JP2008197555A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance stability of color density important for a user. <P>SOLUTION: By setting the density of density control patches of respective colors Y, M, C and K by a user, the image forming apparatus 100 forms the patch images of the respective colors Y, M, C and K on an intermediate transfer belt 406 while aiming at the set density. The image forming apparatus 100 reads the patch images by a density sensor 414, compares the density of the read image with the density set by the user, and corrects exposure potential when a photoreceptor is exposed based on a result of the comparison, and then forms a latent image on the photoreceptor by the corrected exposure potential or the like. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image forming apparatus.

When image formation is performed with an electrophotographic image forming apparatus that forms a color image, the color density to be reproduced is stable and there is no change in color density as long as the image has the same color. Is required. However, in an electrophotographic image forming apparatus, the stability of density fluctuates due to a change in the environment in which the apparatus is placed or deterioration with time of the photoconductor / developer, so that no adjustment is made in the image forming apparatus. In this case, even if an image of the same color is formed, the color density of the image formed at a certain time and the color density of the image formed at another time may be different.
Therefore, in an electrophotographic image forming apparatus, an image is formed according to a stored patch image (patch image), the formed patch image is read, and the density of the read patch image is stored. A technique has been devised that stabilizes the density of the output image by controlling the exposure potential so as to correct the difference from the density of the patch image (see, for example, Patent Document 1). If this technology is used, when it is desired to stabilize the density of each color of yellow (Y), magenta (M), cyan (C), and black (K), it is based on a patch image having a predetermined density of each color stored in advance. Forming a patch image, reading the patch image, and controlling the exposure potential so as to correct the difference between the density of the read patch image of each color and the density of each stored color image. Concentration fluctuation can be suppressed.

JP-A-5-303254

  By the way, among the images that the user intends to form, there are colors that are particularly emphasized by the user with respect to color reproducibility, such as the color of a corporate mark or the color of a logo if the image is a corporate document. However, the density of each of the colors Y, M, C, and K for the color that is important to the user is often different from the density of the patch image described above, and in the image forming apparatus, the density of the patch image set by the manufacturer is used as a reference. Although the control is performed so that the color density is stable, the density control is not performed with emphasis on the density that is important to the user. In order to perform control so that the density of the color emphasized by the user is stabilized, for example, a patch image having a large number of densities is stored, the user selects the patch image of the density emphasized by the user, and the selected patch is selected. It is also conceivable to perform density control using an image. However, since the color emphasized by the user is different for each user, when a patch image corresponding to the density emphasized by the user is prepared at the time of shipment of the image forming apparatus, an enormous number of patch images are prepared. . When the number of patch images becomes enormous, it is inconvenient because a complicated procedure is required for the user to select a patch image corresponding to a desired color.

  The present invention has been made under the background described above, and an object of the present invention is to make it possible to increase the stability of color density important for the user.

  In order to solve the above-described problem, the present invention receives an instruction to change the set density of at least one color density control patch image from the outside, and controls density of a color instructed to change density by the received change instruction. Density setting means for setting the density of a patch image in accordance with the change instruction; and means for forming a toner image of an image represented by the supplied image information, wherein density control information in which the density of the toner image to be formed is determined An image of an evaluation image having a predetermined area for each color for which the density is set by the density setting means, and the density of the color in the area is the density set by the density setting means Image information supply means for supplying information to the toner image forming means, measuring means for measuring the density of the toner image of the evaluation image formed by the toner image forming means for each region, and the measurement Provides a density of a color of said measured regions by means, an image forming apparatus and a correcting means for correcting the density control information in accordance with the density difference between the density of the color set by the concentration setting means.

In another aspect of the present invention, an image reading unit that reads an image formed on a recording material, and an image read by the image reading unit is decomposed into a plurality of predetermined color images. Density analysis means for analyzing density, and the density setting means may set the density of each of the predetermined plurality of colors to the density analyzed by the density analysis means.
In another aspect of the present invention, an image forming unit that forms a toner image formed by the toner image forming unit on a recording material may be provided.
In another aspect of the present invention, the image information supply unit may supply the image information to the toner image forming unit at a predetermined cycle.

  According to the present invention, in the image forming apparatus, it is possible to improve the stability of the color density important for the user.

