JP2011228987A - Image processing apparatus and image processing program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce data amount for generating image data from a PDL print job and to reduce image expansion time and image processing time.SOLUTION: An image processing apparatus includes: input means for inputting a print job including data on a page description language; first storage means for storing the inputted print job; image expansion means for reading out the print job from the first storage means to analyze it and generating image data as well as tag bit data showing object attributes for individual elements of the image data; and second storage means for storing the image data and the tag bit data. The image expansion means determines object attributes of individual objects included in the data on the page description language when analyzing the print job, and determines whether to generate tag bit data according to a type of the object attributes. When the tag bit data is determined not to be generated, the image expansion means generates only image data.

Description

  The present invention relates to an image processing apparatus and an image processing program, and more particularly to an image processing apparatus having a function of generating attribute data indicating an object attribute included in image data and an image processing program that operates on the image processing apparatus.

  A multi-function machine (hereinafter referred to as an image forming apparatus) having a copy function, a printer function, a scanner function, and the like is widely used. When printing using this image forming apparatus, first, a print job in a page description language (PDL) format is received from a client connected to the network, and the print job is rasterized (image development). Image data for each page is generated, and the image data is subjected to image processing such as thinning, smoothing, gradation correction, screening, and the like, and output to a paper medium.

  In the case of a system in which a plurality of image forming apparatuses are connected via a network, when each image forming apparatus executes processing (RIP (Raster Image Processor) processing) or image processing for generating image data from a print job, The image forming apparatus must have a function of executing the above processing, and the configuration of the image forming apparatus becomes complicated. Therefore, in such a system, an image processing apparatus (so-called printer controller) having the above RIP processing function and image processing function is connected to a network, and the above processing is representatively performed by the image processing apparatus.

  Here, the object attributes constituting the image data include characters, graphics, photographs, and the like. For example, for the object of the character attribute or the object of the graphics attribute, smoothing, thinning process, Print images with higher image quality by applying halftone processing and image processing according to each object attribute, such as gradation correction processing and halftone processing with emphasis on gradation. It can be performed.

  In order to perform different image processing according to such object attributes, it is necessary to specify the object attributes included in the image data, so printing based on a print job described in a page description language such as PostScript. When the image is developed, attribute data (hereinafter referred to as tag bit data) indicating the object attribute is output together with the pixel unit corresponding to the image data. In the stage of performing image processing, a method is used in which an object attribute is detected with reference to tag bit data for a pixel to be processed, and processing corresponding to the object type is performed on the image data of the pixel. .

  However, since the tag bit data is information in units of pixels and has a large amount of data, a large-capacity memory is required, and image development time and image processing time become long, and printing cannot be executed quickly. There is a problem.

  In order to solve this problem, the following Patent Document 1 discloses an input unit that inputs a file in which image data is described in a known format, a developing unit that interprets the input file and develops it into image data, and the image A first storage unit that stores data; an attribute information generation unit that generates a tag bit indicating an attribute of an image element included in the image data in units of pixels; and a tag bit string for a plurality of continuous pixels. Replacement means for replacing the bit string with tag data unique to the bit arrangement, compression means for encoding and compressing the data string of each tag data, and second storage means for storing the compressed tag data string Decompressing means for decompressing the stored tag data string to reproduce tag bits, and outputting each of the reproduced tag bits in association with the stored image data The image processing apparatus is disclosed which includes a data output means.

Japanese Patent Laid-Open No. 11-185024

  In the technique of Patent Document 1, the tag bits are packed and compressed for each of a plurality of pixels, so that the data amount can be reduced. However, with this technique, since it is necessary to perform compression processing and expansion processing, processing time increases, and there is a problem that printing cannot be performed quickly.

  The present invention has been made in view of the above-described problems, and its main purpose is to reduce the amount of data when generating image data to be printed from a PDL print job, as well as image development time and image processing. An object is to provide an image processing apparatus and an image processing program capable of reducing time.

