south bridge 204 also has an IDE bus 209 to which a hard disk drive (HDD) 214 for storing various data including PC control software is connected. The IDE bus 209 also has a CD-ROM (or CD-R, CD-R / W) drive 213, which is used for data reading at the time of installation of a client PC and data storage (archive) of a large amount of data. Is also connected. Further, the USB port 211 can access a USB external device 214 typified by a USB memory.

  Then, it is connected to a keyboard 218, a mouse 219, or a floppy (registered trademark) disk drive (F / D drive) 216 via the I / O unit 205, and can input and output data.

  FIG. 3 is a block diagram showing a characteristic functional configuration of, for example, the PC 101 according to the present embodiment. The configuration shown in FIG. 3 and the PC 102 can be similarly realized.

  In FIG. 3, a PC 101 receives input data (mainly PDL) 301 and user setting information 302 and converts them into output data 308 that can be interpreted by the printer.

  In the PC 101, reference numeral 303 denotes an input data processing unit that analyzes input data. A color conversion parameter determination processing unit 304 finally determines parameters for color conversion (input / output color space, color space compression method, and the like), and is a characteristic configuration of the present embodiment. Note that the color conversion parameter determination processing unit 304 determines the color conversion parameter using the user setting information 302 and the output signal profile information 307. A color conversion processing unit 305 performs color conversion using the color conversion parameters determined by the color conversion parameter determination processing unit 304. Reference numeral 306 denotes an output data generation unit that converts the input data 301 analyzed by the input data processing unit 303 into output data 308 that can be interpreted by the printer.

  Hereinafter, each data and each process in this embodiment will be described in detail.

Input Data First, the input data 301 will be described. FIG. 4 shows an example of the input data 301. In FIG. 4, the first line indicates that the output data size is 200 width and 200 height, the second line, the third line, and the fourth line indicate each drawing object. For example, the drawing object shown in the third line is a drawing object that is filled with the color (1, 0, 0) in the color space scRGB, and is a rectangle with a width of 20 and a height of 20 from the start position (40, 10). It is shown that.

User Setting Information Next, the user setting information 302 will be described. FIG. 5 shows an example UI for setting the user setting information 302. According to FIG. 5, as a unit for optimizing color conversion, either “optimize by document” indicating a document unit or “optimize by object” indicating an object unit can be selected by buttons 501 and 504. . When the former is selected, either “optimize for each page” indicating the page unit or “optimize for each object type” indicating the object type unit is optionally selected by the check boxes 502 and 503. be able to. If neither option is selected, "optimize with document" is assumed.

  As described above, in the user setting information 302 according to the present embodiment, a unit selection result according to a user instruction is set. The timing of this setting is as follows: when a user creates a document, when a document is displayed, or when a document is printed Time, etc. can be considered.

Output signal profile information Next, the output signal profile information 307 will be described. As the output signal profile information 307 of this embodiment, a plurality of output signal profiles are registered according to variations in the color gamut of the input color signal.

Input Data Processing Next, the input data processing unit 303 will be described. FIG. 6 is a block diagram showing an input / output configuration in the input data processing unit 303. As shown in FIG. 6, the input data processing unit 303 analyzes the input data 301 described above, thereby rendering a drawing object list. 401 is created.

  The drawing object list 401 has a format shown in FIG. As shown in FIG. 7, the drawing object list 401 includes input signal profile information / color space compression method information / object type / input color value / page number / other drawing information / output signal for all objects in the document. Profile. The input signal profile information includes information for specifying the input signal profile, such as profile path information, based on the input data 301. The color space compression method information is information for determining a color space compression method at the time of color conversion, and a character string such as “Perceptual” is entered based on the input data 301. The input color value contains a numerical value such as “128, 128, 128” when the object type is Graphics or Text (multiple numerical values when expressing gradation), and to the image file when the object type is Image. Contains path information for The page number is the page number where the object exists. The other drawing information is information such as a rectangle and a size necessary for drawing, but the details thereof are omitted because the involvement in the present invention is small.

  As described above, at the time when the processing in the input data processing unit 303 is completed, the input signal profile / color space compression method information / object type / input color value / page number / other drawing information in the drawing object list 401 are as follows. The part is determined. That is, the output signal profile in the drawing object list 401 is determined by subsequent processing.