[Configuration of the embodiment]
FIG. 1 is a block diagram showing a schematic configuration of an image forming apparatus 100 according to an embodiment of the present invention. The image forming apparatus 100 is an electrophotographic image forming apparatus that forms a color image using Y, M, C, and K color toners. The image forming apparatus 100 is roughly divided into an image reading unit 2, a sheet feeding unit 3, and an image. Each part of the forming part 4 is provided. In the image forming apparatus 100, these units are controlled by the apparatus control unit 1.

  FIG. 2 is a diagram schematically illustrating the configuration of the image reading unit 2, the paper feeding unit 3, and the image forming unit 4. The image reading unit 2 is a so-called scanner, and includes an automatic document feeder 201, a platen glass 202, and a scan unit 203. The document placed on the automatic document feeder 201 is conveyed to the platen glass 202 and is read by the scan unit 203. The scan unit 203 includes a lamp, a mirror, an imaging lens, and a line sensor (not shown), optically reads an image of a document, and generates image information representing the read image. The sheet feeding unit 3 includes a plurality of sheet storage units 301 that store sheets of various sizes, and a plurality of conveyance rolls 302 that convey the sheets, and supplies the designated size sheets to the image forming unit 4. To do.

  The image forming unit 4 rotates in the direction of arrow a in FIG. 2 to form photosensitive bodies 401Y, 401M, 401C, and 401K on which electrostatic latent images corresponding to the respective colors Y, M, C, and K are formed. By irradiating the charged photoconductors 401Y, 401M, 401C, and 401K with laser light according to the image represented by the supplied image information, and the charging devices 402Y, 402M, 402C, and 402K that charge the 401Y, 401M, 401C, and 401K The exposure devices 403Y, 403M, 403C, and 403K that form the electrostatic latent images, and the electrostatic latent images formed on the photosensitive members 401Y, 401M, 401C, and 401K are developed with toner, whereby the photosensitive members 401Y, 401M, 401C, and Developing devices 404Y, 404M, 404C, and 404K that form toner images on 401K, and developing devices 404Y and 404K , A 404C, Y corresponding to the respective devices 404K, M, C, toner supply device 405Y supplies the toner of K, 405M, 405C, and 405K.

  Further, the image forming unit 4 is stretched over the backup roll 409 and the drive roll 410 in a tensioned state, and is circulated and moved in the direction of the arrow b in the drawing while being in contact with the photoconductors 401Y, 401M, 401C, and 401K. The transfer belt 406 is opposed to the photoconductors 401Y, 401M, 401C, and 401K with the intermediate transfer belt 406 interposed therebetween, and a primary transfer roll that transfers the toner images on the peripheral surfaces of the photoconductors 401Y, 401M, 401C, and 401K to the intermediate transfer belt 406. 407Y, 407M, 407C, and 407K, a secondary transfer roll 408 that faces the backup roll 409 across the intermediate transfer belt 406, and secondarily transfers the toner image on the intermediate transfer belt 406 to the paper, and transferred to the paper A fixing device 411 that fixes the toner image on the sheet by heating and pressurizing the toner image. It is equipped with a.

  Further, the image forming unit 4 of the present embodiment includes a density sensor 414. The density sensor 414 is a sensor that measures the density of the image (toner image density) formed on the intermediate transfer belt 406. The density sensor 414 reads the image formed on the intermediate transfer belt 406 and outputs the density of the pixels constituting the read image. In the present embodiment, the density sensor 414 outputs 0 as the density when an image is not formed at the image reading position, and the density sensor 414 outputs a density when a solid image is formed at the reading position. Is output as 255.

  Next, the configuration of the device control unit 1 will be described. FIG. 3 is a block diagram showing the configuration of the device control unit 1. As shown in the figure, the control unit 1 includes a control unit 101, a storage unit 102, an image processing unit 103, an operation unit 104, and a communication unit 105, and these units are connected via a bus 110. ing. Although not shown in FIG. 3, the image reading unit 2, the paper feeding unit 3, and the image forming unit 4 are also connected to the bus 110.

  The control unit 101 includes a CPU (Central Processing Unit) 101A, a ROM (Read Only Memory) 101B, and a RAM (Random Access Memory) 101C. A control program is stored in the ROM 101B. When the CPU 101A executes the control program, each unit of the image forming apparatus 100 is controlled by the control unit 101, and an image such as an image forming function, an exposure potential, a toner supply amount to the developing unit, and the like. Various functions such as a process control function for stabilizing the density of the formed image are realized by controlling the physical quantity related to the density of the image.