  In order to achieve the above object, the present invention provides an input unit for inputting a print job including page description language data, a first storage unit for storing the print job input from the input unit, and the first An image expansion unit that reads out and analyzes the print job from the storage unit to generate image data, and generates tag bit data indicating an object attribute for each pixel of the image data; and the image data and the tag bit data And an image processing apparatus having at least a second storage unit for storing the image, wherein the image development unit determines an object attribute of each object included in the page description language data when the print job is analyzed, It is determined whether to generate the tag bit data according to the type of the object attribute, and the tag bit data is generated. The image processing unit generates only the image data, reads out the image data and the tag bit data from the second storage unit, performs predetermined image processing, and further outputs an image processing unit. The image development unit notifies the image processing unit of the tag bit data presence / absence information and the object attribute type information, and the image processing unit includes the tag bit data presence / absence information and the object attribute information. With reference to the type information, for the image data in which the tag bit data is generated, image processing based on tag bit data corresponding to the pixel is performed for each pixel, and the image in which the tag bit data is not generated For data, image processing corresponding to the type of object attribute specified for the entire image data is applied to each pixel of the image data. It can be cormorants configuration.

  The present invention is also an image processing program that operates on an apparatus for processing a print job including page description language data, and is obtained by analyzing the print job and developing the image of the print job. Determine the object attribute of each object included in the image data and generate tag bit data indicating the object attribute for each pixel of the image data and the image data according to the type of the object attribute, or only the image data And the generated data is stored in the storage unit or functions as an image development unit that transmits the data to a printing device connected to the device, and the device further reads data from the storage unit, For image data for which tag bit data has been generated, for each pixel, a tag bit corresponding to that pixel For image data for which the tag bit data has not been generated, image processing corresponding to the type of object attribute specified for the entire image data is applied to each pixel of the image data. It can be configured to function as an image processing unit to be performed.

  According to the image processing apparatus and the image processing program of the present invention, it is possible to reduce the amount of data when generating image data to be printed from a PDL print job, and to reduce the image development time and the image processing time. .

  The reason is that the image development unit provided in the image processing apparatus determines the object attribute included in the image data at the time of image development, determines whether to generate the tag bit data according to the type of the object attribute, This is because when it is determined that no bit data is generated, only image data is generated.

  In addition, the image processing unit provided in the image processing apparatus or the image forming apparatus performs image processing based on the tag bit data for each pixel for the image data for which the tag bit data has been generated to generate the tag bit data. This is because image processing that is not performed is performed on the entire image data according to the type of object attribute included in the image data.

1 is a diagram schematically showing a configuration of an image processing system according to an embodiment of the present invention. It is a block diagram which shows the structure of the image processing apparatus (when an image processing part is included) which concerns on one Example of this invention. It is a block diagram which shows the structure of the image processing apparatus (when an image processing part is not included) which concerns on one Example of this invention. It is a block diagram which shows the process of an image expansion part and an image process part. It is a figure which shows an example of the parameter information of image data. It is a flowchart figure which shows the procedure of the image expansion process which concerns on one Example of this invention. It is a flowchart figure which shows the procedure of the PDL analysis process based on one Example of this invention. It is a flowchart figure which shows the procedure of the drawing process which concerns on one Example of this invention. It is a flowchart figure which shows the procedure of the image processing which concerns on one Example of this invention. It is a flowchart figure which shows the procedure of the image expansion process (job unit) based on one Example of this invention. It is a flowchart figure which shows the procedure of the PDL analysis process (job unit) based on one Example of this invention. It is a flowchart figure which shows the procedure of the drawing process (job unit) based on one Example of this invention. It is a flowchart figure which shows the procedure of the image processing (job unit) based on one Example of this invention. It is a flowchart figure which shows the procedure of the image expansion process (band unit) based on one Example of this invention. It is a flowchart figure which shows the procedure of the PDL analysis process (band unit) based on one Example of this invention. It is a flowchart figure which shows the procedure of the drawing process (band unit) based on one Example of this invention. It is a flowchart figure which shows the procedure of the image process (band unit) based on one Example of this invention. It is a figure explaining the relationship between image data and a tag bit.

  As shown in the background art, by performing image processing according to the object attribute included in the image data, it is possible to perform higher-quality printing, so when developing an image of a print job described in a page description language A method is used in which tag bit data indicating object attributes in units of pixels is output together and processing for each object is performed while referring to the tag bit data.

  The tag bit data is data indicating an object attribute for each pixel of image data. For example, as shown in FIG. 18A, in image data in which objects of a photo attribute, a graphics attribute, and a character attribute are mixed, When the photo attribute is defined as 1 (bit 0), the graphics attribute is defined as 2 (bit 1), and the character attribute is defined as 4 (bit 2), the tag bit data is as shown in FIG. By referring to the tag bit data at the time of image processing, it is possible to know what attribute each pixel of the image data has, so that it is possible to perform optimal image processing for each object.