Color Conversion Parameter Determination Processing Next, the color conversion parameter determination processing unit 304 will be described. FIG. 8 is a block diagram showing an input / output configuration in the color conversion parameter determination processing unit 304, which is a characteristic configuration of the present embodiment. The color conversion parameter determination processing unit 304 receives user setting information 302, a drawing object list 401 created by the input data processing unit 303, and output signal profile information 307. Then, the drawing object list 401 is updated and output as the drawing object list 402. The data updated here is an output signal profile field in the drawing object list 401.

  As described above, in the output signal profile information 307 in the present embodiment, a plurality of output signal profiles corresponding to the color gamut of the input color signal are registered. The color conversion parameter determination processing unit 304 selects and determines an output signal profile to be set in the drawing object list 401 from the plurality of output signal profiles.

  Hereinafter, color conversion parameter determination processing, that is, output signal profile determination processing in the present embodiment will be described with reference to FIG.

  First, step S1701 is a unit information acquisition step of color conversion optimization, and the user setting information 302 is read. If “optimization in units of objects” is set as the unit information, the process proceeds to the individual object processing in step S1702. Since the individual object processing is well known, the description thereof is omitted here.

  If “optimization by document” is set as unit information but “optimization for each page” is not set, the process proceeds to an output signal profile selection process in step S1703.

  If “optimize by document” is set as the unit information and “optimize for each page” is also set, the drawing object list 401 is divided for each page in step S1704, and drawing of each page is performed. Generate an object list. Then, an output signal profile selection process in step S1705 is performed on the drawing object list of each page. Although details will be described later, the output signal profile selection processing in step S1703 and the output signal profile selection processing in step S1705 are performed in the same manner. Thereafter, in step S1706, the drawing object list divided for each page is integrated.

  Here, the output signal profile selection processing in step S1703 and step S1705 will be described in detail with reference to the flowchart of FIG.

  First, step S1801 is a drawing object acquisition step, in which one drawing object is acquired from the drawing object list 401.

  Next, step S1802 is an input color gamut calculation step. That is, by using the input color value information and the input signal profile information in the drawing object acquired in step S1801, the input color value is converted into a device-independent color space (for example, Lab space), so that the color gamut information of the input color is obtained. Ask for. The color gamut information obtained here is a set of values obtained by converting the colors used by the drawing object into a device-independent color space.

  Next, step S1803 is an output signal profile color gamut acquisition step, in which one output signal profile is extracted from the output signal profile information 307 and the color gamut information is acquired. The output signal profile is taken out in ascending order of the color gamut. The obtained color gamut information is a set of device-independent color space values that match the device color grid points of the profile.

  Next, step S1804 is a color gamut comparison step, in which the input color gamut obtained in step S1802 is compared with the output signal profile color gamut obtained in step S1803. As this comparison, both color gamuts are expressed in three dimensions in a device-independent color space, and the size of the convex hulls is compared.

  The output signal profile color gamut acquisition and color gamut comparison processing in steps S1803 and S1804 described above are repeated until the output signal profile color gamut becomes larger than the input color gamut. As a result, an output signal profile having the most effective color gamut for the drawing object acquired in step S1801 is selected.

  Thereafter, if “processing by object type” is set as the unit information acquired in step S1701 of FIG. 9, the process proceeds to step S1805. In step S1805, the information of the output signal profile having the optimum color gamut read last in step S1803 is set in the object type-output signal profile table having the format shown in FIG.

  On the other hand, if “processing by object type” is not set as the unit information acquired in step S1701 of FIG. 9, the process proceeds to step S1806. In step S1806, the information of the output signal profile having the optimum color gamut read last in step S1803 is set in the document-output signal profile table having the format shown in FIG.

  The above steps S1801 to S1806 are repeated for all objects. As a result, either an object type-output signal profile table or a document-output signal profile table is created depending on whether "processing by object type" is set as unit information. If these profile tables are, for example, a document-output signal profile table, only one output signal profile is finally set. This is because an output signal profile larger than the input color gamut is selected for the drawing object having the largest input color gamut. That is, the output color gamut acquisition and the color gamut comparison are performed only when the newly calculated input color gamut becomes larger than the already calculated input color gamut. Of course, in the case of the object type-output signal profile table, one output signal profile is set for each object type.