  The storage unit 102 includes, for example, an HDD (Hard Disk Drive) that is a storage device, and stores patch image information representing the patch image shown in FIG. As shown in FIG. 4, the patch image has eight square images, and the color of each square is yellow (square Ya, square Yb) in the Y column and squares in the M column. The squares in the magenta (square Ma, square Mb) and C columns are cyan (square Ca, square Cb), and the squares in the K column are black (square Ka, square Kb). In this embodiment, the color density (pixel value) of the pixels constituting the square is in the range of 0 to 255, and the density of the squares Ya, Ma, Ca, and Ka is a predetermined density. The density of the squares Yb, Mb, Cb, and Kb is a predetermined density D2.

  The storage unit 102 also stores a potential table TBY, a potential table TBM, a potential table TBC, and a potential table TBK that are used when controlling the color density of the image represented by the image information. The potential table is stored for each color of Y, M, C, and K, and the exposure potential of the exposure apparatus when forming an electrostatic latent image of each density is stored in association with the density of 0 to 255. ing. FIG. 5 is a graph showing the correspondence between the density and the exposure potential. When the relationship between the density and the exposure potential is the relationship shown in FIG. 5, for example, when the density of a certain pixel in the image represented by the image information is D1, an electrostatic latent image of this pixel is formed on the photoconductor. The exposure potential is set to V11 in the exposure apparatus.

  The image processing unit 103 has a plurality of LSIs (Large Scale Integration), and performs image rotation processing, image size conversion processing, density correction processing, and the like on the image represented by the supplied image information. Then, the image processing unit 103 generates an image of each color of YMCK from the image that has been subjected to various processes, generates image information representing the generated image of each color, and supplies the image information to the corresponding color exposure apparatus.

  The operation unit 104 includes, for example, a touch panel type liquid crystal display, displays a menu screen or a message, gives various information to the user, and receives an instruction from the user. The communication unit 105 is connected to a communication network (not shown) such as a LAN (Local Area Network), functions as a communication interface that performs communication via the communication network, and is transmitted from an external device via the communication network. Receive image information and various information.

[Operation of the embodiment]
Next, the operation of this embodiment will be described. First, when the image forming apparatus 1 is turned on and the control program stored in the ROM 101B is executed in the control unit 101, the control unit 101 reads and reads the patch image information stored in the storage unit 102. The patch image information is supplied to the image processing unit 103. When the image information is supplied, the image processing unit 103 performs various processes on the image represented by the image information, generates images of each color Y, M, C, and K from the image subjected to the various processes, and generates the generated image. Is supplied to the corresponding color exposure apparatus.

  When the image information of the corresponding color is supplied, each exposure apparatus sets the exposure potential of the exposure apparatus when forming the image represented by the image information according to the potential table stored in the storage unit 102. For example, in the exposure apparatus 403Y corresponding to Y (Yellow), when the relationship between the density in the potential table TBY and the exposure potential is the relationship shown in FIG. 5, the density of the pixel of the square Ya is D1. As shown in FIG. 5, the exposure potential of the exposure device 403Y when forming the square Ya is set to V11, and an electrostatic latent image of the square Ya is formed on the photoreceptor 401Y with the set exposure potential. Further, when forming the electrostatic latent image of square Yb on the photoreceptor 401Y, the exposure device 403Y forms the square Yb because the density of the pixel of the square Yb is D2 from the relationship shown in FIG. The exposure potential at that time is set to V12, and a square Yb electrostatic latent image is formed on the photoconductor 401Y with the set exposure potential.

  In the exposure apparatus 403M corresponding to other M (Magenta), the exposure apparatus 403C corresponding to C (Cyan), and the exposure apparatus 403K corresponding to K (black), the exposure apparatus according to the potential table stored in the storage unit 102 The exposure potential is set as in 403Y, and a square electrostatic latent image of each color is formed on the photoconductor. When the formation of each square electrostatic latent image in the patch image is completed, the image forming unit 4 is controlled, and each square toner image is formed on the intermediate transfer belt 406. Then, the intermediate transfer belt 406 on which the toner image is formed is moved around, and each square image is read. The density of the read image is stored in the storage unit 102 for each square.