  However, since the tag bit data is information in units of pixels, there is a problem that the amount of data is large, a large-capacity memory is required, and image development time and image processing time are long.

  Therefore, in one embodiment of the present invention, the image processing apparatus (printer controller) determines the object attribute included in the image data during the image development process, and requires different image processing according to the type of the object attribute. Determine whether to generate tag bit data (depending on whether it contains objects with multiple attributes). For example, in the case of only a photograph attribute object or only a character attribute and / or graphics attribute object, it is determined that generation of tag bit data is unnecessary, and only image data is generated.

  The image processing apparatus performs image processing based on tag bit data for each pixel for image data for which tag bit data has been generated, and for image data for which tag bit data has not been generated, Image processing corresponding to the type of object attribute specified for the entire image data is performed. For example, if only objects with photo attributes, screen processing is performed with a halftone dot pattern that emphasizes gradation, and if only objects with character attributes and / or graphics attributes, thinning and smoothing are performed for visibility. A screening process with a high multi-line number halftone dot pattern is performed.

  As described above, in the case of only a photograph attribute object, or only a character attribute and / or graphics attribute object, the data amount can be reduced by not generating the tag bit data, and the image development time and the image can be reduced. Processing time can be reduced.

  In order to describe the above-described embodiment of the present invention in more detail, an image processing apparatus and an image processing program according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram schematically illustrating the configuration of an image processing system according to the present embodiment. FIGS. 2 and 3 are block diagrams illustrating the configuration of an image processing apparatus. FIG. 4 is an image development unit and an image processing unit. It is a block diagram which shows the process of. FIG. 5 is a diagram illustrating an example of parameter information of image data, and FIGS. 6 to 17 are flowcharts illustrating processing of the image development unit and the image processing unit of the present embodiment.

  As illustrated in FIG. 1, the image processing system 10 according to the present exemplary embodiment includes a client 20 that transmits a print job in which data created by an application is converted into a page description language, and an image forming apparatus 40 that receives the print job acquired from the client 20. Processing apparatus (printer controller) 30 having a RIP function for converting image data to be usable in the printer, and an image forming apparatus (MFP: Multi Function Peripheral) such as a printer or a digital multi-function peripheral that performs printing based on the image data 40. The client 20 and the image processing apparatus 30 are connected via a communication network such as a LAN (Local Area Network) or a WAN (Wide Area Network), and the image processing apparatus 30 and the image forming apparatus 40 include a Video IF or the like. Connected with.

  The client 20 includes a CPU (Central Processing Unit), a ROM (Read Only Memory) and a RAM (Random Access Memory), an HDD (Hard Disk Drive), a NIC (Network Interface Card) for connecting to a communication network, A control unit including a communication I / F unit such as a modem, a display unit such as an LCD (Liquid Crystal Display), and an operation unit such as a keyboard and a mouse are provided. An OS (Operating System), a document application, a printer driver that generates a print job, and the like are read from the ROM or HDD into the RAM and executed on the CPU.

  The image processing apparatus 30 includes a control unit including a CPU, a memory such as a ROM and a RAM, an HDD, and a communication I / F unit. The control unit receives a print job from the client 20, performs image development processing by RIP to generate image data, performs image processing on the generated image data, and transmits the image data to the image forming apparatus 40.

  The image forming apparatus 40 includes a control unit including a CPU, a memory such as a ROM and a RAM, an HDD, a communication I / F unit, a display unit, an operation unit, and a printing unit. The upper printing unit performs printing based on the image data received from the image processing apparatus 30. For example, a photosensitive drum charged by a charging device is irradiated with light according to image data from an exposure device to form an electrostatic latent image, and charged with a developing device is developed and developed, and the toner image is developed. A process of transferring to a paper medium via a primary transfer roller and a secondary transfer belt and fixing with a fixing device is performed.

  In FIG. 1, the image processing apparatus 30 is an independent apparatus, but the image processing apparatus 30 may be included in the image forming apparatus 40 or the client 20.

  Next, a detailed configuration of the image processing apparatus 30 will be described. As shown in FIG. 2, the image processing device 30 (control unit) includes an input unit 31, a PDL storage unit 32, an image development unit 33, an image storage unit 34, an image processing unit 35, and the like.

