CN112214457A - Remote blue paper proofreading method and device and computer readable storage medium - Google Patents
Remote blue paper proofreading method and device and computer readable storage medium Download PDFInfo
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Abstract
The embodiment of the invention provides a remote blue paper proofreading method and device and a computer readable storage medium. The method comprises the following steps: acquiring a first image file after image processing is performed on the typeset file; acquiring a second image file which is obtained by executing raster image processing on the typeset file at the printing factory side; and automatically comparing the first image file with the second image file, and outputting a comparison result. The embodiment of the invention reduces the process link of the digital blue paper, saves the investment of related equipment and materials, saves the time and labor for printing, mailing, express delivery and reconfirming the correct and incorrect content, effectively reduces the dependence on manual proofreading, improves the production accuracy and improves the publishing and printing efficiency.
Description
Technical Field
The invention belongs to the technical field of printing, and particularly relates to a remote blue paper proofreading method and device and a computer readable storage medium.
Background
The printing industry has been in three times of 'pen and knife', 'lead and fire' and 'light and electricity', and has accelerated the pace of 'counting and networking' in this century. The third prepress process, which uses "laser photocopying" as the core technology, is gradually replaced by the fourth generation "direct plate making (CTP)" technology. From a process point of view, this is another huge revolution in the printing industry.
The third generation prepress process flow taking 'laser phototypesetting' as a technical core mainly comprises the following steps: computer typesetting → three proofs and one kernel → Raster Image Processor (RIP) processing → output film → traditional proofing → publishing agency signature confirmation, etc. The fourth generation prepress process flow using the direct-to-plate (CTP) as the core of the technology mainly includes: computer typesetting → checking and checking in three schools → outputting digital sample before RIP → editing and confirming → exporting PDF file with high resolution and transmitting to printing house → printing digital blue paper after RIP by printing house → signature and confirmation by publishing house, etc. The RIP process mainly includes interpreting various images, graphics, and characters in a computer-made layout as dot matrix information that can be recorded by a printer or a photo-setter, by a raster image processor.
Therefore, due to elimination of the film, the post-RIP becomes the largest change of the process, and the change forces the traditional proofing function to be shared by the pre-RIP digital sample and the post-RIP digital blue paper, wherein the pre-RIP digital sample ensures correct color, and the post-RIP digital blue paper ensures correct characters. However, when a PDF file is converted into a printed dot matrix image as an upgraded version of the PS page description language, various errors often occur due to differences in typesetting software, differences in system environment, differences in RIP algorithms in a printing factory CTP system, and differences in version of a word stock and a symbol stock. In the face of the errors, the errors are mainly avoided by manually correcting RIP (RIP) digital blue paper, but the work consumes a large amount of manpower and time, the effect is not satisfactory, and error missing occurs, so that the pain is troubled for many years in the industry.
Disclosure of Invention
The embodiment of the invention provides a remote blue paper proofreading method and device and a computer readable storage medium.
The technical scheme of the embodiment of the invention is as follows:
a remote blue paper proofreading method, the method comprising:
acquiring a first image file after image processing is performed on the typeset file;
acquiring a second image file which is obtained by executing raster image processing on the typeset file at the printing factory side;
and automatically comparing the first image file with the second image file, and outputting a comparison result.
In one embodiment, the typeset file is a PDF file, and the first image file after performing image processing on the typeset file includes:
and utilizing image processing software to store the PDF file as at least one of the following file formats:
bitmap file (BMP) format;
image exchange (GIF) format;
tag Image File (TIF) format;
joint Photographic Experts Group (JPEG) format;
IOS 15444 file format;
interchange file (IFF) format.
In one embodiment, the automatically comparing the first image file and the second image file comprises:
A. carrying out pixel value difference on the second image file and the first image file point by point to obtain a difference image;
B. comparing the pixel values in the difference image with a preset first threshold value, and filtering out the pixel values smaller than the first threshold value; and taking non-zero pixels which have the same color/brightness attribute and are adjacent to each other in the difference image as pixel diversity, and filtering out the pixel diversity containing the number of pixels smaller than a second threshold value.
In one embodiment, further comprising:
before the step B, whether the pixel value of the position of the nonzero pixel in the difference image corresponding to the position in the second image file exceeds a third threshold value is further judged, if yes, the pixel value of the position in the first image file is increased according to a preset percentage, and then the step A is executed again.
A remote blue paper proofing apparatus, the apparatus comprising:
the first obtaining module is used for obtaining a first image file after image processing is performed on the typeset file;
the second acquisition module is used for acquiring a second image file which is obtained by executing raster image processing on the typeset file by the printing factory side;
and the comparison module is used for automatically comparing the first image file with the second image file and outputting a comparison result.
