JPH09179285A - Form plate inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a form plate inspection device which has a simple constitution and is capable of inspecting the form plate with proper inspection accuracy in accordance with the data structure (a pattern or the like) of the subject of form plate inspection by displaying different points on a display device so as to recognize the difference between images before and after layout. SOLUTION: The form plate inspection device is provided with an old version layout image memory 22 for fetching image data before the layout from a video signal for a display outputted from an editing layout device 11 to a display device 12, a new version layout image memory 23 for fetching the image data after the layout from the video signal for the display, a different point detecting part 24 for detecting different points between the image data stored in both memories 22 and 23 and a different data image memory 25 for storing the detected different points. Then, the image data before/after the layout are fetched from the video signal for the display outputted from the editing layout device 11 to the display device 12 and the different point between both image data is detected and displayed on the display device 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate inspection apparatus for performing a plate inspection operation by comparing image data to see if correction has been properly performed in a plate making process.

[0002]

2. Description of the Related Art Image data, graphic (CAD) data, and character data that make up a design of a printed matter are imported,
Desktop publishing (DTP), which lays out and edits on a display and outputs image data in a bitmap format for producing a film for platemaking, has come to be generally used in the field of platemaking.

By the way, usually, a printed matter is repeatedly upgraded and modified many times, and in that case, in order to check (verify) whether the modification is properly performed, the DTP is used.
The system compares the original image data of the printed matter with the corrected image data.

As an example of this type of plate inspection work, Japanese Patent Laid-Open No. 7-
There is a "digital plate inspection device" in Japanese Patent No. 219202, which is hereby cited and its outline will be described.

In FIG. 1, reference numeral 1 is an editing layout apparatus for editing a plurality of material data and laying them out at predetermined positions. Reference numeral 2 denotes data edited by the editing layout apparatus 1 in Y (yellow) and M. It is a (high resolution) RIP development device that converts image data in bitmap format for each color of (magenta), C (cyan), and K (black), and the image data is recorded in the film recording device 3, and the data is recorded. A YMCK four-color platemaking film is prepared based on the above. The above configuration is the DTP system described above.

A digital plate inspection device 8 is further added to this DTP. Reference numeral 81 is a resolution reduction device for converting the high resolution bitmap image data output from the RIP development device 2 into low resolution image data. 82
Is a data storage device, and stores the image data output from the resolution reduction device 81 as image data of an old version (before correction) through the data processing device 83. The data processing device 83 compares the image data of the new version (corrected) output next from the resolution reduction device 81 with the image data of the old version stored in the data storage device 82 in pixel units, and the difference is obtained. Detect points. Then, the data processing device 83 gives the new version of the image data to the display device 84 to display the image data, and blinks the detected difference in a specific color (first color). At the same time, the correction instruction point for the image data of the old version is displayed in blinking in the second color. From this, it is checked visually whether there are any missing corrections or unnecessary corrections.

A modified example of the frame A in FIG. 1 is shown in FIG. 2, in which the editing data from the editing layout device 1 is converted into low resolution image data by the low resolution RIP expansion device 810. It is supplied to the data processing device 83.

In the system of FIG. 1 or the system employing FIG. 2, since the resolution of the image data to be inspected is lowered, the memory capacity for storing the old and new image data can be reduced, and The advantage is that it is possible to shorten the processing time for performing data comparison in pixel units for plate inspection.

[0009]

However, in the above-mentioned system, the system becomes complicated because the resolution reduction device 81 or the low resolution RIP expansion device 810 is required to reduce the resolution of the image data, and Although the memory resolution and the plate inspection processing time can be shortened by lowering the resolution of the data, the plate inspection accuracy is correspondingly lowered, and accurate plate inspection cannot be performed.

Therefore, the present invention has a simple structure and
It is an object of the present invention to provide a plate inspection device that can be executed with appropriate plate inspection accuracy according to the data structure (pattern, etc.) of the plate inspection target.

[0011]

A plate inspection device (claim 1) of the present invention lays out material data such as photographs and characters on a display device (12) using an editing layout device (11). From the display video signal output from the editing layout device (11) to the display device (12), which is a device (21) for performing plate inspection in the plate making process for converting image data in bitmap format from The image data before and after the layout is taken in, the difference between the image data is detected, and the difference is displayed on the display device (12).

