JP4793143B2 - Image forming apparatus, image forming method, and image forming program - Google Patents

Image forming apparatus, image forming method, and image forming program Download PDF

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JP4793143B2
JP4793143B2 JP2006190653A JP2006190653A JP4793143B2 JP 4793143 B2 JP4793143 B2 JP 4793143B2 JP 2006190653 A JP2006190653 A JP 2006190653A JP 2006190653 A JP2006190653 A JP 2006190653A JP 4793143 B2 JP4793143 B2 JP 4793143B2
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ink
reaction liquid
data
ink droplet
droplets
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JP2008018569A (en
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透 清水
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富士ゼロックス株式会社
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Description

  The present invention relates to an image forming apparatus, an image forming method, and an image forming program for forming an image by ejecting ink droplets and reaction droplets that react with the ink droplets.

  Currently, ink jet printers that include a recording head in which a plurality of nozzles that eject ink droplets are arranged and that record images by ejecting ink droplets from the nozzles are widely used.

  In recent years, in an ink jet printer, for the purpose of improving image density, bleeding of ink inside a sheet, and improvement of intercolor bleeding that occurs at a portion where different colors touch each other, A method is adopted in which a reaction liquid (a printability improving liquid for aggregating, thickening, or insolubilizing a colorant in ink and sometimes expressed as a processing liquid) is applied to paper.

  By the way, in the case of a printer using such processing liquid and ink droplets, the ink droplets applied to the paper become granular, which may be a major factor in image quality degradation.

Therefore, as a technique for avoiding the occurrence of such graininess, Patent Document 1 discloses a technique for applying a dilution liquid (treatment liquid) when the concentration of ink droplets is low.
Japanese Patent No. 3177113

  However, in the technique disclosed in Patent Document 1, even in the case of ink droplets aggregated by a diluent, granularity may be visible in the case of large ink droplets. Therefore, the technique disclosed in Patent Document 1 has a problem in that it is not always possible to suppress the occurrence of graininess due to ink droplets in image forming processing using ink droplets and processing liquid.

  In view of the above problems, the present invention provides an image forming apparatus, an image forming method, and an image forming program capable of suppressing the occurrence of graininess due to ink droplets in an image forming process using ink droplets and a reaction liquid. With the goal.

In order to achieve the above object, the invention according to claim 1 is a halftone image generating means for executing halftone processing on image data and generating halftone image data which is halftone processed image data. , based on the halftone image data, and the ink droplet ejection data generation means for generating an ink droplet ejection data indicating dots for ejecting ink droplets, based on the halftone image data, the ink droplet ejection data generating means has generated Among the dots ejecting the ink droplets indicated by the ink droplet ejection data , the reactive droplets are ejected to the dot formation positions excluding the specific dots that cause the granularity to occur due to the shape of the ink droplets attached to the recording medium. Reaction liquid discharge data generating means for generating reaction liquid discharge data on the ink, and the ink based on the ink droplet discharge data With ejects has an image forming means for forming an image by ejecting the reaction liquid droplets based on the reaction liquid ejection data, the said ink drops has multiple sizes, the specific dot The ink droplets corresponding to the specific dots are dots having a predetermined size and the gradation of the ink droplets belongs to a predetermined range .

According to the first aspect of the present invention, halftone processing is performed on the image data to generate halftone image data that is halftone processed image data, and ink droplets are generated based on the halftone image data. Ink droplet ejection data indicating dots to be ejected is generated, and based on the halftone image data, among the dots ejecting ink droplets indicated by the ink droplet ejection data generated by the ink droplet ejection data generation unit , a recording medium is used. Reaction liquid ejection data is generated so that reaction droplets are ejected to dot formation positions excluding specific dots that cause the shape of the adhered ink droplets to generate a graininess, and the ink is generated based on the ink droplet ejection data. In addition to ejecting droplets, the reaction droplets are ejected based on the reaction fluid ejection data to form an image. That reaction droplets to aggregate ink droplets in the causative form of a particular dot position is not discharged, the results which can bleed ink droplets, it is possible to suppress the generation of graininess due to ink droplets.

  Note that the graininess indicates that the graininess appears and stands out, in other words, the graininess and granularity are high. This graininess is generated when the density and size of ink droplets (including the case where dots appear to be two or three adjacent) are different from those of surrounding dots.