  The input unit 31 is an interface such as a NIC for connecting to a communication network, or an interface for connecting to a USB (Universal Serial Bus), and is represented by PostScript or PCL (Printer Control Language) from the client 20 or an external storage device. Print job described in PDL. The print job may be described in a file format compatible with direct printing, for example, a format such as XPS (XML Paper Specification) or PDF (Portable Document Format).

  The PDL storage unit 32 is a memory, an HDD, or the like, and stores a PDL print job acquired by the input unit 31.

  The image development unit 33 is a RIP or the like, analyzes a PDL print job, performs drawing processing, generates image data for each page, and according to the object attribute type of each object included in the PDL data, It is determined whether to generate tag bit data, and tag bit data is generated according to the determination result. Specifically, it is determined whether or not to generate tag bit data according to whether or not the object types of a plurality of attributes that require different image processing are included, and the tag bit data is determined according to the determination result. Generate.

  The image storage unit 34 is a memory, an HDD, or the like, and stores the image data and tag bit data generated by the image development unit 33.

  The image processing unit 35 performs image processing based on tag bit data for each pixel for image data for which tag bit data has been generated, and image data for image data for which tag bit data has not been generated. Image processing is performed on each pixel of the image data according to the type of the object attribute designated as a whole, and image processed image data is output.

  In FIG. 2, the image processing device 30 performs image development processing and image processing. However, the image processing device 30 performs image development processing and the image forming device 40 performs image processing. Also good. In that case, as shown in FIG. 3, an image processing unit is provided on the image forming apparatus 40 side, and the image processing apparatus 30 transmits the image data and tag bit data generated by the image developing unit 33 to the image forming apparatus 40. Then, the image forming apparatus 40 performs image processing based on the image data and the tag bit data, and performs printing.

  In addition, each of the image development unit 33 and the image processing unit 35 may be partially or entirely configured as hardware, or configured as a program that causes the control unit to function as the image development unit 33 and the image processing unit 35. However, it may be configured to operate on the CPU. In addition, the format of data transfer between the image processing apparatus 30 and the image forming apparatus 40 is not particularly limited, and is based on a Video IF specification defined in advance between both apparatuses (for example, CMYK frame sequential format, compression format, etc.) If it is.

  Next, schematic operations of the image development unit 33 and the image processing unit 35 in the image processing apparatus 30 having the configuration shown in FIG. 2 will be described with reference to FIG.

  The image development unit 33 reads a PDL print job from the PDL storage unit 32, performs an analysis process, converts the command into intermediate data, and includes any object of character / graphics / photo depending on the type of the drawing command. And the determination result is written in the intermediate data.

  Then, based on the determination result written in the intermediate data, if the image data is composed of only the photograph attribute object or only the character or graphics attribute object, it is determined that the generation of the tag bit data is unnecessary. . If a photograph attribute object and a character or graphics attribute object are included, it is determined that it is necessary to generate tag bit data.

  After the above determination, the intermediate data is referred to, drawing processing is performed under conditions that match the characteristics of the output device such as resolution and print area, and image data and tag bit data (only when it is determined that generation is necessary) are generated.

  When the generation of the image data is completed, apart from the image data and the tag bit data (only when it is determined that the generation is necessary), as part of the parameter information such as the size of the image data, the presence / absence information of the tag bit data, the image data Is sent to the image processing unit 35. FIG. 5 shows an example of parameter information of image data, which describes a page number, image size, resolution, number of gradations, one line length, number of lines, presence / absence of tag bit data, object attribute type, and the like.

  Based on the presence / absence information of the tag bit data included in the parameter information of the image data, the image processing unit 35 refers to the tag bit data corresponding to each pixel of the image data when the tag bit data is present, and determines the type of the object attribute. The image processing according to is performed. On the other hand, when there is no tag bit data, image processing common to each pixel is performed on the entire image data based on the type information of the object attribute.

  Although this image processing differs depending on the characteristics of the object, basically, the processing is divided into gradation-priority photo attributes and visibility-priority character / graphics attributes.

  For example, if the object is only a photograph, the image data is subjected to a screening process using a preset gradation priority halftone dot pattern for photographs without performing processing such as thinning and smoothing on characters / graphics. Apply to the whole. If the object is only characters, graphics only, or characters and graphics, thinning and smoothing are performed, and screening is performed using a preset high-visibility multi-line dot pattern for characters / graphics. Apply processing.