  Finally, when there are no more objects to be read in step S1801, the drawing object list 401 is updated in step S1807, and the drawing object list 402 is created. That is, when the object type-output signal profile table shown in FIG. 11 exists, the output signal profile of the drawing object list 401 is updated with reference to the object type and output signal profile described in the table. On the other hand, if the object type-output signal profile table does not exist, the output signal profile of the drawing object list 401 is updated with reference to the document-output signal profile table shown in FIG.

  As a result, when “processing by object type” is set as the unit information, the field of the output signal profile in the drawing object list 401 is updated for each object type. On the other hand, if “processing by object type” is not set, the field of the output signal profile in the drawing object list 401 is uniformly updated.

  As described above, in the present embodiment, the color gamuts of a plurality of drawing objects existing in a document are grouped in a set optimization unit, and an appropriate output signal profile is selected for each group.

Color Conversion Processing Next, the color conversion processing unit 305 will be described. FIG. 13 is a block diagram illustrating an input / output configuration in the color conversion processing unit 305. In FIG. 13, reference numeral 601 denotes an input color, which is a value or image information set in the updated drawing object list 402. An input color processing unit 602 converts the input color 601 into a device-independent color space using an input signal profile set in the drawing object list 402. An output color processing unit 603 converts the input color converted into the device-independent color space using the color space compression method information and the output signal profile set in the drawing object list 402 into a device-dependent color space. Conversion to output color 604 is performed. Then, the input color value field in the drawing object list 402 is updated with the output color 604.

Output Data Generation Next, the output data generation unit 306 will be described. The output data generation unit 306 generates output data 308 that can be interpreted by the printer, based on the drawing object list 402 converted as described above.

  As described above, according to the present embodiment, an output signal profile having an optimal output color gamut can be set for each type of drawing object or for each document as an optimization unit for color conversion. As a result, it is possible to suppress a variation in color for each drawing object that has occurred in the color conversion optimization process, and to realize preferable color reproduction.

Second Embodiment
Hereinafter, a second embodiment according to the present invention will be described. In the first embodiment described above, an example in which a plurality of output signal profiles are prepared according to the color gamut of the input signal has been shown. However, in the second embodiment, the output signal profile does not depend on the color gamut of the input signal. It is characterized by. The system configuration in the second embodiment is the same as the configuration shown in FIGS. 1 and 2 in the first embodiment described above. Also, with regard to each data and each process in the second embodiment, description of the same data as in the first embodiment described above will be omitted, and only different processes will be described below.

  FIG. 14 is a block diagram showing a characteristic functional configuration of a PC in the second embodiment. The same reference numerals are given to the same components as those in FIG. 3 in the first embodiment described above, and the description thereof will be omitted.

  In the first embodiment described above, an example is shown in which a plurality of output signal profiles are registered in the output signal profile information 307. However, only one output signal profile is included in the output signal profile information 307 in the second embodiment. Is registered. Information from the output signal profile information 307 is input not to the color conversion parameter determination processing unit 304 but to the input data processing unit 303.

Input Data Processing The input data processing unit 303 in the second embodiment will be described. The input / output configuration in the input data processing unit 303 is shown in FIG. 6 as in the first embodiment described above, but the format of the output drawing object list 401 is different. The drawing object list 401 in the second embodiment has a format shown in FIG. As shown in FIG. 15, the drawing object list 401 is the same as the input signal profile information / color space compression method information / object type / input color value / page number / other drawing information / output signal as in FIG. 7 of the first embodiment. In addition to the profile, it further has color gamut information.

  The information on the input signal profile and the output signal profile includes information for specifying each profile such as profile path information. The color space compression method information is information for determining a color space compression method at the time of color conversion, and includes, for example, a path of a module that performs color space compression such as “Perceptual.dll”. The input color value contains a numerical value such as “128, 128, 128” when the object type is Graphics or Text (multiple numerical values when expressing gradation), and to the image file when the object type is Image. Contains path information for The page number is the page number where the object exists. The other drawing information is information such as a rectangle and a size necessary for drawing, but the details thereof are omitted because the involvement in the present invention is small.