  When the control unit 101 obtains the density of each square color in the patch image, it next creates a correction potential table for each of Y, M, C, and K colors. For example, when the density of the square Ya formed on the intermediate transfer belt is Dm1 thinner than D1 as a result of the density measurement, when creating a Y (yellow) correction potential table, first, the control unit 101 first sets the potential table TBY. Is used to determine from the potential table TBY the difference ΔV1 between the exposure potential V11 when forming an image of density D1 and the exposure potential V13 when forming an image of density Dm1 (FIG. 5). Then, the control unit 101 obtains a potential V11 + ΔV1 when this ΔV1 is added to the exposure potential V11 (the potential at the point P1 in FIG. 5).

  If the density of the square Yb formed on the intermediate transfer belt is Dm2 thinner than D2 as a result of density measurement, the control unit 101 uses the potential table to perform exposure when forming an image of density D2. A difference ΔV2 between the potential V12 and the exposure potential V14 when forming an image having the density Dm2 is obtained from the potential table (FIG. 5). Then, the control unit 101 obtains a potential V12 + ΔV2 when this ΔV2 is added to the exposure potential V12 (the potential at the point P2 in FIG. 5).

  When the control unit 101 obtains the point P1 and the point P2, it interpolates between the origin of the graph and the exposure potential Vmax at the point P1, the point P2, and the density of 255 as shown in FIG. Then, a correction potential table is created, and the created table is stored in the storage unit 102. The control unit 101 creates correction potential tables in the same manner for other magenta, cyan, and black. After the creation of the correction potential table for each color is completed, for example, when image information is received by the communication unit 105, the received image information is supplied to the image processing unit 103. When the image information is supplied, the image processing unit 103 generates an image of each color of Y, M, C, K from the image represented by the image information, and the image information of the generated image of each color of Y, M, C, K is generated. Supply to exposure apparatus. When the image information is supplied, each exposure apparatus sets an exposure potential for forming an image represented by the image information in accordance with a correction potential table stored in the storage unit 102, and displays an electrostatic latent image on the photoconductor. Form. In the image forming apparatus 100, when the formation of the electrostatic latent image represented by the image information is completed, the image forming unit 4 is controlled, and the electrostatic latent image is developed by the developing device, and the toner image is transferred to the intermediate transfer belt 406. It is formed. The image formed on the intermediate transfer belt 406 is transferred to a sheet supplied from the sheet feeding unit 3 at a position where the secondary transfer roll 408 is located. The sheet on which the toner image has been transferred is fixed on the sheet by the fixing device 411 and is discharged out of the image forming apparatus 100.

  In addition, when the creation of the correction potential table is completed using the patch image, the image forming apparatus 100 uses the patch image after a predetermined time has elapsed and uses the patch image to perform each of the Y, M, C, and K colors in the same operation as described above. The correction potential table is updated. In this way, by updating the correction potential table at a predetermined cycle, the exposure potential is controlled even if the surrounding environment of the image forming apparatus 100 changes or the state of the photosensitive member or the developing device changes. Therefore, fluctuations in concentration can be suppressed.

  Next, an operation for stabilizing the color density important to the user will be described. First, the user operates the operation unit 104 to display the menu screen illustrated in FIG. 7 on the liquid crystal display of the operation unit 104. After the menu screen shown in FIG. 7 is displayed, the user operates the touch panel of the operation unit 104 to set the color density that he / she attaches importance to. Specifically, the user obtains the density of each color when the emphasized colors are represented by Y, M, C, and K colors. Then, the obtained densities of Y, M, C, and K are set on the menu screen shown in FIG. For example, when the color emphasized by the user is red, the density of Y of this red is 192, and the density of M is 64, the Δ / ▽ portion of the touch panel is operated to increase or decrease the density value. , Y is set to 192, M is set to 64, and C and K are set to 0. When the setting of the density of each color is completed and the user touches the “setting” portion in the menu screen, the control unit 101 stores the set density of each color of Y, M, C, and K as user density information. Remember me.

  Next, the control unit 101 reads the patch image information stored in the storage unit 102 and supplies the read patch image information to the image processing unit 103. When the patch image information is supplied, the image processing unit 103 sets the density of the square color in the patch image represented by the patch image information according to the stored user density information. For example, as described above, when Y is 192, M is 64, and C and K are stored as user density information, the density of squares Ya and Yb is 192, the density of squares Ma and Mb is 64, and square Ca , Cb and squares Ka, Kb are set to zero.