More specifically, the plate inspection apparatus of the present invention (claim 2)
Is a layout device for editing material data such as photographs and characters.
A device (21) for performing plate inspection in a plate making process of performing layout on a display device (12) using (11) and then converting to bitmap image data, the editing layout device (11) The image memory (22) for the old version layout that captures the image data before layout from the display video signal output from the display device (12) and the new version layout that captures the image data after the layout from the display video signal Image memory (23) and both memories (22,23)
Difference detection unit for detecting the difference between image data stored in the memory
(24) and a difference data image memory (25) for storing the detected difference, and displaying the difference on the display device (12) so that the difference between the two images before and after the layout can be seen. Is characterized by.

In the plate making system (claim 9) of the present invention, material data such as a photograph and a character is subjected to layout editing on the display device (12) using the editing layout device (11), and then a bitmap image is formed. In the plate making system for converting into data, the editing layout device (11) to the display device (12)
From the display video signal output to, the display data before and after the layout is stored, the difference between both display data is detected, and the plate inspection is performed based on the difference displayed on the display device (12). It is characterized by comprising a plate inspection device (21) for performing.

[0014]

The plate inspection apparatus of the present invention (claims 1 and 2) can be used in addition to the above-mentioned DTP system, and the system has reduced the resolution output as a video signal for display. Since the plate inspection is performed on the data, it is possible to reduce the memory capacity for capturing the data, and
The time required for plate inspection can be greatly reduced.

As a method of displaying the difference on the display device (12) so that the difference between the two images before and after the layout can be seen, there are, for example, the methods of claims 3 and 4, and the detailed operation thereof will be described below. 9 and the flowchart of FIG. 11, respectively.

Generally, the display video signal can change the display magnification on the display device by setting the resolution. However, according to the present invention, as described in claim 5,
The resolution setting is used as a means for setting the plate inspection accuracy. As a result, it is possible to perform an accurate plate inspection according to the contents of the image data to be plate-inspected.

Since the plate inspection apparatus of the present invention is supplied as file data downloaded through a floppy disk, a CDROM or a public line as described in claims 6 to 8, it can be applied to a small-scale DTP system. It can be applied at low cost.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION In this embodiment, as an editing layout apparatus, "QuarkXP" which is software released by Quark Co., Ltd.
Since "ress" is adopted, first, its own editing / layout function will be described with reference to FIG.

Material data includes photograph (image) data obtained by an image scanner, illustration (CAD) data created by CAD (Computer Aided Design), and keyboard-input character data. These data are individually Input to the edit layout device 11,
Individually stored in the internal memory having three storage areas,
Then, a video signal for display is created one by one based on these data, and three data are superimposed and displayed on the display device 12 in real time. Here, the input device (keyboard and mouse) 13 is used to lay out the illustration and the photograph at appropriate positions as shown on the monitor screen, and lay out the character "apple" under the photograph.
With the editing function, you can change the kana of an "apple" into katakana. In this way, the layout or edited data is updated and stored in the internal memory.

When the layout is completed, the image is printed out by the printer 14 for final confirmation, and if the layout is OK, the data stored in the internal memory is registered in the hard disk drive (HDD) 15. After this,
The image data registered in the HDD 15 is read, converted by the RIP developing device 16 into image data in the bitmap format, and supplied to the film recording device 17.

In this type of DTP, the number of pixels that can be displayed is determined according to the size of the display device, with the resolution of the monitor (the number of pixels per inch) being 72 dpi. On the other hand, in the editing layout apparatus 11 used here, as shown in FIG. 4, by specifying the resolution on the monitor screen, the actual size display (100%), reduced display (50%, 75%), enlarged display ( It can be switched to 200%). "Overall display" is a function to display the image to be inspected on the entire monitor screen, and "Thumbnail" is a function to reduce the image to be inspected and display multiple images side by side. Is. The display magnification is not limited to the value shown here, and any magnification and reduction ratio can be set.

FIG. 5 shows an actual size display (72 dpi) and a 200% enlarged display (144 dpi). If the editing layout data for inspection is width x height = 200 x 100 mm,
In the actual size display of the above figure, it is displayed with 567 × 283 pixels, whereas in the enlarged display shown below the same pattern is 1134 × 56
Since it is displayed with 7 pixels, the resolution is double that of the actual size display.