  As described above, when the processing in the input data processing unit 303 ends, all items other than the color gamut information are determined in the drawing object list 401, and the color gamut information is determined by the subsequent processing.

Color Conversion Parameter Determination Processing Next, the color conversion parameter determination processing unit 304 in the second embodiment will be described. Also in the second embodiment, the color conversion parameter determination processing unit 304 inputs user setting information 302 and a drawing object list 401 as shown in FIG. Then, the drawing object list 401 is updated and output as the drawing object list 402. The data updated here is a color gamut information field in the drawing object list 401.

  Hereinafter, the color conversion parameter determination process in the second embodiment, that is, the color gamut information determination process will be described with reference to FIG.

  First, step S1901 is a unit information acquisition step for color conversion optimization, in which user setting information 302 is read. If “optimization in units of objects” is set as the unit information, the process ends without doing anything here.

  If “optimization by document” is set as the unit information and “optimization for each page” is not set, the process proceeds to the input color gamut summing process in step S1902.

  If “optimize by document” is set as unit information and “optimize for each page” is also set, the drawing object list 401 is divided for each page in step S1903, and the drawing objects of each page are set. Generate a list. Then, the input color gamut summing process of step S1904 is performed on the drawing object list of each page. Note that the input color gamut summing process in step S1902 is the same as the input color gamut summing process in step S1904. In step S1905, the drawing object list divided for each page is integrated.

  Here, the input color gamut summing process in step S1902 and step S1904 will be described in detail with reference to the flowchart of FIG.

  First, step S2001 is a drawing object acquisition step, in which one drawing object is acquired from the drawing object list 401. Next, step S2002 is an input color gamut calculation step. That is, by using the input color value information and the input signal profile information in the drawing object acquired in step S2001, the input color value is converted into a device-independent color space (for example, Lab space), so that the color gamut information of the input color is obtained. Ask for. The color gamut information obtained here is a set of values obtained by converting the colors used by the drawing object into a device-independent color space.

  Next, if “processing by object type” is set as the unit information acquired in step S1901 in FIG. 16, the process proceeds to step S2003. In step S2003, the object type color gamut information matching the drawing object currently processed is loaded from the object type-color gamut information table having the format shown in FIG. Note that this object type-color gamut information table does not yet exist at the time of the first drawing object process, and in this case, the process of step S2003 is skipped.

  On the other hand, if “processing by object type” is not set as the unit information acquired in step S1901 in FIG. 16, the process proceeds to step S2004, and from the document-gamut information table having the format shown in FIG. Load gamut information. Note that this document-color gamut information table does not yet exist at the time of the first drawing object process, and in this case, the process of step S2004 is skipped.

  In step S2005, the color gamut information of the input color calculated in step S2002 and the color gamut information loaded in step S2003 or step S2004 are added together. As a result, the input color gamuts of all the objects to be processed are added together, and the maximum color gamut information (total color gamut) including all the input color gamuts is obtained as the optimum color gamut information in the object group.

  If “processing by object type” is set as the unit information, in step S2006, the color gamut information added in step S2005 is stored in the object type-color gamut information table. On the other hand, if “processing by object type” is not set, the color gamut information added in step S2005 is stored in the document-color gamut information table in step S2007.

  The processes in steps S2001 to S2007 are repeated for all objects, and when there is no object to be finally read, the drawing object list 401 is updated in step S2008 to create the drawing object list 402. That is, when the object type-color gamut information table shown in FIG. 18 exists, the color gamut information in the drawing object list 401 is updated with reference to the object type and color gamut information described in the table. On the other hand, when the object type-output signal profile table does not exist, the color gamut information of the drawing object list 401 is updated with reference to the document-color gamut information table shown in FIG.

  Thereby, when “processing by object type” is set as the unit information, the field of the color gamut information in the drawing object list 401 is updated for each object type. On the other hand, when “processing by object type” is not set, the field of color gamut information in the drawing object list 401 is uniformly updated.