On the other hand, in order to achieve the above object, the invention of claim 2 performs a halftone process on image data to generate halftone image data which is halftone processed image data. If, based on the halftone image data, and the ink droplet ejection data generation step of generating an ink droplet ejection data indicating dots for ejecting ink droplets, based on the halftone image data, generated by the ink droplet ejection data generating step Out of the dots ejecting the ink droplets indicated by the ink droplet ejection data , the reactive droplets are ejected to the dot formation positions excluding the specific dots that cause the granularity of the shape of the ink droplets attached to the recording medium. The reaction liquid discharge data generation stage for generating the reaction liquid discharge data as described above, and the ink droplet discharge data based on the ink drop discharge data. While ejecting click droplets have an image forming step of forming an image by ejecting the reaction liquid droplets based on the reaction liquid ejection data, the said ink drops has multiple sizes, the specific A dot is a dot in which the ink droplet corresponding to the specific dot has a predetermined size and the gradation of the ink droplet belongs to a predetermined range .

Here, the invention according to claim 2 operates in the same manner as the invention according to claim 1, so that the same effect as the effect of the invention according to claim 1 can be obtained.

On the other hand, in order to achieve the above object, the image forming program according to claim 3 executes halftone processing on the image data to generate halftone image data which is halftone processed image data. a generation step, based on said halftone image data, and the ink droplet ejection data generating step of generating an ink droplet ejection data indicating dots for ejecting ink droplets, based on the halftone image data, the ink droplet ejection data generating step Of the ink droplets indicated by the ink droplet discharge data generated in step 1, the reactive liquid droplets are formed at the dot formation positions excluding the specific dots that cause the granularity of the shape of the ink droplets attached to the recording medium. A reaction liquid discharge data generating step for generating reaction liquid discharge data so as to discharge While ejecting the ink droplets on the basis of the droplet ejection data, and an image forming step of forming an image by ejecting the reaction liquid droplets based on the reaction liquid ejection data, cause the computer to execute, the ink droplets There are a plurality of sizes, and the specific dot is a dot in which the ink droplet corresponding to the specific dot has a predetermined size and the gradation of the ink droplet belongs to a predetermined range .

In the third aspect of the present invention, the computer can be operated in the same manner as in the first aspect of the invention, so that the same effect as that of the first aspect of the invention can be obtained.

  According to the present invention, it is possible to provide an image forming apparatus, an image forming method, and an image forming program capable of suppressing the occurrence of graininess due to ink droplets in an image forming process using ink droplets and a reaction liquid. An effect is obtained.

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

  As shown in FIG. 1, an inkjet recording apparatus 10 as an image forming apparatus according to the present embodiment includes a reaction liquid head 12 </ b> L that discharges a reaction liquid from the upstream side in the conveyance direction of the paper P, and K (black ), C (cyan), M (magenta), and Y (yellow), the recording heads 12K, 12C, 12M, and 12Y are arranged. The ink jet recording apparatus 10 includes ink tanks 14Y, 14M, 14C, and 14K that store ink to be supplied to the recording heads 12K to 12Y, and a reaction liquid tank 14L that stores reaction liquid to be supplied to the reaction liquid head 12L. Yes.

  As the ink stored in each of the ink tanks 14K to 14Y, various known inks such as water-based ink, oil-based ink, and solvent-based ink can be used.

  Further, the reaction liquid stored in the reaction liquid tank 14L is a reaction liquid that reacts with the ink, and the color material in the ink is aggregated, thickened, or insolubilized to improve the image density, and the ink inside the paper. Improves blurring and intercolor bleeding that occurs in areas where different colors touch each other. By applying the ink droplets and the reaction liquid so that the reaction liquid and each color ink overlap, the image quality can be improved. Examples of reaction liquids include, but are not limited to, organic acid type reaction liquids, polyvalent metal type reaction liquids, mixed types of organic acids and polyvalent metals, and mixed types of organic acids and organic amines. Instead, it may be anything that reacts with ink to improve image density or reduce dot bleeding.

  In the following description, since the recording heads 12K to 12Y and the reaction liquid head 12L have the same structure, the suffix at the end of the reference numerals will be omitted and referred to as the head 12 when they are not particularly distinguished.

  In addition, the inkjet recording apparatus 10 includes a paper feed tray 16 that stores paper P as a recording medium, an endless belt-like transport body 24 that is disposed opposite to the head 12 and transports the paper P, and a printed paper. A paper discharge tray 18 is provided.