FIG. 6 shows a plate making system in which such an editing layout device 11 is equipped with a plate inspection device 21 of the present invention. In FIG. 6, the same elements as those in FIG. 3 are designated by the same reference numerals.

In the editing layout device 11, 11a
Is a layout unit for laying out photo data, illustration data, and character data at desired positions according to an instruction from the input device 13, and 11b is for displaying a display magnification corresponding to a designated resolution (dpi value). Although it is a display magnification changing unit that creates a video signal, the operation contents of the layout unit and the display magnification changing unit are unclear, so only one block is described.

In the plate inspection apparatus 21 according to the present invention, reference numerals 22 and 23 denote an image memory for the old version layout and an image for the new version layout, which selectively take in the display video signal output from the display magnification changing unit 11b. It is a memory. Reference numeral 24 denotes a difference detection unit that detects, in pixel units, the difference between the image data read from the old version layout image memory 22 and the new version layout image memory 23. 25
Is a difference data image memory that stores the difference points detected by the difference point detection unit 24 or the image data including the difference points. Reference numeral 26 denotes a window display unit, which takes in the data stored in the image memory 22 for the old version layout, the image memory 23 for the new version layout, and the image memory 25 for the difference data and the display video signal, and displays it in a desired window display. Output a display signal to the device 12,
It also outputs predetermined print data to the printer 14.

When the resolution is designated by the input device 13, the resolution selection menu shown in the upper diagram of FIG. 7 is displayed on the monitor screen. Here, the resolutions of 72 dpi and 144 dpi correspond to the actual size display and the 200% enlarged display shown in FIG. 4, respectively.
dpi is a 400% enlarged display.

To specify a desired one of these three types of resolution, use the mouse to move the cursor to the circle marked with the desired dpi value and click on. Here, 72 dpi is set. It shows the specified location. The resolution can be set to any other value, in which case 4
If you click the second circle, you can specify an arbitrary resolution, such as "100" dpi, as shown in the lower part of FIG.
Since the designation of the resolution is directly related to the plate inspection accuracy, in FIG. 7, “Low (accuracy)”, “Medium (accuracy)”, and “High (accuracy) indicating the plate inspection accuracy corresponding to each dpi value. ) ”Is also shown.

The operation of the plate making system based on the above configuration will be described with reference to the flowchart of FIG. First, in step S1, the mouse of the input device 13 is used to specify a desired resolution (plate inspection accuracy) in the resolution selection menu shown in FIG. If the image data to be inspected is dense, specify high resolution 288dpi (“high” precision). On the other hand, if the only correction is rewriting or moving characters, the low resolution 72dpi ( It is sufficient to specify "low" precision), and the plate inspection process can be performed in a short time at low resolution (low plate inspection precision). I chose a low resolution because it is a simple fix here. In this way, an appropriate resolution can be designated according to the image configuration of the plate inspection target.

In step S2, when the material data A of the photograph, illustration and character is stored in the internal memory of the editing layout apparatus 11, the display magnification changing unit 11b uses the data A to display the image for display with a resolution of 72 dpi. A signal (denoted as A ′) is created, and the display video signal A ′ is supplied to the window display unit 26, so that step S
3, the layout (pre-layout) image P of the old version is displayed at the upper left of the monitor screen as shown in the upper diagram of FIG.
1 is displayed.

In step S4, the display image P1 currently displayed is checked to determine whether or not the correction is necessary. When no correction is required, use the keyboard of the input device 13 to enter "N".
If the (confirmation signal) is input, the data A stored in the internal memory is finally registered in the HDD 15 in step S5.
Then, the data is supplied to the RIP developing device 16, and the Y, M, C, and K film forming information for each color is supplied to the film recording device 17.

On the other hand, when it is recognized that the correction is necessary, "Y" is input by the keyboard. As a result, the process proceeds from step S4 to step S6, and the display video signal A '(data reduced to 72 dpi) is stored in the old version layout image memory 22 (the stored data is referred to as A ₀ '. ).