Color Conversion Processing Next, the color conversion processing unit 305 in the second embodiment will be described. FIG. 20 is a block diagram illustrating an input / output configuration of the color conversion processing unit 305 according to the second embodiment. In FIG. 20, reference numeral 701 denotes an input color, which is a value or image information set in the updated drawing object list 402. An input color processing unit 702 converts an input color 701 into a device-independent color space using an input signal profile set in the drawing object list 402. A color gamut compression unit 703 performs color gamut compression using output color gamut information determined from color space compression method information, color gamut information, and an output signal profile set in the drawing object list 402. . If the gamut information is not set in the drawing object list 402, the gamut information is obtained from the input signal profile specified in the drawing object list 402 and used. An output color processing unit 704 converts an input color compressed in a device-independent color space into a device-dependent output color 705 using an output signal profile set in the drawing object list 402. . Then, the input color value field in the drawing object list 402 is updated with the output color 705.

  As described above, according to the second embodiment, for each drawing object or each document, the maximum color gamut including all objects is calculated as the input color gamut, and color gamut compression based on this is performed. it can. As a result, it is possible to suppress a variation in color for each drawing object that has occurred in the color conversion optimization process, and to realize preferable color reproduction.

  In the second embodiment, an example is shown in which only one output signal profile is prepared in advance, but it is also effective to prepare a plurality of output signal profiles in advance, as in the first embodiment described above. . In other words, an optimum output signal profile may be selected and determined for the color gamut summation results of all objects.

<Modification>
In the first embodiment and the second embodiment described above, an example in which the processing contents in the color conversion parameter determination processing unit 304 and the color conversion processing unit 305 are different has been shown, but these two types of processing are used properly on one system. It is also possible.

  For example, this usage can be realized as follows. First, as the user setting information 302, whether to perform the process of the first embodiment or the process of the second embodiment by using the UI shown in FIG. 21 in addition to the UI shown in FIG. Are selected by the user. That is, the button 1601 shown in FIG. 21 selects the color interpolation processing in which a plurality of output signal profiles are prepared for the color gamut variations of the input signal shown in the first embodiment. On the other hand, the button 1602 selects the color interpolation processing whose output signal profile does not depend on the color gamut variation of the input signal, as shown in the second embodiment. Then, in accordance with the selection in the UI shown in FIG. 21, it is only necessary to determine which of the above two types of processing is performed in the color conversion parameter determination processing unit 304 and the color conversion processing unit 305.

  As described above, the color conversion process in the first and second embodiments can be selectively executed, so that the user can select the basic method of color conversion when performing color conversion according to the output device. This enables more flexible color conversion.

  In the above-described second embodiment, an example in which one output signal profile is set in advance has been described. However, from the input color gamut obtained by summing, a plurality of output signal profiles can be obtained as in the first embodiment. An optimum one may be selected.

<Other embodiments>
The present invention can take the form of, for example, a system, apparatus, method, program, or storage medium (recording medium). Specifically, the present invention may be applied to a system composed of a plurality of devices (for example, a host computer, an interface device, a photographing device, a web application, etc.), or may be applied to a device composed of one device. good.

  The present invention also provides a software program that implements the functions of the above-described embodiments directly or remotely to a system or apparatus, and the system or apparatus computer reads out and executes the supplied program code. Achieved. The program in this case is a computer-readable program corresponding to the flowchart shown in the drawing in the embodiment.

  Accordingly, since the functions of the present invention are implemented by computer, the program code installed in the computer also implements the present invention. In other words, the present invention includes a computer program itself for realizing the functional processing of the present invention.

  In that case, as long as it has the function of a program, it may be in the form of object code, a program executed by an interpreter, script data supplied to the OS, or the like.

  Recording media for supplying the program include the following media. For example, floppy disk, hard disk, optical disk, magneto-optical disk, MO, CD-ROM, CD-R, CD-RW, magnetic tape, nonvolatile memory card, ROM, DVD (DVD-ROM, DVD- R).

  As a program supply method, the following method is also possible. That is, the browser of the client computer is connected to a homepage on the Internet, and the computer program itself (or a compressed file including an automatic installation function) of the present invention is downloaded to a recording medium such as a hard disk. It can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different homepage. That is, a WWW server that allows a plurality of users to download a program file for realizing the functional processing of the present invention on a computer is also included in the present invention.

  In addition, the program of the present invention is encrypted, stored in a storage medium such as a CD-ROM, distributed to users, and key information for decryption is downloaded from a homepage via the Internet to users who have cleared predetermined conditions. It is also possible to make it. That is, the user can execute the encrypted program by using the key information and install it on the computer.