  Further, the inkjet recording apparatus 10 includes a first conveyance path constituted by a path 20A from the paper feed tray 16 to the conveyance body 24 and a path 20B from the conveyance body 24 to the paper discharge tray 18, and the first conveyance path. A plurality of transport rollers are provided so that a second transport path 22 extending from the path 20B to the transport body 24 in the opposite direction is formed.

  In the first conveyance path 20A, the paper P is conveyed from the paper feed tray 16 to the conveyance body 24 by a plurality of conveyance rollers one by one, and in the path 20B, the discharge tray 18 is conveyed by a plurality of conveyance rollers. To reach. In the present embodiment, the second transport path 22 is provided to enable double-sided printing by inverting the paper.

  Further, the transport body 24 includes a belt wound around two rolls. As a method of holding the paper P by the transport body 24, a power feeding suction force can be used. That is, the sheet is pressed against the belt by the charging roll, and the sheet P is charged to generate an adsorption force.

  The head 12 has a plurality of droplet ejectors ejecting ink droplets or reaction droplets in a direction perpendicular to the sheet transport direction (referred to as a main scanning direction) on a head bar having a length corresponding to the width of the sheet P. The recording area is configured to have a recording area corresponding to the maximum width of the paper P. The ink jet recording apparatus 10 can discharge droplets over the entire width of the paper P by performing recording while transporting only the paper P while the head 12 is fixed without performing main scanning.

  As shown in FIG. 2, the droplet ejector 50 includes a droplet pressure chamber 50B communicating with a nozzle 50A for ejecting ink droplets or a reaction liquid, and a piezoelectric element 50C provided in contact with the droplet pressure chamber 50B. It is comprised including. As is well known, the piezoelectric element 50C has a property that its shape changes when a voltage is applied. By using this shape change, pressure is applied to the droplet pressure chamber 50B, and an ink droplet or an ink droplet is generated from the nozzle 50A. The reaction liquid is discharged and dots are recorded on the paper P.

  Specifically, as shown in FIG. 2A and FIG. 2C, by controlling the driving waveform applied to the piezoelectric element 50C, for example, a large ink droplet (FIG. 2B) from the nozzle 50A. Reference) and small ink droplets (see FIG. 2D) can be ejected. When ink droplets or reaction liquid are not ejected from the nozzle 50A (no droplets), a waveform voltage that does not form dots is applied.

  FIG. 3 is a block diagram showing the configuration of the control system of the inkjet recording apparatus 10 according to the present embodiment. As shown in FIG. 3, the inkjet recording apparatus 10 includes a resolution conversion unit 30 that converts image data into image data having a resolution that can be output by the inkjet recording apparatus 10 when image data is input from the outside. Yes.

  The color conversion unit 32 performs color conversion processing and density conversion processing on the image data processed by the resolution conversion unit 30 according to the characteristics of the paper P and ink. The processing by the color conversion unit 32 is normally performed according to a color (density) conversion table. The color (density) conversion table is separately created and stored so that the color (density) characteristics expressed by the image data match the color (density) characteristics expressed by the inkjet recording apparatus 10.

  The quantization unit 34 performs halftone processing on the image data processed by the color conversion unit 32. Here, since 256-gradation image data is input, the quantization unit 34 can control the 256-gradation image data by a recording head driving unit 38 described later (that is, recording by the inkjet recording apparatus 10). Convert to image data with the number of tones possible. For example, if the inkjet recording apparatus 10 can record two gradations of “no drops / drops”, binary halftone processing is performed, and “no drops / small drops / medium drops / large drops” 4 If gradation recording is possible, four-value halftone processing is performed. Halftone processing is performed by known error diffusion processing or dither processing. In this embodiment, the case of recording with two gradations will be described as an example.

  The ink ejection data generation unit 36 generates ink droplet ejection data (ink ejection data) based on the image data processed by the quantization unit 34. Specifically, the ink ejection data generation unit 36 converts the data structure into a data structure that can be recorded by the recording head driving unit 38, rearranges the data in the recording order (transfer order), generates this as ink ejection data, and drives the recording head. To the unit 38. At this time, ink discharge data is generated in consideration of the discharge timing and the data arrangement mapped to the arrangement of the recording heads 12K to 12Y and the nozzle 50A. Various control signals are applied and inserted as necessary.

  The recording head driving unit 38 outputs ink from the nozzle 50A of the droplet ejector 50 by outputting a driving signal having a predetermined driving waveform to the piezoelectric element 50C of each droplet ejector 50 of the recording heads 12K to 12Y according to the ink ejection data. Let the drops be ejected.