In one embodiment, the typeset file is a PDF file;
the first acquisition module is used for storing the PDF file as at least one of the following file formats by utilizing image processing software:
BMP format;
GIF format;
the TIF format;
the JPEG format;
IOS 15444 file format;
IFF format.
In one embodiment, the comparison module is configured to perform pixel value difference between the second image file and the first image file point by point to obtain a difference image; comparing the pixel values in the difference image with a preset first threshold value, and filtering out the pixel values smaller than the first threshold value; and taking non-zero pixels which have the same color/brightness attribute and are adjacent to each other in the difference image as pixel diversity, and filtering out the pixel diversity containing the number of pixels smaller than a second threshold value.
In an embodiment, the comparison module is further configured to determine whether a pixel value of a position of a non-zero pixel in the difference image corresponding to the position in the second image file exceeds a third threshold, and if so, increase the pixel value of the position in the first image file according to a preset percentage.
A remote blue paper proofreading device comprises a processor and a memory;
the memory stores an application program executable by the processor for causing the processor to perform the remote blue paper proofreading method as described in any one of the above.
A computer readable storage medium having computer readable instructions stored therein for performing a remote blue paper proofing method as claimed in any one of the above.
As can be seen from the foregoing technical solutions, in the embodiment of the present invention, a first image file obtained by performing image processing on a typeset file is obtained; acquiring a second image file which is obtained by executing raster image processing on the typeset file at the printing factory side; and automatically comparing the first image file with the second image file, and outputting a comparison result.
Therefore, the method and the device reduce the process link of the digital blue paper, save the investment of related equipment and materials, save the time and labor for printing, mailing, express delivery and reconfirming the correct and incorrect content, effectively reduce the dependence on manual proofreading, improve the production accuracy and improve the publishing and printing efficiency.
In addition, in the embodiment of the invention, the difference areas with dim brightness and small area are filtered out through the brightness threshold value filtering and the aggregation quantity threshold value, and the remaining difference areas are error areas which really need to be corrected, so that the embodiment of the invention also obviously improves the working efficiency of printing proofreading.
Drawings
Fig. 1 is a flowchart of a remote blue paper proofreading method according to an embodiment of the invention.
Fig. 2 is a schematic diagram of remote blue paper proofreading according to an embodiment of the invention.
Fig. 3 is a structural diagram of a remote blue paper proofreading apparatus according to an embodiment of the present invention.
Fig. 4 is a block diagram of a remote blue paper proofreading apparatus having a memory-processor architecture according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the accompanying drawings.
For simplicity and clarity of description, the invention will be described below by describing several representative embodiments. Numerous details of the embodiments are set forth to provide an understanding of the principles of the invention. It will be apparent, however, that the invention may be practiced without these specific details. Some embodiments are not described in detail, but rather are merely provided as frameworks, in order to avoid unnecessarily obscuring aspects of the invention. Hereinafter, "including" means "including but not limited to", "according to … …" means "at least according to … …, but not limited to … … only". In view of the language convention of chinese, the following description, when it does not specifically state the number of a component, means that the component may be one or more, or may be understood as at least one.
In the embodiment of the invention, the existing prepress process flow is modified, so that the primary imaging conversion of the typeset file (usually a PDF data file) is changed into the secondary imaging conversion, and the converted paper draft is manually corrected into the electronic image file. And comparing the dot matrix file after RIP at the printing factory side with the dot matrix file generated by the imaging processing at the publishing company side remotely through a remote image screening algorithm and an internet technology, and outputting a comparison result so as to guide printing production.
Fig. 1 is a flowchart of a remote blue paper proofreading method according to an embodiment of the invention. The method is suitable for the prepress process flow, and by improving the fourth generation prepress process flow, the time and labor for printing blue paper, mailing, express delivery and reconfirming the correct and incorrect content can be saved, the dependence on manual proofreading is effectively reduced, the production accuracy is improved, and the publishing and printing efficiency is improved.
As shown in fig. 1, the method includes:
step 101: and acquiring a first image file after image processing is performed on the typeset file.
Here, the post-layout file is a PDF file, and the first image file after performing image processing on the post-layout file includes: and utilizing image processing software to store the PDF file as at least one of the following file formats: bitmap file (BMP) format; image exchange (GIF) format; tag Image File (TIF) format; joint Photographic Experts Group (JPEG) format; IOS 15444 file format; interchange file (IFF) format, and the like.
