JP2017024252A - Image forming device, printed matter and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device for printing a hiding layer having a higher concealability on a confidential image, compared with a case without printing on the confidential image with the chromatic multicolor including chromatic colors of the confidential image.SOLUTION: A scratch data detection part 22 detects scratch data for hiding a confidential image from image data. A print part 25 prints an image on a paper sheet. A print control part 24 controls the print part 25, after printing the confidential image with chromatic colors, to have the scratch data detected by the scratch data detection part 22 printed on the confidential image with chromatic multicolor including chromatic colors of the confidential image.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an image forming apparatus, a printed matter, and a program.

  Patent Document 1 includes a peelable concealment information layer printed by normal printing or electrostatic printing using a normal release ink or a non-magnetic one-component toner with a transparent release agent. There is disclosed a scratch printed matter comprising a colored layer made of a colored ink to be coated from above the layer, wherein the colored layer just above the peelable concealing information layer can be peeled off.

JP 2004-34578 A

  As in the case of lotteries, when performing a lottery or a lottery for numbers, a peelable transparent release layer is provided on the top of the image to be concealed on the printed material, and the concealment is performed on the transparent release layer. By printing ink, there is a case where a so-called scratch printed matter having a scratch portion in which a portion on which information such as hit or miss or number is printed is concealed may be used. When the concealed information is confirmed, the concealed ink is peeled off by scraping the scratch portion with a coin or the like, so that the concealed information can be confirmed. However, in the conventional method, in order to conceal the image to be concealed, a printing machine using a special material having a peeling property for forming the transparent peeling layer is required, which is realized in a general printing machine. I couldn't.

  An object of the present invention is to provide an image forming apparatus capable of printing a concealment layer having a high concealment property on a confidential image as compared with a case where the chromatic multi-color including a chromatic color of the confidential image is not printed. And to provide a program.

The present invention according to claim 1 is a printing means for printing on a recording medium;
After the secret image is printed on the recording medium with a chromatic color, concealment image data for concealing the secret image is printed on the secret image with a chromatic multi-color including at least the chromatic color of the secret image. Control means for controlling the printing means;
An image forming apparatus having

  The present invention according to claim 2 is characterized in that the control means sets a chromatic color different from the chromatic color of the secret image among the chromatic multi-colors of the hidden image data to be the same as or the density of the secret image. The image forming apparatus according to claim 1, wherein the printing unit is controlled to print around the secret image at a different density within a predetermined range.

  According to a third aspect of the present invention, the control unit controls the printing unit to fix the image of the hidden image data on the recording medium at a fixing temperature lower than a fixing temperature when fixing the secret image. The image forming apparatus according to claim 1 or 2.

  According to a fourth aspect of the present invention, the control means controls the printing means to print the concealed image data at a density higher than a chromatic color when the concealed image is printed. The image forming apparatus according to claim 1.

The present invention according to claim 5 is a detection means for detecting the concealed image data from identification information embedded in the image data;
Separating means for separating the hidden image data from the image data;
5. The image forming apparatus according to claim 1, wherein the control unit generates page information different from the image data of the concealed image data separated by the separation unit.

  According to a sixth aspect of the present invention, after the control unit prints an image of image data other than the concealed image data separated by the separating unit on the recording medium, the control unit stores the concealed image data based on the page information. The image forming apparatus according to claim 5, wherein the printing unit is controlled to print an image on the recording medium.

  The present invention according to claim 7 notifies that the recording medium on which the confidential image has been printed is again installed in a predetermined recording medium supply unit after the confidential image has been printed on the recording medium. The image forming apparatus according to claim 1, further comprising a notification unit configured to perform notification.

In the present invention according to claim 8, the secret image is printed on the recording medium with a chromatic color,
The concealment image for concealing the concealment image is a printed matter printed on the concealment image with a chromatic multi-order color including the chromatic color of the concealment image.

  In the present invention according to claim 9, a chromatic color different from the chromatic color of the secret image among the chromatic multi-colors included in the hidden drawing image is the same as the secret image or a predetermined range of the density. The printed matter according to claim 8, wherein the printed matter is printed around the secret image at different densities.

  The present invention according to claim 10 is the printed matter according to claim 8 or 9, wherein the concealed image is fixed on the recording medium with a fixing power lower than the fixing power of the secret image.