  In addition, the ink jet recording apparatus 10 includes a reaction liquid discharge data generation unit 44.

  The reaction liquid discharge data generation unit 44 generates reaction liquid discharge data for discharging the reaction liquid based on the image data that has been halftone processed by the quantization unit 34. Similar to the ink discharge data generation unit 36, the reaction liquid discharge data generation unit 44 rearranges the generated reaction liquid discharge data in the recording order (transfer order) and outputs it to the reaction liquid head drive unit 46. Various control signals are applied and inserted as necessary.

  The reaction liquid head drive unit 46 outputs a drive signal having a predetermined drive waveform from the nozzle 50A of the droplet ejector 50 by outputting a drive signal having a predetermined drive waveform to the piezoelectric element 50C of each droplet ejector 50 of the reaction liquid head 12L according to the reaction liquid discharge data. The reaction solution is discharged.

  The resolution conversion unit 30, the color conversion unit 32, the quantization unit 34, the ink discharge data generation unit 36, the recording head drive unit 38, the reaction liquid discharge data generation unit 44, and the reaction liquid head drive unit 46 control these. A control unit 40 is connected.

  The control unit 40 includes a CPU, a RAM, a ROM, and the like. The recording head driving unit 38 is generated by the ink ejection data generation unit 36 while controlling the conveyance system 42 and conveying the sheet by the conveyance body 24. The droplet ejector 50 of the recording heads 12K to 12Y is driven based on the ink ejection data to eject ink droplets, and the reaction liquid ejection data generated by the reaction liquid ejection data generating unit 44 by the reaction liquid head driving unit 46. Based on the above, the droplet ejector 50 of the reaction liquid head 12L is driven to discharge the reaction droplets, thereby forming an image.

  Next, a flow of processing for generating ink discharge data and reaction liquid discharge data in the inkjet recording apparatus 10 will be described. Here, a case where printing is performed with any one of CMYK will be described as an example.

  First, image data input from an external computer or the like is subjected to resolution conversion by a resolution conversion unit 30 and color conversion / density conversion by a color conversion unit 32. The image data processed by the color conversion unit 32 is halftone processed by the quantization unit 34. In the present embodiment, image data of 256 gradations is converted into image data of two gradation recording level values of “no drops (0) / with drops (255)”. The halftone processed image data (hereinafter referred to as quantized data) is converted into ink discharge data by the ink discharge data generation unit 36. Specifically, first, the quantized data is converted into a data structure that can be recorded by the recording head driving unit 38 (for example, no drop (0) / with drop (1)). Thereafter, the ink ejection data is generated by rearranging the data in the recording order (transfer order) while considering the arrangement of the nozzles 50A.

  The recording head drive unit 38 applies a drive waveform voltage corresponding to the ink discharge data generated by the ink discharge data generation unit 36 to the piezoelectric element 50 </ b> C of each droplet ejector 50. Thereby, ink droplets corresponding to the ink ejection data are ejected.

  Hereinafter, the process of the reaction liquid discharge data generation unit 44 will be described using a flowchart. First, a process for generating reaction liquid discharge data based on halftone image data will be described. In the following description, there are four types of ink droplet sizes: large, medium, small, and no droplets. Ink droplets other than droplets are expressed as large droplets, medium droplets, and small droplets in order of droplet size. .

  In step 101, the reaction liquid discharge data generation unit 44 acquires the halftone image data generated by the quantization unit 34. Next, in step 102, the reaction liquid discharge data generation unit 44 performs a reaction liquid discharge data generation process. After the processing described with reference to FIG. 4, an image forming process is performed in which ink droplets are ejected based on the ink droplet ejection data, and reaction droplets are ejected based on the reaction liquid ejection data to form an image.

  The reaction liquid discharge data generation process will be described with reference to the flowchart of FIG. First, in step 201, the reaction liquid discharge data generation unit 44 initializes the counter k with zero. The counter k is a counter for counting the number of dots. In this flowchart, the number of all dots is M.

  Next, the reaction liquid discharge data generation unit 44 determines whether or not there is a drop in step 202. “No droplet” indicates that no ink droplet is ejected. If no ink droplet is ejected, the process proceeds to step 211. If the reaction liquid ejection data generation unit 44 makes a negative determination in step 202, in step 203, the reaction liquid ejection data generation unit 44 acquires the density of the ink droplet corresponding to the kth dot from the image data.