  Further, the functions of the above-described embodiments are realized by the computer executing the read program. Furthermore, based on the instructions of the program, an OS or the like running on the computer performs part or all of the actual processing, and the functions of the above-described embodiments can also be realized by the processing.

  Further, the program read from the recording medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, and then executed, so that the program of the above-described embodiment can be obtained. Function is realized. That is, based on the instructions of the program, the CPU provided in the function expansion board or function expansion unit can perform part or all of the actual processing.

1 is a diagram illustrating a configuration example of a print system according to a first embodiment. It is a figure which shows the hardware structural example of PC in 1st Embodiment. It is a block diagram which shows the characteristic function structure of PC in 1st Embodiment. It is a figure which shows an example of the input data in 1st Embodiment. It is a figure which shows an example of the unit determination UI of the color conversion optimization in 1st Embodiment. It is a block diagram which shows the input-output structure of the input data processing part in 1st Embodiment. It is a figure which shows the example of a format of the drawing object list in 1st Embodiment. It is a block diagram which shows the input / output structure of the parameter determination process part for color conversion in 1st Embodiment. It is a flowchart which shows the parameter determination process for color conversion in 1st Embodiment. It is a flowchart which shows the output signal profile selection process in 1st Embodiment. It is a figure which shows the example of a format of the object type-output signal profile table in 1st Embodiment. It is a figure which shows the example of a format of the document-output signal profile table in 1st Embodiment. It is a block diagram which shows the input-output structure of the color conversion process part in 1st Embodiment. It is a block diagram which shows the characteristic function structure of PC in 2nd Embodiment. It is a figure which shows the example of a format of the drawing object list in 2nd Embodiment. It is a flowchart which shows the parameter determination process for color conversion in 2nd Embodiment. It is a flowchart which shows the input color gamut summing process in 2nd Embodiment. It is a figure which shows the example of a format of the object type-color gamut information table in 2nd Embodiment. It is a figure which shows the example of a format of the document-color gamut information table in 2nd Embodiment. It is a block diagram which shows the input-output structure of the color conversion process part in 2nd Embodiment. It is a figure which shows an example of the color conversion system determination UI in a modification.

Claims (4)

An image processing method performed by an image processing device that performs color conversion according to an output device on image data composed of a plurality of drawing objects,
A unit selection step in which the unit selection means of the image processing apparatus selects a color conversion optimization unit based on a user instruction;
Color gamut acquisition means of the image processing apparatus, for the plurality of drawing objects, and color gamut obtaining step of obtaining respective input gamut,
The summing unit of the image processing apparatus groups the input color gamuts of the plurality of drawing objects acquired in the color gamut acquisition step by the optimization unit selected in the unit selection step, and for each group, the group A summation step of calculating a summation color gamut including the input color gamut within
A color conversion step in which the color conversion means of the image processing apparatus performs color conversion with color gamut compression based on the combined color gamut calculated for the group to which the input color gamut of the drawing object belongs , for each of the plurality of drawing objects; ,
An image processing method comprising: Further, a profile selection step in which the profile selection means of the image processing apparatus selects, for each group, an output signal profile from a plurality of output signal profiles prepared in advance for the sum color gamut obtained in the summation step for the group. Have
In the color conversion step, for each of the plurality of drawing objects , color conversion is performed using the output signal profile selected in the profile selection step for a group to which the input color gamut of the drawing object belongs. The image processing method according to claim 1. An image processing device that performs color conversion according to an output device on image data composed of a plurality of drawing objects,
Unit selection means for selecting an optimization unit for color conversion based on a user instruction;
For the plurality of drawing objects, color gamut acquisition means for acquiring respective input color gamuts;
The input color gamuts of the plurality of drawing objects acquired by the color gamut acquisition unit are grouped by the optimization unit selected by the unit selection unit, and each group includes the input color gamut within the group. A summing means for calculating a color gamut;
For each of the plurality of drawing objects , color conversion means for performing color conversion with color gamut compression based on a combined color gamut calculated for a group to which the input color gamut of the drawing object belongs ;
An image processing apparatus comprising: A program for causing a computer to execute each step of the image processing method according to claim 1 .

Images