According to the eleventh aspect of the present invention, the concealment image data for concealing the concealment image after the concealment image is printed on the recording medium with a chromatic color is represented by the chromatic multi-order color including the chromatic color of the concealment image. Controlling to print on the confidential image;
Is a program for causing a computer to execute.

  According to the first aspect of the present invention, it is possible to print a concealment layer having a high concealment property on the confidential image as compared with the case where the chromatic multi-color including the chromatic color of the confidential image is not printed on the confidential image. An image forming apparatus can be provided.

  According to the second aspect of the present invention, it is possible to provide an image forming apparatus capable of improving the concealment property of the secret image as compared with the case where printing is not performed around the secret image.

  According to the third aspect of the present invention, the concealment layer having high peelability on the concealed image compared to the case where the image of the concealment image data is not fixed at a fixing temperature lower than the fixing temperature at the time of fixing the concealed image. Can be provided.

  According to the fourth aspect of the present invention, it is possible to provide an image forming apparatus capable of improving the concealment property of the secret image as compared with the case where the concealment image data is printed at a density equal to or lower than the density of the secret image. it can.

  According to the fifth aspect of the present invention, it is possible to provide an image forming apparatus capable of concealing a secret image without creating page information of concealment image data in advance.

  According to the sixth aspect of the present invention, it is possible to provide an image forming apparatus capable of printing a concealment layer on a concealed image.

  According to the seventh aspect of the present invention, there is provided an image forming apparatus capable of allowing a user to grasp an operation for printing concealment image data on a recording medium on which a concealment image is printed after the concealment image is printed. Can be provided.

  According to the eighth aspect of the present invention, a concealment layer having a high concealment property is printed on the concealment image as compared with a case where the chromatic multi-order color including the chromatic color of the concealment image is not printed on the concealment image. Printed materials can be provided.

  According to the ninth aspect of the present invention, it is possible to provide a printed matter having a high concealment property for the confidential image as compared with a case where printing is not performed around the confidential image.

  According to the tenth aspect of the present invention, the concealment layer having high peelability is provided on the concealment image as compared with the case where the image of the concealment image data is not fixed at a fixing temperature lower than the fixing temperature when the concealment image is fixed. A printed matter can be provided.

  According to the eleventh aspect of the present invention, it is possible to print a concealment layer having high concealment on the concealment image as compared with the case where the chromatic multi-order color including the chromatic color of the concealment image is not printed on the concealment image. A program can be provided.

1 is a diagram illustrating an image forming system according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a printing mechanism of the image forming apparatus 2 according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a hardware configuration of an image forming apparatus 2 according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a functional configuration of an image forming apparatus 2 according to an embodiment of the present invention. It is a figure which shows an example of the image data in one Embodiment of this invention. It is a figure which shows an example of the scratch area | region 40 in one Embodiment of this invention. It is a figure which shows an example of the scratch page in one Embodiment of this invention. It is a figure which shows an example of the image data after isolation | separation of the scratch data 50 in one Embodiment of this invention. FIG. 4 is a diagram illustrating an example of a fixing temperature of a fixing device 150 according to an embodiment of the present invention. It is a figure which shows an example of the scratch area | region 40 after printing in one Embodiment of this invention. 4 is a flowchart illustrating a flow of printing processing of the image forming apparatus 2 according to an embodiment of the present disclosure.

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

  FIG. 1 is a diagram illustrating an example of an image forming system according to an embodiment of the present invention.

  As illustrated in FIG. 1, the image forming system according to the present embodiment includes a terminal device 1 and an image forming device 2. Further, the terminal device 1 and the image forming apparatus 2 are connected to each other via the network 3.

  The image forming apparatus 2 in the present embodiment receives image data including a concealment target secret image created in the terminal device 1 via the network 3, and based on the received image data, an image is formed on a sheet (recording medium). Print. In addition, the image forming apparatus 2 in the present embodiment performs printing using toners of four colors, CMYK (cyan, magenta, yellow, and black).

  FIG. 2 is a schematic diagram of a printing mechanism of the image forming apparatus 2 in the present embodiment.

  As shown in FIG. 2, the image forming apparatus 2 in the present embodiment includes, for example, four image forming units 100 (100Y, 100M, 100C, and 100K in the present embodiment) that form toner images of respective colors by an electrophotographic method. ), An intermediate transfer belt 110 that transfers and holds each color toner image formed by the image forming unit 100 (primary transfer), a conveyance roller 120 that conveys paper, and a superposed toner that is primarily transferred to the intermediate transfer belt 110 A secondary transfer device 130 for secondary transfer of the image onto the paper, a transport belt 140 for transporting the secondary transferred paper, and a fixing device for fixing the secondary transferred image onto the paper at a predetermined fixing temperature. 150 and a print control unit 24 that controls the operation of each unit constituting the image forming apparatus 2. The paper on which the image is fixed by the fixing device 150 is discharged to a discharge port (not shown).