  In step 204, the reaction liquid ejection data generation unit 44 determines whether or not the density of the ink droplet is lower than a predetermined density X. The density X is a value determined by the physical properties of the ink, the physical properties of the reaction liquid, the characteristics of the paper, and the like.

  If the reaction liquid discharge data generation unit 44 makes an affirmative determination in step 204, the reaction liquid discharge data generation unit 44 sets the kth dot as a specific dot in step 208 and corresponds to the reaction liquid discharge dot corresponding to that dot. After the reaction liquid discharge data is set to OFF indicating that no reaction liquid is discharged, the process proceeds to step 211. On the other hand, if the reaction liquid ejection data generation unit 44 makes a negative determination in step 204, the size of the ink droplet is acquired from the image data in the next step 205.

  Next, in step 206, the reaction liquid ejection data generation unit 44 determines whether the size of the ink droplet is the smallest of the three sizes except for no droplet, and if an affirmative determination is made. On the other hand, if the determination is negative in step 208, the kth dot is not a specific dot in step 207, so the reaction liquid discharge data corresponding to the reaction liquid discharge dot corresponding to that dot is added to the reaction liquid discharge data. Is set to ON indicating that the liquid is discharged.

  Next, in step 209, the reaction liquid discharge data generation unit 44 determines whether the acquired halftone image data is mixed halftone image data of three or more droplets. The mixed halftone of three or more droplets will be described later.

  If the reaction liquid discharge data generation unit 44 makes an affirmative determination in step 209, the reaction liquid discharge data generation unit 44 performs a process for mixed halftones of three or more drops described later in step 210. On the other hand, if the reaction liquid discharge data generation unit 44 makes a negative determination in step 209, the reaction liquid discharge data generation unit 44 increments the counter k by 1 in step 211, and the counter k is smaller than M in step 212. Judge whether or not. When the counter k is smaller than M, the reaction liquid ejection data for all the dots has not been generated, so the process of step 202 is performed again. On the contrary, when the counter k is equal to or greater than M, the reaction liquid discharge data generation unit 44 has generated the reaction liquid discharge data for all the dots, and thus ends the process.

  Next, banding will be described with reference to FIG. FIG. 6A shows an image 70A in which banding has occurred, and dot information 72A indicating the dot formation position and ink droplet size at that time. FIG. 6B shows an image 70B in which ink droplets are granular, and dot information 72B indicating the dot formation position and the size of the ink droplets at that time. The dot information 72A and 72B have the same macroscopic density and the same amount of dot landing deviation, but the dot information 72B has less noticeable stripes (banding) than the dot information 72A.

  The diagram shown in FIG. 6B is obtained by adjusting the ink droplet size as a banding countermeasure that is a countermeasure for preventing banding. Here, the dot information 72A in FIG. 6A shows two types of ink droplet sizes (including no droplets), but the dot information 72B in FIG. 6B has four types (droplets). Ink droplet sizes (including none) are shown. However, as shown in the image 70B, although the banding can be avoided, the graininess is visually recognized.

  Adjustment of the ink droplet size when preventing the banding described above will be described with reference to FIGS. FIG. 7 is a graph showing the correspondence relationship between the gradation of ink droplets and the appearance rate of large, medium, and small dots when banding countermeasures are not taken. The horizontal axis represents the gradation from 0 to 255, and the vertical axis represents the dot. Appearance rates are shown from 0% to 100%. Also, the one-dot broken line indicates no droplet, the solid line indicates a small droplet, the broken line indicates a medium droplet, and the two-dot broken line indicates a large droplet.

  On the other hand, FIG. 8 is a graph showing the correspondence between the gradation when banding is taken and the appearance ratio of large, medium, and small dots, and the horizontal axis indicates the gradation from 0 to 255 as in FIG. The dot appearance rate is shown from 0% to 100%. Also, the one-dot broken line indicates no droplet, the solid line indicates a small droplet, the broken line indicates a medium droplet, and the two-dot broken line indicates a large droplet.

  Comparing FIG. 7 and FIG. 8, as shown in FIG. 8, in the range A from the gradation 45 to the gradation 80, the middle droplet that did not appear in FIG. In the range B of the key 165, large droplets that did not appear in FIG. 7 appear (discharge). Therefore, when banding measures are taken, three types of large, medium and small ink droplets may be mixed (see dot information 72B in FIG. 6).