In the next step S7, while inputting the correction data such as the movement of the photograph and the rewriting of the character by the input device 13 while looking at the image P1 displayed in the upper part of FIG. Original data stored in A
Is corrected by the layout unit 11a (the updated data after the correction is A ). The update data A is immediately generated by the display magnification changing unit 11b into a low-resolution display video signal of 72 dpi (referred to as A '), and is supplied to the window display unit 26, whereby in step S8,
The layout of the new version, as shown in the middle diagram in Figure 10.
The image P2 (after layout) is displayed side by side on the right side of the previous layout image P1 of the previous version. Step S9
Then, the display video signal A ′ (also the data whose resolution has been reduced to 72 dpi) is stored in the new version layout image memory 23.

[0033] In step S10, the differences detector 24, the difference between the data A ₀ 'and A' in the image memory 22 and the new version layout image memory 23 for the previous version layout with a dot (pixel) unit comparison The difference point D is stored in the difference data image memory 25. The details of the processing for the difference D are shown in the subroutine of FIG.

In step S21, for example, X is initialized to 0 as the start address, and in step S22, the X value is set as the address value. Then, step S23
In the new version layout image in the memory 23 of the storage data A address 'and the old version data A ₀ of the memory in the layout image memory 22' [X] Pixel data a ', a _0' is read out, step at S24, whether both dot data match (a '= a _0') is determined. In step S25, when they match, pixel data a ′ is written to that address, and when they do not match, pixel data indicating red is written to the same address.

In step S26, the value of X is incremented, and in step S27, it is determined from the value of X whether the data comparison for all the pixels to be inspected has been completed. If not, the process returns to step S22. When the comparison of all the pill cell data is completed, the process returns to FIG.

In step S11, the stored contents of the difference data image memory 25 are supplied to the window display unit 26, so that the layout images P1 of the old and new versions are displayed on the monitor screen as shown in the lower diagram of FIG. , P
The difference image P3 is displayed at the bottom of 2. In this difference image P3, the photograph and the illustration are displayed as they are because they have not been corrected, but since the character has been changed from "apple" to "red apple" and corrected, both characters are displayed in red. As a result, it is obvious at a glance which part has been corrected in the layout images of the old and new versions. The difference image P3 is checked to determine whether the correction this time was appropriate.

If the re-correction is not necessary, the process proceeds from step S12 to step S13, and the internal memory is replaced with step S.
The data A updated in 7 is registered in the HDD 15.
On the other hand, if re-correction is necessary, the process returns to step S7 and the layout is corrected again.

As described above, since the plate inspection is performed using the low-resolution data supplied as the display video signal from the editing layout device 11, the old and new version layout image memories 23 and 22 and the difference data image are used. The storage capacity of the memory 25 can be greatly reduced, and the processing time required for plate inspection can be greatly reduced. For example, the resolution of the data supplied from the editing layout apparatus 11 to the RIP expansion apparatus 16 is at least about 1000 dpi, and the resolution is 72 dp as in the present embodiment, as compared with when performing plate inspection on the raw data.
When performing plate inspection with i data, the memory capacity is (72/1000)
² ≈ 1/193 and the processing speed can be reduced to the same level. As an editing layout device, the above-mentioned “QuarkX
The type is not limited to “Press”, and any type that outputs a low-resolution display video signal may be used.

The subroutine of FIG. 9 is shown as an embodiment of the difference data processing in step S10 of FIG. 8, but another processing is shown in FIG. Here, the old and new version layout image memories 23 and 22 are
As shown in the upper diagram of FIG. 12, the cells are preliminarily divided into squares in a rectangular area, and it is determined whether or not there is a correction for each square.

First, in step S31, the cell number B
Is set to "1", and the address range of the cell number B = 1 is recognized in step S32. Step S3
Image memory 2 for old and new version layout
With respect to Nos. 3 and 22, data a ′ and a ₀ ′ are read out for each pixel from the address range by designating an address, and it is determined in step S34 whether the two pixel data match.

In step S35, if both pixel data do not match, red pixel data, for example, is written in the address, while if both data match, white pixel data, for example, in the address is used as the background color. Written. In step S37, it is determined whether or not the data comparison for all the pixels in the square is completed. If it is not completed, the process returns to step S33, but if the data comparison for all the pixels is completed, step S38.
Then, it is determined whether or not all the pixel data in the cell match, and if they match, in step S39, for example, black pixel data is written in all the pixels in the cell. In step S40, the value of B is incremented, and in step S41, it is determined whether or not the comparison of the pixel data for all the squares is completed,
If not finished, the process returns to step S32. However, if finished for all squares, this flow is finished.