  Next, the hardware configuration of the image forming apparatus 2 in the image forming system of the present embodiment will be described with reference to FIG.

  As shown in FIG. 3, the image forming apparatus 2 according to the present embodiment includes a CPU 11, a memory 12, a storage device 13 such as a hard disk drive (HDD), and a terminal device 10 and a server device 30 via a network line 40. A communication interface (IF) unit 14 for transmitting and receiving data, a user interface (UI) device 15 constituted by a touch panel and a liquid crystal display, and a printing unit 16 for printing an image on a recording medium such as paper. These components are connected to each other via a control bus 17.

  The CPU 11 executes predetermined processing based on a print control program stored in the memory 12 or the storage device 13 to control the operation of the image forming apparatus 2.

  FIG. 4 is a block diagram showing a functional configuration of the image forming apparatus 2 realized by executing the above-described print control program.

  As shown in FIG. 4, the image forming apparatus 2 includes an image data reception unit 21, a scratch data detection unit 22, a scratch data separation unit 23, a print control unit 24, a printing unit 25, and a notification unit 26. Composed.

  The image data receiving unit 21 receives image data from the terminal device 1 via the network 3. In the present embodiment, as shown in FIG. 5, image data in which the scratch area 40 is designated in the terminal device 1 is received. In the present embodiment, as shown in FIG. 6, the scratch area 40 includes scratch data 50 (hidden image data), a secret image 51, and a peripheral area 52 that is a peripheral area of the secret image 51. ing.

  The scratch data detection unit 22 detects scratch data 50 for concealing the secret image 51 from the image data. In this embodiment, when creating image data in the terminal device 1, the identification information of the scratch data 50 is embedded in the image data and embedded in the image data received from the terminal device 1 by the image data receiving unit 21. The scratch data 50 is detected from the identification information of the scratch data 50.

  The scratch data separation unit 23 separates the scratch data 50 detected by the scratch data detection unit 22 from the image data. For example, as shown in FIGS. 7 and 8, the received image data is separated into scratch data 50 and image data other than the scratch data 50.

  The print control unit 24 generates a scratch page (page information) different from the image data of the scratch data 50 separated by the scratch data separation unit 23. Specifically, as shown in FIG. 8, the print control unit 24 generates a scratch page in which the scratch data 50 separated by the scratch data separation unit 23 is arranged at the same position as the scratch area 40.

  The print control unit 24 also controls the printing unit 25 to print image data other than the scratch data 50 separated by the scratch data separation unit 23 on a sheet. At this time, the printing unit 25 prints the secret image 51 with a chromatic color. Then, after printing an image of image data other than the scratch data 50 on a sheet, the image of the scratch data 50 is printed on the confidential image 51 using a chromatic multi-color including the chromatic color of the confidential image 51 based on the scratch page. The printing unit 25 is controlled to do so. Further, the print control unit 24 sets the chromatic color different from the chromatic color of the secret image 51 among the chromatic multi-colors of the scratch data 50 to be the same as or different from the density of the secret image 51 in a predetermined range. The printing unit 25 is controlled to print in the peripheral area 52 with the density. Further, the print control unit 24 controls the printing unit 25 to print the scratch data 50 at a density higher than the chromatic color when the secret image 51 is printed.

  In the present embodiment, the chromatic multi-order color of the scratch data 50, the chromatic color of the secret image 51, and the chromatic color of the peripheral area 52 are set when the terminal device 1 creates image data. For example, as shown in FIGS. 7 and 8, in the terminal device 1, the secret image 51 has a density of 30% cyan, the surrounding area 52 has a density of 30% magenta, and the scratch data 50 has a density of 100% cyan and 100% magenta. It is set for each concentration.

  In the present embodiment, the chromatic color is a color composed of one or more colors of CMY, and the chromatic multi-color is a color composed of two or more colors of CMY and is a chromatic color. It is assumed that the color is composed of more colors.

  Further, the print control unit 24 causes the printing unit 25 to fix the image of the scratch data 50 detected by the scratch data detection unit 23 on the paper at a fixing temperature lower than the fixing temperature when fixing the secret image 51. Control.