  As shown in FIG. 7 above, a normal halftone in which more than two types of dots do not appear in a certain density region, a halftone in which three or more types of droplets are mixed as shown in FIG. It is called mixed halftone with 3 or more drops. The reason for using the mixed halftone of 3 or more droplets is to make the banding less noticeable.

  The specific dot is not limited to the mixed halftone of three or more drops, but is a dot of a drop that does not appear in a halftone in which more than two kinds of dots do not appear as shown in FIG. 7 (for example, noise is added to the threshold value). Large droplets that occur exceptionally).

  By mixing the ink droplet sizes in this way, an image avoiding banding as shown in the image 70B (see FIG. 6) can be obtained. However, as described above, graininess occurs in this case. The occurrence of this graininess is caused by the fact that the medium droplets in the above range A are conspicuous among the small droplets. Similarly, the large droplets in the range B are prominent in the small droplets or medium droplets, which causes the graininess.

  Therefore, in the range A, by not applying a reaction liquid that agglomerates the medium droplets, the ink droplets from the medium droplets are blotted so that the graininess is not noticeable. Similarly, in the range B, by not applying a reaction liquid for aggregating large droplets, ink droplets due to large droplets are blotted so that graininess is not noticeable.

  As described above, if the ink droplets ejected onto the dots are ink droplets of a predetermined size and the dots belonging to a predetermined range of the ink droplets are specified dots, banding countermeasures are taken. In this case, since medium drops or large drops in the ranges A and B can be blotted, the occurrence of graininess can be suppressed.

  This process will be described with reference to the flowchart of FIG. 9 (process for mixed halftones of three or more drops). In step 301, the reaction liquid ejection data generation unit 44 determines whether the ink droplet ejected at the dot position is a medium droplet and the gradation belongs to the range A. If the reaction liquid discharge data generation unit 44 makes an affirmative determination in step 301, in step 303, the reaction liquid discharge data generation unit 44 sets the dot as a specific dot and corresponds to the reaction liquid discharge tod corresponding to the dot. Set the reaction liquid discharge data to OFF.

  On the other hand, if the reaction liquid ejection data generation unit 44 makes a negative determination in step 301, the reaction liquid ejection data generation unit 44 determines in step 302 that the ink droplet ejected at the dot position is a large droplet and the gradation range B. If the determination is negative, the process proceeds to step 303. If the determination is negative, the process ends.

  By doing so, it is possible to suppress the occurrence of graininess even when banding is taken.

  As described above in detail, in the present embodiment, halftone image generation means (quantization) that performs halftone processing on image data and generates halftone image data that is halftone processed image data. Section 34), ink droplet ejection data generation means (ink ejection data generation section 36) for generating ink droplet ejection data indicating dots for ejecting ink droplets based on the halftone image data, and the halftone image data Based on this, the reaction liquid is discharged so that the reaction liquid droplets are discharged to the dot formation position excluding the specific dots in which the shape of the ink droplets attached to the recording medium is granular among the dots discharging the ink droplets indicated by the halftone image data. Reaction liquid discharge data generation means (reaction liquid discharge data generation unit 44) for generating discharge data, and the ink droplet discharge data And an image forming unit (recording head driving unit 38, reaction liquid head driving unit 46) that discharges the ink droplets and forms an image by discharging the reaction liquid droplets based on the reaction liquid discharge data. Therefore, the reaction droplets that aggregate the ink droplets are not ejected at the formation positions of the specific dots that are granular, and the ink droplets can be blotted. As a result, the occurrence of graininess due to the ink droplets can be suppressed.

  In the present embodiment, the specific dot is a dot in which the density of the ink droplet corresponding to the specific dot is lower than a predetermined density (Y in step 204 in FIG. 5). The specific dot can be a dot whose density is lower than the density causing the ink droplet density to generate a predetermined granularity.

  In this embodiment, the ink droplet has a plurality of sizes, and the specific dot is a dot from which the smallest ink droplet is ejected among the plurality of sizes (see FIG. 5). In step 206 Y), the specific dot can be a dot from which the ink droplet of the smallest size causing the graininess is ejected.

  Further, in the present embodiment, the ink droplet has a plurality of sizes, and the specific dot has a predetermined size for the ink droplet corresponding to the specific dot, and the gradation of the ink droplet is in advance. Since the dots belong to a predetermined range (Y in steps 301 and 302 in FIG. 9), for example, a dot from which an ink droplet that tends to be grainy due to the size of the surrounding ink droplet is different is set as the specific dot. Can do.