  Next, detailed operations of the image development unit 33 and the image processing unit 35 will be described in detail with reference to FIGS. 6 is a flowchart showing a procedure of image development processing performed by the image development unit 33, FIG. 7 is a flowchart showing a procedure of PDL analysis processing during the image development processing, and FIG. 8 is a diagram during the image development processing. It is a flowchart figure which shows the procedure of a drawing process. FIG. 9 is a flowchart showing a procedure of image processing performed by the image processing unit 35.

  As shown in FIG. 6, the image development unit 33 performs PDL analysis processing (S100). Specifically, as shown in FIG. 7, the PDL is read from the PDL storage unit 32 (S101), the command is converted into an intermediate language, and written into the intermediate data (S102).

  Next, it is determined whether the command is an image drawing command for drawing an image object (S103). If the command is an image drawing command, a photo attribute flag is set (S104). If it is not an image drawing command, it is determined whether it is a graphics drawing command for drawing a graphics object (S105). If it is a graphics drawing command, a graphics attribute flag is set (S106). If it is neither an image drawing command nor a graphic drawing command, it is determined whether it is a font drawing command for drawing a text object (S107). If it is a font drawing command, a text attribute flag is set (S108).

  Thereafter, it is determined whether or not the processing for one page is completed (S109). If not completed, the process returns to S101 and the same processing is repeated. If completed, the attribute flag is written in the intermediate data (S110).

  Returning to FIG. 6, the image development unit 33 performs a drawing process (S120). Specifically, as shown in FIG. 8, the attribute flag of the intermediate data is read (S121), and it is determined whether only one of the attribute flags of characters, graphics, or photographs is set (S122). When only one of the attribute flags is set, image processing corresponding to the type of object attribute can be performed on the entire image data, so only the image data is generated and tag bit data is not generated. (S125).

  On the other hand, if a plurality of types of attribute flags are set, it is determined whether only character and graphics attribute flags are set (S123). When only the character and graphics attribute flags are set, the character attribute object and the graphics attribute object can perform the same image processing, so only the image data is generated and the tag bit data is generated. Not performed (S125).

  When a plurality of types of attribute flags are set (N in S122) and not only the character and graphics attribute flags (N in S123), that is, a photograph attribute object and a character attribute object and / or When objects with graphics attributes are mixed, the same image processing cannot be performed on these multiple types of objects, so both image data and tag bit data are generated as usual (S124).

  Thereafter, it is determined whether drawing for one page has been completed (S126). If it has not been completed, the process returns to S121 and the same processing is repeated. Information is notified to the image processing unit 35 (S127).

  Returning to FIG. 6 again, the image development unit 33 determines whether the processing for one job is completed (S130). If not completed, the processing returns to S100 and repeats the same processing. The process of the image development unit 33 is terminated.

  Next, as shown in FIG. 9, the image processing unit 35 determines whether there is tag bit data based on the presence / absence information of the tag bit data received from the image development unit 33 (S140). If there is, image processing is performed with reference to the tag bit data as usual (S150).

  On the other hand, if there is no tag bit data, based on the object attribute type information received from the image development unit 33, it is determined whether the object is a photograph attribute object (S160). In the case of a photo attribute object, image processing for the photo attribute is performed on the entire image data (S170). The image processing for the attribute is performed (S180). Thereafter, the image processed image data is output to the image forming apparatus 40 (S190), and the processing of the image processing unit 35 is terminated.

  The case where the detection of the object attribute and the determination of the presence / absence of the tag bit data is performed in units of pages has been described above. However, these processes can also be performed in units of bands obtained by further dividing jobs or pages.

  The operations of the image development unit 33 and the image processing unit 35 when executed in units of jobs are as shown in the flowcharts of FIGS. 10 to 13, and it is determined whether the processing for one job has been completed in S209 of the PDL analysis processing. In step S226 of the drawing process, it may be determined whether drawing for one job is completed.

  In addition, the operations of the image development unit 33 and the image processing unit 35 in the case of carrying out in units of bands are as shown in the flowcharts of FIGS. 14 to 17, and is the processing for one band completed in S309 of the PDL analysis processing? It is sufficient to determine whether drawing for one band has been completed in S326 of the drawing process.

  As described above, in this embodiment, at the time of image development processing, the object attribute included in the image data is determined, and it is determined whether or not the tag bit data is generated according to the type of the object attribute. Alternatively, in the case of an object having a character attribute and / or a graphics attribute, tag bit data is not generated, so that the data amount can be reduced, and the image development time and the image processing time can be reduced.