  Next, the image processing unit 103 generates image information of each of the Y, M, C, and K colors from the patch image whose density is set according to the user density information, and supplies the generated image information to the exposure apparatus. When the image information of the corresponding color is supplied, each exposure apparatus sets the exposure potential of the exposure apparatus when forming the image represented by the image information according to the potential table stored in the storage unit 102. For example, when the relationship between the density in the Y correction potential table and the exposure potential is the relationship shown in FIG. 8, the exposure apparatus 403 </ b> Y indicates that the density of the pixel of the square Ya is 192 as shown in FIG. 8. The exposure potential of the exposure device 403Y when forming the square Ya is set to V15, and an electrostatic latent image of the square Ya is formed on the photoreceptor 401Y with the set exposure potential.

  In the other exposure apparatuses 403M, 403C, and 403K, the exposure potential is set in the same manner as the exposure apparatus 403Y, and a square electrostatic latent image of each color is formed on the photoconductor. When the formation of each square electrostatic latent image in the patch image is completed, the image forming unit 4 is controlled, and each square toner image is formed on the intermediate transfer belt 406. Then, the intermediate transfer belt 406 on which the toner image is formed is moved around, and each square image is read. The density of the read image is stored in the storage unit 102 for each square.

  When the density of each square color in the patch image is obtained in this way, the control unit 101 creates a user correction potential table for each of Y, M, C, and K colors. For example, assuming that the density of the square Ya formed on the intermediate transfer belt is Dm3 thinner than 192, which is the density set by the user, when creating the Y correction potential table, first, the control unit 101 first displays the correction potential table. Is used to determine the difference ΔV3 between the exposure potential V15 when forming an image with a density of 192 and the exposure potential V16 when forming an image with a density of Dm3 from the correction potential table (FIG. 8). Next, the control unit 101 obtains a potential V15 + ΔV3 when this ΔV3 is added to the exposure potential V15 (the potential at the point P3 in FIG. 8).

  Next, the control unit 101 interpolates between the origin of the graph, the point P3, and the exposure potential Vmax when the density is 255 to create a user correction potential table as shown in FIG. Is stored in the storage unit 102. The control unit 101 similarly creates a user correction potential table for other magenta, cyan, and black. After the creation of the correction potential table for each color is completed, for example, when image information is received by the communication unit 105, the received image information is supplied to the image processing unit 103. When the image information is supplied, the image processing unit 103 generates images of Y, M, C, and K colors from the image represented by the image information. Then, the generated image information of each color image of Y, M, C, and K is supplied to the exposure apparatus. When the image information is supplied, each exposure apparatus sets an exposure potential for forming an image represented by the image information in accordance with a user correction potential table stored in the storage unit 102, and sets an electrostatic latent image on the photosensitive member. Form an image. In the image forming apparatus 100, when the formation of the electrostatic latent image represented by the image information is completed, the image forming unit 4 is controlled, and the electrostatic latent image is developed by the developing device, and the toner image is transferred to the intermediate transfer belt 406. It is formed. The image formed on the intermediate transfer belt 406 is transferred to a sheet supplied from the sheet feeding unit 3 at a position where the secondary transfer roll 408 is located. The sheet on which the toner image has been transferred is fixed on the sheet by the fixing device 411 and is discharged out of the image forming apparatus 100.

  Further, when the creation of the correction potential table for the user using the patch image is completed, the image forming apparatus 100, when the user density information is stored in the storage unit 102 after a predetermined time has elapsed, The user correction potential table is updated using the patch image having the set density. In this way, by updating the user correction potential table at a predetermined cycle, the exposure potential can be maintained even if the surrounding environment of the image forming apparatus 100 changes or the state of the photosensitive member or the developing device changes. It is possible to suppress variation in density by being controlled.

  As described above, according to the present embodiment, since density control is performed using a patch image having a color with importance placed on the user, the reproducibility of the color emphasized by the user is stabilized.

[Modification]
As mentioned above, although embodiment of this invention was described, embodiment mentioned above is an example of embodiment which concerns on this invention, This invention is not limited to embodiment mentioned above, It can implement with other various forms. It is. For example, the present invention may be implemented by modifying the above-described embodiment as follows.