  In the present embodiment, the specific dot can be determined depending on the type of the recording medium. This is because, depending on the type of recording medium, the density at which graininess occurs and the size of the ink droplet are different. For example, the value of X in step 204 in FIG. The specific dot may be determined according to the type of the recording medium by replacing the determination of “whether it is a droplet” with, for example, the determination of “medium droplet”.

  In the present embodiment, halftone processing is performed on the image data to generate halftone image data that is halftone processed image data (halftone processing by the quantization unit 34). ), Ink droplet ejection data generation stage (ink ejection data generation processing by the ink ejection data generation unit 36) for generating ink droplet ejection data indicating dots for ejecting ink droplets based on the halftone image data, and the half Based on the tone image data, among the dots ejecting the ink droplets indicated by the halftone image data, the reactive droplets are ejected to dot formation positions excluding the specific dots where the shape of the ink droplets attached to the recording medium is granular. Reaction liquid discharge data generation stage for generating reaction liquid discharge data Reaction liquid ejection data generation process) and an image forming stage for ejecting the ink droplets based on the ink droplet ejection data and ejecting the reaction liquid droplets based on the reaction liquid ejection data to form an image ( Ink droplet ejection processing by the recording head driving unit 38 and reaction liquid ejection processing by the reaction liquid head driving unit 46), the reaction liquid droplets that cause the ink droplets to aggregate are ejected to the granular specific dot formation positions. As a result, the ink droplets can be blotted, and as a result, the occurrence of graininess due to the ink droplets can be suppressed.

  Further, in the present embodiment, a halftone image generation step (halftone processing by the quantizing unit 34) that generates halftone image data that is halftone processed image data by executing halftone processing on the image data. ), An ink droplet discharge data generation step (ink discharge data generation process by the ink discharge data generation unit 36) for generating ink droplet discharge data indicating dots for discharging ink droplets based on the halftone image data, and the half Based on the tone image data, among the dots ejecting the ink droplets indicated by the halftone image data, the reactive droplets are ejected to dot formation positions excluding the specific dots where the shape of the ink droplets attached to the recording medium is granular. Reaction liquid discharge data generation step for generating reaction liquid discharge data A reaction liquid ejection data generation process by the generation unit 44, and an image for ejecting the ink droplets based on the ink droplet ejection data and ejecting the reaction liquid droplets based on the reaction liquid ejection data to form an image. Forming step (ink droplet discharging process by the recording head driving unit 38 and reaction liquid discharging process by the reaction liquid head driving unit 46). Is not ejected and the ink droplets can be blotted, so that the occurrence of graininess due to the ink droplets can be suppressed. The image forming program is recorded on a recording medium such as a ROM included in the control unit 40. In addition, the order of processing in the flowchart described in the present embodiment is not limited to the order in the above-described flowchart, and may be an order within a range that does not depart from the spirit of the processing.

1 is a schematic configuration diagram of an ink jet recording apparatus according to an embodiment of the present invention. It is a figure which illustrates typically the structure of a droplet ejector, the drive waveform of the voltage applied to the piezoelectric element of a droplet ejector, and the size of the dot discharged corresponding to this drive waveform. 2 is a block diagram illustrating a configuration of a control system of the ink jet recording apparatus. FIG. It is a flowchart which shows the process of a reaction liquid discharge data generation part. It is a flowchart which shows a reaction liquid discharge data generation process. It is a figure which shows generation | occurrence | production of banding and generation | occurrence | production of a granularity. It is a graph which shows the correspondence of the gradation when banding measures are not taken, and the dot appearance rate of large, medium and small. It is a graph which shows the correspondence of the gradation at the time of taking a banding countermeasure, and the large and small dot appearance rate. It is a flowchart which shows the process for banding in the case of taking a banding countermeasure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inkjet recording device 12L Reaction liquid head 12C, 12M, 12Y, 12K Recording head 14Y, 14M, 14C, 14K Ink tank 14L Reaction liquid tank 30 Resolution conversion part 32 Color conversion part 34 Quantization part 36 Ink discharge data generation part 38 Recording Head drive unit 40 Control unit 44 Reaction liquid discharge data generation unit 46 Reaction liquid head drive unit 50 Droplet ejector 50A Nozzle 50B Droplet pressure chamber 50C Piezoelectric element

Claims (3)