For example, in the B = 1 grid shown in FIG.
Since all the pixel data in both memories 22 and 23 are the same, black data is written in the entire B = 1 grid in the difference data image memory 25. On the other hand, in the cells of B = 2 and B = 3, there is non-matching pixel data, and in the case of non-matching, red data, and when they match, white data as the background is stored in the difference data image memory 25. It is written to the corresponding address. As a result, the difference screen P3 ′ is displayed at the bottom of the monitor screen in the lower diagram of FIG. According to this display method, even if there is at least one mismatched pixel, the difference is shown in units of squares including the pixel, and therefore even a minute correction portion is not overlooked.

A system in which the plate inspection system shown in FIG. 6 is realized by a personal computer is shown in FIG. 14, in which 100 is a personal computer and 110 is an image scanner. A functional block diagram of the personal computer 100 is shown in FIG. FIG.
In the CPU 101 of the personal computer 100 of No. 5, the editing layout unit 101A and the plate inspection unit 101B corresponding to the editing layout device 11 and the plate inspection device 21 in FIG. 6 are incorporated, and these editing layout unit 101A and plate inspection are performed. In the portion 101B, the program stored in the floppy disk FD or CDROM shown in FIG. 14 is the floppy disk drive (FDD) 102.
Alternatively, it is generated by being installed through the CDROM drive 103. Further, the “internal memory” described with respect to the editing layout apparatus 11 of FIG. 6 and the “old version layout image memory 22” of the plate inspection apparatus 21,
The RAM 104 is responsible for the "new version layout image memory 23" and the "difference data image memory 25".

Since the plate inspection unit 101B according to the present invention is realized as function expansion software of the editing layout unit 101A, a plate inspection function can be added without impairing the original function of the editing layout unit 101A. Therefore, usability and efficiency of plate inspection work are significantly improved.

As described above, the plate inspection apparatus of the present invention is supposed to be provided in the form of being stored in a storage medium such as a floppy disk, but in addition to this, for example, FIG.
It is also possible to provide by the method shown by.

In FIG. 16, the program is the personal computer 201 of the host station 200, for example, HD.
It is stored in D, and the user who wants to use it accesses the host station using the dialing function of the personal computer 211 at home 210, and then transmits the number of the credit card he or she owns. Host station 2 that received this
00 confirms with the card company whether the credit number is valid by the card matching device 202, and if the card is valid, downloads the program and sends it to the applicant as file data together with the ID. The file usage fee will be settled later by a credit card. In this embodiment, since a manual for the plate inspection operation cannot be attached, if a "help" menu that explains the usage is provided in the program and the user displays the help content on the monitor screen or prints it out. Good.

In this plate making system, the storage capacity (R
(AM) can be greatly reduced, the processing time for plate inspection can be greatly reduced, and the "resolution reduction device" used in Fig. 1 is not necessary (specifically, it depends on the software. Since it is not implemented), an inexpensive device can be used as the personal computer. By the way, the one used in this embodiment has a RAM capacity of 24 MB and an HDD of 1 G.
The clocks of B and CPU are 100 MHz and are generally provided for personal use. The resolution of the image scanner for obtaining the image data was 600 dpi, but a commercially available one can also be used.

[0048]

As described above, the plate inspection apparatus of the present invention is used by being added to the existing DTP system, and the resolution of which the system outputs as a display video signal has been reduced. To check the data,
The memory capacity for storing the data can be reduced, and the time required for the plate inspection process can be significantly reduced. In general, the display video signal can change the display magnification by setting the resolution, and since the resolution setting is used as a means for setting the plate inspection accuracy, the content of the image data to be inspected is changed. Accordingly, the plate inspection accuracy or the processing speed can be prioritized, so that the plate inspection can be accurately performed. Further, since the plate inspection apparatus of the present invention is supplied as a floppy disk, a CDROM, or file data to be downloaded, it can be applied to a small-scale DTP system at low cost.

[Brief description of the drawings]

FIG. 1 is a block diagram of a digital plate inspection device disclosed in the publication.

FIG. 2 is a block diagram showing a modification of the broken line area in FIG.

FIG. 3 is a functional block diagram of an existing editing layout device.

FIG. 4 is a display magnification setting menu diagram in the editing layout apparatus of FIG.

FIG. 5 is a diagram showing a relationship between display magnification and resolution.