  The printing unit 25 prints an image on a sheet based on the control of the print control unit 24.

  The notification unit 26 sets the paper on which the confidential image 51 is printed again in the predetermined paper supply unit by displaying the confidential image 51 on a display device (not shown) after the confidential image 51 is printed on the paper. To be notified. For example, as a notification that the paper is to be set again in a predetermined paper supply unit, the notification unit 26 urges the user to set the paper on which the confidential image 51 is printed on the manual feed tray via a display device (not shown). Display.

  Next, an example of the fixing temperature of the fixing device 150 in this embodiment will be described in detail with reference to FIG.

  In order to sufficiently fix the image on the paper in the image forming apparatus 2, it is necessary to raise the temperature of the fixing device 150 to an appropriate fixing temperature corresponding to the type of paper and then fix the image. In the present embodiment, in the image forming apparatus 2, the fixing device 150 changes the fixing temperature according to the type of paper under the control of the print control unit 24. For example, as shown in FIG. 9A, when there is an instruction to print on thick paper, the print control unit 24 raises the temperature of the fixing device 150 to the fixing temperature T1 and prints the image on the paper. If there is an instruction to perform printing on plain paper, the temperature of the fixing device 150 is raised to the fixing temperature T3 to fix the image on the paper.

  In addition, when the fixing device 150 does not reach an appropriate fixing temperature according to the type of paper, the fixing power of the toner becomes low, so that the toner cannot be sufficiently fixed on the paper and fixing failure occurs. In some cases, the toner tends to peel off from the discharged paper. For example, when the toner causing the fixing failure is scraped off by a coin, a human nail or the like, the toner layer is peeled off and a layer below the toner layer is exposed.

  For example, as shown in FIG. 9A, when printing on thick paper, the image is fixed on the paper at a fixing temperature T2 lower than an appropriate fixing temperature T1 for fixing the image on the thick paper. In this case, a fixing failure occurs, and the image fixed at the fixing temperature T2 is easily peeled off from the paper.

  FIG. 9B shows an example of the correspondence relationship between the sheet type, the appropriate fixing temperature, and the fixing temperature at which fixing failure occurs in this embodiment. As a method for determining whether or not the fixing device 150 has reached a predetermined fixing temperature, for example, a temperature sensor is provided in the vicinity of the fixing device 150 so that the temperature of the fixing device 150 is managed. Also good.

  In the image forming apparatus 2 according to the present embodiment, when the image of the scratch data 50 printed on the secret image 51 is printed, it is fixed on the paper at a fixing temperature lower than an appropriate fixing temperature corresponding to the paper. Printing is performed such that fixing failure occurs intentionally and the printed image is easily peeled off based on the scratch data 50.

  Specifically, when printing on thick paper, the print control unit 24 fixes the secret image 51 on the paper at an appropriate fixing temperature T1 on the thick paper, and then the temperature of the fixing device 150 is set to the fixing temperature. The image printed based on the scratch data 50 is fixed on the paper when the temperature drops to a fixing temperature T2 that is lower than T1 and causes fixing failure on thick paper. In the present embodiment, the description will be made assuming that the temperature of the fixing device 150 decreases with time.

  Next, a specific example of printing processing in the image forming apparatus 2 of the present embodiment will be described in detail with reference to the drawings.

  First, when the paper is a thick paper, the print control unit 24 raises the fixing device 150 to the fixing temperature T1 corresponding to the thick paper to fix the secret image 51 on the paper, and then discharges the paper once. At this time, the print control unit 24 controls the printing unit 25 to perform printing based on the separated image data after the scratch data 50 is separated as shown in FIG. In the present embodiment, since the density of 30% cyan is set for the secret image 51 and the density of magenta 30% is set for the peripheral area 52 in the terminal device 1, printing is performed as shown in FIG. The control unit 24 controls the printing unit 25 to print the secret image 51 on a sheet with a cyan density of 30% and print magenta with a density of 30% in the peripheral area 52.

  After the confidential image 51 and the peripheral area 52 are printed on the paper, the notification unit 26 notifies that the paper on which the confidential image 51 is printed is placed on the manual feed tray.