  1. Halftone image generating means for executing halftone processing on image data and generating halftone image data that is halftone processed image data;
    Ink droplet ejection data generating means for generating ink droplet ejection data indicating dots for ejecting ink droplets based on the halftone image data;
    Of the dots ejecting the ink droplets indicated by the ink droplet ejection data generated by the ink droplet ejection data generation unit based on the halftone image data, the shape of the ink droplets attached to the recording medium generates a granular feeling. Reaction liquid discharge data generating means for generating reaction liquid discharge data so as to discharge reaction liquid droplets to the dot formation position excluding the specific dot that causes
    An image forming unit that discharges the ink droplet based on the ink droplet discharge data and discharges the reaction droplet based on the reaction liquid discharge data to form an image;
    I have a,
    The ink droplet has a plurality of sizes,
    The specific dot is an image forming apparatus in which the ink droplet corresponding to the specific dot is a dot having a predetermined size and a gradation of the ink droplet belongs to a predetermined range .
  2. A halftone image generation stage that performs halftone processing on image data and generates halftone image data that is halftone processed image data;
    Based on the halftone image data, an ink droplet ejection data generation step for generating ink droplet ejection data indicating dots for ejecting ink droplets;
    Based on the halftone image data, among the dots ejecting the ink droplets indicated by the ink droplet ejection data generated in the ink droplet ejection data generation stage, the shape of the ink droplets attached to the recording medium generates a granular feeling A reaction liquid discharge data generation stage for generating reaction liquid discharge data so as to discharge reaction liquid droplets to the dot formation position excluding the specific dot that causes the
    An image forming step of discharging the ink droplets based on the ink droplet discharge data and discharging the reaction droplets based on the reaction liquid discharge data to form an image;
    I have a,
    The ink droplet has a plurality of sizes,
    The image forming method , wherein the specific dot is a dot in which the ink droplet corresponding to the specific dot has a predetermined size and the gradation of the ink droplet belongs to a predetermined range .
  3. A halftone image generation step of performing halftone processing on the image data to generate halftone image data which is halftone processed image data;
    An ink droplet ejection data generation step for generating ink droplet ejection data indicating dots for ejecting ink droplets based on the halftone image data;
    Based on the halftone image data, among the dots ejecting the ink droplets indicated by the ink droplet ejection data generated in the ink droplet ejection data generation step, the shape of the ink droplets attached to the recording medium generates a granular feeling A reaction liquid discharge data generation step for generating reaction liquid discharge data so as to discharge a reaction liquid droplet to a dot formation position excluding a specific dot that causes the
    An image forming step of ejecting the ink droplets based on the ink droplet ejection data and ejecting the reaction droplets based on the reaction liquid ejection data to form an image;
    To the computer ,
    The ink droplet has a plurality of sizes,
    The specific dot is an image forming program in which the ink droplet corresponding to the specific dot is a dot having a predetermined size and the gradation of the ink droplet belongs to a predetermined range .
JP2006190653A 2006-07-11 2006-07-11 Image forming apparatus, image forming method, and image forming program Active JP4793143B2 (en)

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JP4605261B2 (en) 2008-06-23 2011-01-05 ソニー株式会社 Display device, display device driving method, and electronic apparatus
EP2500173B1 (en) 2011-03-15 2015-07-08 Brother Kogyo Kabushiki Kaisha Liquid ejection apparatus
JP5516464B2 (en) * 2011-03-15 2014-06-11 ブラザー工業株式会社 Liquid ejection device

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JPH0852867A (en) * 1994-08-10 1996-02-27 Canon Inc Ink jet recorder
JP5164303B2 (en) * 2000-07-17 2013-03-21 キヤノン株式会社 Recording device, image processing device, data generation method, computer program, and recording system
JP3472250B2 (en) * 2000-09-01 2003-12-02 キヤノン株式会社 Inkjet printing method and apparatus
JP4458776B2 (en) * 2002-07-03 2010-04-28 キヤノン株式会社 Inkjet recording apparatus, image processing method, and control program
JP4420461B2 (en) * 2004-06-28 2010-02-24 キヤノン株式会社 Recording method, ink cartridge, and image forming method
JP4617772B2 (en) * 2004-08-20 2011-01-26 富士ゼロックス株式会社 Image processing apparatus, image processing method, image processing program, and image recording apparatus
JP4375167B2 (en) * 2004-08-27 2009-12-02 コニカミノルタホールディングス株式会社 Image forming apparatus, image forming method, and image forming program
JP4665470B2 (en) * 2004-09-21 2011-04-06 富士ゼロックス株式会社 Image processing apparatus, image processing method, image processing program, and image recording apparatus
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