In the embodiment described above, the Y, M, C, and K densities of colors that are important to the user may be directly input as numerical values using a numeric keypad. Alternatively, the image reading unit 2 may read an image having a color emphasized by the user, generate Y, M, C, and K images from the read image, and obtain the density of each color. Then, the obtained density may be stored as user density information, and a patch image may be generated using the stored user density information.
Further, the color that the user places importance on may be set by R (red), G (green), and B (blue). Then, the set color may be separated into Y, M, C, and K components, the density of each separated color may be stored as user density information, and a patch image may be generated using the stored user density information.
In the above-described embodiment, the density of colors Y, M, C, and K that are important to the user is set by the user operating the operation unit 104, but is transmitted via the communication network. Information representing the Y, M, C, K density of the color that the user attaches importance to is received by the communication unit 106, and the user expresses the Y, M, C, K density of the color that the user attaches importance based on the received information. You may make it set density information.

In the embodiment described above, the patch image may be transferred and fixed on a sheet, the density of the patch image after fixing may be measured, and the user correction table may be created with the measured density.
In the above-described embodiment, the aspect of correcting the density by controlling the exposure potential has been described. However, the density is controlled by process control in the electrophotographic image forming apparatus such as the amount of developing toner. The density may be corrected by controlling the physical quantity.

In the embodiment described above, an image representing a button for resetting user density information may be displayed on the screen shown in FIG. When an operation of touching this image portion is performed on the touch panel, user density information is initialized (for example, all densities are set to 0) or user density information is deleted from the storage unit 102. You may make it do. Further, when the user density information is initialized or erased in this way, the image forming apparatus 100 uses the patch image information stored in the storage unit 102 and uses a density correction table based on a predetermined density. You may make it create.
Further, a method for operating the operation unit 104 to create a density correction table using the density represented by the user density information, and a method for creating a density correction table using a predetermined density represented by the image of the patch image information, May be switched.

1 is a block diagram illustrating a schematic configuration of an image forming apparatus according to an embodiment of the present invention. FIG. 2 is a diagram schematically illustrating a configuration of the image forming apparatus. It is the block diagram which showed the structure of the apparatus control part. It is the figure which illustrated the patch image concerning the embodiment. It is the graph which illustrated the relationship between the density | concentration in an electric potential table, and exposure potential. It is the graph which illustrated the relationship between the density | concentration in a correction potential table, and exposure potential. 6 is a diagram illustrating a menu screen displayed on an operation unit 104. FIG. It is the graph which illustrated the relationship between the density | concentration in an electric potential table, and exposure potential. It is the graph which illustrated the relationship between the density | concentration in a correction potential table, and exposure potential.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Device control part, 2 ... Image reading part, 3 ... Paper feed part, 4 ... Image formation part,
DESCRIPTION OF SYMBOLS 100 ... Image forming apparatus, 101 ... Control part, 102 ... Memory | storage part, 103 ... Image processing part, 104 ... Operation part, 105 ... Communication part

Claims (4)

An instruction for changing the set density of the density control patch image for at least one color is received from the outside, and the density of the density control patch image for which the density change is instructed by the received change instruction is set according to the change instruction Concentration setting means for
Means for forming a toner image of an image represented by the supplied image information, wherein the toner image forming means controls the density of the toner image to be formed according to predetermined density control information;
Image information of an evaluation image having a predetermined area for each color for which the density is set by the density setting means and the density of the color in the area being the density set by the density setting means is sent to the toner image forming means. Image information supply means to supply;
Measuring means for measuring the density of the toner image of the evaluation image formed by the toner image forming means for each region;
An image forming apparatus comprising: a correcting unit that corrects the density control information in accordance with a density difference between the color density of the region measured by the measuring unit and the color density set by the density setting unit. Image reading means for reading an image formed on the recording material;
A density analysis unit that decomposes an image read by the image reading unit into a plurality of predetermined color images, and analyzes a density of the decomposed image of each color;
The image forming apparatus according to claim 1, wherein the density setting unit sets the density of each of the predetermined plurality of colors to a density analyzed by the density analysis unit.   The image forming apparatus according to claim 1, further comprising an image forming unit that forms a toner image formed by the toner image forming unit on a recording material.   The image forming apparatus according to claim 1, wherein the image information supply unit supplies the image information to the toner image forming unit at a predetermined cycle.

Images