FIG. 6 is a control block diagram of a plate making system to which the plate inspection apparatus of the present invention is applied.

FIG. 7 is a resolution selection menu diagram in the plate making system of FIG.

8 is a flowchart showing the operation of plate inspection processing in the plate making system of FIG.

9 is a subroutine of the flowchart of FIG.

10 is a diagram showing a monitor screen during plate inspection performed by the plate making system of FIG.

11 is another subroutine of the flowchart of FIG.

FIG. 12 is a diagram showing operations performed in the subroutine of FIG.

13 is a diagram showing a monitor screen at the time of plate inspection performed by the subroutine of FIG.

FIG. 14 is a schematic diagram showing an actual embodiment of the plate making system of FIG.

FIG. 15 is a functional block diagram of the personal computer shown in FIG.

FIG. 16 is a diagram showing an example of providing a plate inspection device of the present invention.

[Explanation of symbols]

 11 Editing Layout Device 11a Layout Unit 11b Display Magnification Change Unit 12 Display Device 13 Input Device 14 Printer 15 Hard Disk Drive 16 RIP Development Device 17 Film Recording Device 21 Plate Inspection Device 22 Image Memory for Old Version Layout 23 Image Memory for True Version Layout 24 Difference point detection unit 25 Image memory for difference data 26 Window display unit 100 Personal computer 101 CPU 101A Editing layout unit 101B Plate inspection unit 102 Floppy disk drive 103 CDROM drive 104 RAM 110 Image scanner

Claims (10)

[Claims] 1. Plate inspection is performed in a plate making process in which material data such as photographs and characters is laid out on a display device (12) using an editing layout device (11) and then converted into bitmap image data. Device (21) for, from the display video signal output from the editing layout device (11) to the display device (12), before and after the layout of the image data is taken in, between the two image data A plate inspection device which detects a difference and displays the difference on the display device (12). 2. Plate inspection is performed in a plate making process in which material data such as photographs and characters is laid out on a display device (12) using an editing layout device (11) and then converted into bitmap image data. An image memory (22) for a previous version that captures image data before layout from a display video signal output from the editing layout device (11) to the display device (12)
And a new version layout image memory (23) for fetching image data after layout from the display video signal
And a difference data detection unit (24) for detecting a difference between the image data stored in both the memories (22, 23), and a difference data image memory (25) for storing the detected difference, A plate inspection device characterized by displaying the difference on the display device (12) so that the difference between the two images before and after the layout can be seen. 3. A difference between both image memories (22, 23) is detected for each pixel data, and when the pixel data do not match, different color data is written to the corresponding address of the difference data image memory (25). The plate inspection device according to claim 2, wherein the difference is displayed in different colors on the display device (12). 4. The image memory for the old version layout (2
2), the image memory for the new version layout (23) and the image memory for difference data (25) are divided into squares, and the difference between the two image memories (22, 23) is calculated as pixel data. When all the pixels match in one square area, the data of the first color is written in all the addresses of the corresponding squares of the difference data image memory (25).
3. The plate inspection apparatus according to claim 2, wherein when there is a mismatched pixel, the second color data is written in the corresponding address of the difference data image memory (25). 5. The plate inspection apparatus according to claim 1, wherein resolution setting means for changing the display magnification on the display device (12) is used as means for setting the plate inspection accuracy. . 6. A plate inspection device provided with a floppy disk in which a program for executing the function performed by the plate inspection device (21) according to any one of claims 1 to 5 is written. 7. A plate inspection device provided with a CDROM in which a program for executing the function performed by the plate inspection device (21) according to any one of claims 1 to 5 is written. 8. The program for executing the function performed by the plate inspection device (21) according to claim 1, is provided as file data downloaded online from a host station. Plate inspection device. 9. A plate making system in which material data such as photographs and characters is subjected to layout editing on a display device (12) using an editing layout device (11) and then converted into bitmap format image data. From the display video signal output from the layout device (11) to the display device (12), the display data before and after the layout is stored, the difference between the display data is detected, and the display device (12 ) A plate making system comprising a plate inspection device (21) for performing plate inspection based on the above-mentioned difference displayed in (4). 10. The plate making system according to claim 9, wherein the resolution setting means for changing the display magnification on the display device (21) is used as means for setting the plate inspection accuracy.