  Then, the print control unit 24 controls the printing unit 25 to print the image of the scratch data 50 on the secret image 51 based on the scratch page. At this time, as shown in FIG. 8, the print control unit 24 sets the density of cyan 100% and magenta 100% with respect to the scratch data 50 in the terminal device 1. The confidential image 51 and the peripheral area 52 are printed on the image of the scratch data 50 based on the scratch page so that the printed image (hereinafter, scratch image 54) has a density of 100% cyan and 100% magenta. Print on paper.

  In the present embodiment, when the scratch image 54 is printed on the secret image, the fixing device 150 simply decreases from an appropriate fixing temperature T1 to a fixing temperature T2 at which fixing failure occurs with respect to thick paper over time. Explained as a thing. However, when the scratch image 54 is printed, when the temperature parameter setting of the fixing device 150 is changed to decrease from a fixing temperature T2 appropriate for thick paper to a fixing temperature T3 appropriate for plain paper, The scratch image 54 may be printed on the secret image 51.

  FIG. 10 is a diagram illustrating an example of the scratch area 40 after printing on a sheet in the present embodiment. FIG. 10A is an enlarged cross-sectional view of the scratch region 40, and FIG. 10B is a view showing the upper surface of the scratch region 40. FIG. 10C is a diagram showing an example after the scratch area 40 has been scraped with coins.

  As shown in FIG. 10A, in the present embodiment, the secret image 51 is printed on the paper 53 with a density of 30% cyan, and magenta with a density of 30% is printed in the peripheral area 52. Further, as shown in FIG. 10A, the scratch image 54 is printed on the secret image 51 at a density of 100% cyan and 100% magenta. By printing in this way, as shown in FIG. 10B, the scratch image 54 is formed so as to hide the secret image 51.

  In FIG. 10B, for the sake of explanation, the secret image 51 concealed in the scratch image 54 is indicated by a dotted line. However, in actuality, the scratch image 54 includes the secret image 51 and the presence of the peripheral area 52. Since it is a chromatic multi-color including chromatic colors and is printed at a higher density than the secret image 51, the scratch image 54 can be seen through and the secret image 51 cannot be viewed.

  Further, as described above, the scratch image 54 is printed on the secret image 51 at the fixing temperature T2 at which fixing failure occurs at a temperature lower than the appropriate fixing temperature T1 for thick paper. Therefore, the fixing force of the scratch image 54 is lower than the fixing force of the secret image 51 due to poor fixing, and is easily peeled off. Then, as shown in FIG. 10C, when the scratch area 40 is scraped with a coin or the like, the scratch image 54 is peeled off and the secret image 51 can be visually recognized.

  In the present embodiment, the description has been made assuming that the paper 53 is once discharged after the secret image 51 is fixed on the paper. However, in the case where the image forming apparatus 2 has a reprint mechanism capable of performing a reprint operation by transporting the paper 53 to the image forming unit 100 again after fixing the secret image 51 on the paper 53. After the secret image 51 is printed, the printing of the scratch data 50 is started when the temperature of the fixing device 150 decreases from the fixing temperature T1 to the fixing temperature T2 over time without discharging the paper 53 once. Also good.

  Next, the flow of the printing process of the image forming apparatus 2 in the present embodiment will be described with reference to the flowchart of FIG.

  First, the image data reception unit 21 determines whether the image data received from the terminal device 1 is scratch printing (step S101). For example, the image data receiving unit 21 determines whether the identification information of the scratch data 50 is detected from the image data. If it is not scratch printing (no in step S101), the image forming apparatus 2 ends the printing process.

  In the case of scratch printing (yes in step S101), the scratch data detection unit 22 detects the scratch data 50 from the identification information embedded in the image data (step S102).

  Next, the scratch data separation unit 23 separates the scratch data 50 detected by the scratch data detection unit 22 and the image data (step S103).

  Then, the printing unit 25 prints the separated image data (step S104). At this time, the printing unit 25 prints the secret image 51 set in the terminal device 1 with a chromatic color. In addition, the printing unit 25 applies a chromatic color different from the confidential image 51 to the peripheral region 52 at a density that is the same as or different from the density of the chromatic color of the secret image 51 set in the terminal device 1 in a predetermined range. Print on.

  Next, the print control unit 24 determines whether or not the image forming apparatus 2 has a follow-up printing mechanism (step S105). If it has a reprint mechanism (yes in step S105), the process proceeds to step S107. If it does not have a reprint mechanism (no in step S105), the image forming apparatus 2 temporarily loads the paper. It discharges (step S106).

  In addition, the notification unit 26 notifies that the paper 53 once discharged in step S106 is to be placed on the manual feed tray again (step S107).