  In addition, this invention is not limited to description of the said Example, The structure and control can be changed suitably, unless it deviates from the meaning of this invention.

  For example, in the above embodiment, it is determined that tag bit data is not generated when a character attribute object and a graphics attribute object are mixed. However, when a plurality of types of objects are mixed, the tag bit is not generated. It is good also as a structure which produces | generates data.

  The present invention can be used for an image processing apparatus that generates tag bit data and an image processing program that operates on the image processing apparatus.

DESCRIPTION OF SYMBOLS 10 Image processing system 20 Client 30 Image processing apparatus 31 Input part 32 PDL storage part 33 Image expansion part 34 Image storage part 35 Image processing part 40 Image forming apparatus

Claims (16)

An input unit for inputting a print job including page description language data, a first storage unit for storing the print job input from the input unit, and reading and analyzing the print job from the first storage unit An image expansion unit that generates image data and generates tag bit data indicating an object attribute for each pixel of the image data; a second storage unit that stores the image data and the tag bit data; In an image processing apparatus having at least
The image development unit determines an object attribute of each object included in the page description language data at the time of analyzing the print job, and determines whether to generate the tag bit data according to the type of the object attribute. When the determination is made and it is determined not to generate the tag bit data, only the image data is generated. An image processing unit that reads the image data and the tag bit data from the second storage unit, performs predetermined image processing, and outputs the image data;
The image development unit notifies the image processing unit of the presence / absence information of the tag bit data and the type information of the object attribute;
The image processing unit refers to the presence / absence information of the tag bit data and the type information of the object attribute, and for the image data for which the tag bit data is generated, a tag bit corresponding to the pixel for each pixel Image processing based on the data is performed, and for image data for which the tag bit data is not generated, image processing corresponding to the type of the object attribute specified for the entire image data is performed on each pixel of the image data. The image processing apparatus according to claim 1.   The image development unit determines whether to generate the tag bit data according to whether the image data includes an object having a plurality of attributes that require different image processing. The image processing apparatus according to claim 1.   The image development unit determines that the tag bit data is not generated when the image data is composed of any one of a photo attribute, a character attribute, and a graphics attribute. The image processing apparatus according to claim 3.   4. The image according to claim 3, wherein the image development unit determines that the tag bit data is not generated when the image data includes an object having a character attribute and a graphics attribute. Processing equipment.   The image processing apparatus according to claim 1, wherein the image development unit determines whether to generate the tag bit data according to a type of an object attribute in units of pages.   The image processing apparatus according to claim 1, wherein the image development unit determines whether to generate the tag bit data according to a type of an object attribute for each band obtained by further dividing a page. .   The image processing apparatus according to claim 1, wherein the image development unit determines whether to generate the tag bit data according to a type of an object attribute for each job. An image processing program that operates on an apparatus that processes a print job including page description language data,
Said device,
Analyzing the print job, determining the object attribute of each object included in the image data obtained by developing the image of the print job, and according to the type of the object attribute, the image data and each pixel of the image data Generating tag bit data indicating an object attribute or generating only the image data and storing the generated data in a storage unit or transmitting the generated data to a printing device connected to the device. An image processing program characterized by the above. Said device further
For the image data from which data is read from the storage unit and the tag bit data is generated, image processing based on tag bit data corresponding to the pixel is performed for each pixel, and the tag bit data is not generated The image data is caused to function as an image processing unit that performs image processing on each pixel of the image data according to the type of object attribute specified for the entire image data. The image processing program described.   The image development unit determines whether to generate the tag bit data according to whether the image data includes an object having a plurality of attributes that require different image processing. The image processing program according to claim 9 or 10.   The image development unit determines that the tag bit data is not generated when the image data is composed of any one of a photo attribute, a character attribute, and a graphics attribute. The image processing program according to claim 11.   12. The image according to claim 11, wherein the image development unit determines that the tag bit data is not generated when the image data includes an object having a character attribute and a graphics attribute. Processing program.   The image processing program according to claim 9, wherein the image development unit determines whether to generate the tag bit data according to a type of an object attribute in units of pages.   The image processing program according to claim 9, wherein the image development unit determines whether to generate the tag bit data according to a type of an object attribute in units of bands obtained by further dividing a page. .   The image processing program according to claim 9, wherein the image development unit determines whether to generate the tag bit data according to a type of an object attribute for each job.

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