  Then, the print control unit 24 reduces the temperature of the fixing device 150 (step S108). In the present embodiment, the temperature of the fixing device 150 decreases with time.

  Further, the print control unit 24 determines whether or not the temperature of the fixing device 150 has decreased to the fixing temperature T2 (step S109). If the temperature of the fixing device 150 has not decreased to the fixing temperature T2 (no in step S109), the process returns to step S107.

  When the temperature of the fixing device 150 has decreased to the fixing temperature T2 (yes in step S109), the printing unit 25 prints the scratch data 50 (step S110). At this time, based on the scratch page separated by the scratch data separation unit 23, the print control unit 24 converts the scratch image 54 into the chromatic color of the secret image set in the terminal device 1 and the chromatic color of the peripheral region 52. The printing unit 25 is controlled to print on the confidential image 51 with chromatic multi-colors including

  In the present embodiment, it has been described that the scratch data 50 is printed when the temperature of the fixing device 150 decreases from the fixing temperature T1 to the fixing temperature T2 as time elapses. The scratch data 50 may be printed by changing the conveyance speed of the sheet passing through the fixing device 150 without changing the fixing temperature 150. Further, by blowing air over the paper, the characteristics of the paper may be changed to cause poor fixing of the scratch image 54.

1 Terminal Device 2 Image Forming Device 3 Network 11 CPU
12 Memory 13 Storage device 13
14 Communication IF
DESCRIPTION OF SYMBOLS 15 UI apparatus 16, 25 Printing part 17 Control bus 21 Image data reception part 22 Scratch data detection part 23 Scratch data separation part 24 Print control part 26 Notification part 40 Scratch area 50 Scratch data 51 Confidential image 52 Peripheral area 53 Paper 54 Scratch image 100, 100C, 100M, 100Y, 100K Image forming unit 110 Intermediate transfer belt 120 Conveying roller 130 Secondary transfer device 140 Conveying belt 150 Fixing device

Claims (11)

Printing means for printing on a recording medium;
After the secret image is printed on the recording medium with a chromatic color, concealment image data for concealing the secret image is printed on the secret image with a chromatic multi-color including at least the chromatic color of the secret image. Control means for controlling the printing means;
An image forming apparatus.   The control means sets a chromatic color different from the chromatic color of the secret image among the chromatic multi-colors of the hidden image data at a density that is the same as the density of the secret image or different from the density in a predetermined range. The image forming apparatus according to claim 1, wherein the printing unit is controlled to print around the secret image.   3. The image according to claim 1, wherein the control unit controls the printing unit to fix the image of the hidden image data on the recording medium at a fixing temperature lower than a fixing temperature when fixing the secret image. Forming equipment.   4. The image forming apparatus according to claim 1, wherein the control unit controls the printing unit to print the hidden image data at a density higher than a chromatic color when the secret image is printed. 5. . Detecting means for detecting the hidden image data from identification information embedded in the image data;
Separating means for separating the hidden image data from the image data;
5. The image forming apparatus according to claim 1, wherein the control unit generates page information of the hidden image data separated by the separation unit, which is different from the image data.   The control means prints the image of the hidden image data on the recording medium based on the page information after printing the image of the image data other than the hidden image data separated by the separating means on the recording medium. The image forming apparatus according to claim 5, wherein the printing unit is controlled.   2. The information processing apparatus according to claim 1, further comprising a notifying unit that notifies that the recording medium on which the confidential image is printed is again installed in a predetermined recording medium supply unit after the confidential image is printed on the recording medium. 7. The image forming apparatus according to any one of 6 to 6. The secret image is printed on the recording medium with a chromatic color,
A printed matter in which a concealment image for concealing the concealment image is printed on the concealment image with a chromatic multi-order color including a chromatic color of the concealment image.   A chromatic color different from the chromatic color of the hidden image among the chromatic multi-colors included in the hidden drawing image has the same density as the hidden image or a different density within a predetermined range from the density of the hidden image. The printed matter according to claim 8 printed on the paper.   The printed matter according to claim 8 or 9, wherein the hidden image is fixed on the recording medium with a fixing power lower than a fixing power of the secret image. After the secret image is printed on the recording medium with a chromatic color, the concealment image data for concealing the secret image is controlled to be printed on the secret image with a chromatic multi-color including the chromatic color of the secret image. Steps,
A program that causes a computer to execute.

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