Preferably, the image processing software may be implemented as PhotoShop software.
The above exemplary description has been given of a typical example of image processing software and a first image file, and those skilled in the art will appreciate that this description is merely exemplary and is not intended to limit the scope of embodiments of the present invention.
Step 102: and acquiring a second image file obtained by executing RIP processing on the typeset file by the printing factory side.
Here, the RIP process generally includes two parts: an explanation section and a control section. The interpretation part receives the page information from the computer and encodes it for use by the control part; the control part is used for controlling the operation of the imaging system. The interpretation part firstly translates the instruction of the page description language into a display list, all the calculation objects in the page are buffered and stored according to a uniform format, and then the objects of the display list are converted through a reduction module according to the special resolution of the output equipment. For example, smooth text edges are formed with step-shaped transitions. The resulting contone image is then segmented into dots by a rasterization module and converted to the original data format (typically a bitmap format) of the output device.
Among them, RIP processing is generally divided into hardware RIP and software RIP, and there is also RIP with combination of hardware and software. The hardware RIP is actually a special purpose computer, which is dedicated to interpreting the information of the page. Since the computational load of page interpretation and screening is very large, hardware RIP has been generally employed in the past to increase the operation speed. The software RIP is a method for calculating a page by software and transmitting the interpreted record information to the photocopier through a specific interface card, and thus the software RIP is installed on one computer. The computing speed of computers has been improved obviously, and the interpretation algorithm and the screening algorithm of RIP have been improved continuously, so the interpretation speed of software RIP is no longer behind or even exceeds that of hardware RIP. The software RIP is easy to upgrade and can be improved along with the improvement of the operation speed of a computer.
Step 103: and automatically comparing the first image file with the second image file, and outputting a comparison result.
In this case, the second image file is compared with the first image file point by point (pixel), and a difference image can be determined, in which an error in the interpretation process is inevitably reflected. Then, the difference image is outputted to the printing house side or the publisher side as a comparison result, so that the printing house side or the publisher side can easily know the comparison result. When the publisher side determines that the print job is expected based on the comparison result, the printer side may be instructed to execute the print job.
The applicant has also found that: because the original PDF file is interpreted into a dot matrix pattern by different vector graphics and text interpreters, the final image is only highly approximate due to the differences between the interpretation algorithm and the font library, and there are many differences from the viewpoint of pixels (dots), so that a large number of comparison difference results may occur, and it is still necessary to screen out the actually wrong place from these difference results. By analyzing the characteristics of the difference images of the original document and the printed numerical value document, the applicant finds that most of the difference areas have the characteristics of dim brightness and small area compared with the real errors in printing. Therefore, it is preferable that the difference regions due to the difference in interpretation algorithms can be screened and filtered through a certain process based on the characteristics of the difference image while the real printing error is maintained.
In one embodiment, automatically comparing the first image file and the second image file comprises: A. carrying out pixel value difference on the second image file and the first image file point by point to obtain a difference image; B. comparing the pixel values in the difference image with a preset first threshold value, and filtering out the pixel values smaller than the first threshold value; and taking non-zero pixels which have the same color/brightness attribute and are adjacent to each other in the difference image as pixel diversity, and filtering out the pixel diversity containing the number of pixels smaller than a second threshold value.
Preferably, the method further comprises the following steps: before the step B, whether the pixel value of the position of the nonzero pixel in the difference image corresponding to the position in the second image file exceeds a third threshold value is further judged, if yes, the pixel value of the position in the first image file is increased according to a preset percentage, and then the step A is executed again.
Therefore, the embodiment of the invention also provides a method for screening the obvious difference from the similar images, and the working efficiency of printing proofreading can be obviously improved. The method comprises the following steps:
(1) carrying out pixel value difference calculation on the second image file and the first image file point by point to obtain a difference image;
(2) and brightness filtering: and comparing the pixel value in the difference image with a preset first threshold (brightness threshold), filtering out the pixel value smaller than the first threshold, and obtaining the difference image after brightness filtration.
Pixel values less than the first threshold are considered noise, and filtering pixel values less than the first threshold means significantly increasing the contrast between pixel points less than the first threshold and pixel points greater than the first threshold to distinguish the noise from the true difference sought. For example, the values of the pixel points smaller than the first threshold are set to be the same as the background. For example, with RGB pixels, the background pixel value is (0,0,0), and these pixels are all set to (0,0, 0). In some embodiments, the background pixel value may take other values as well.
The first threshold may be manually selected according to experience, or according to another embodiment of the present application, a lower limit of a value range of the first threshold is 0, and an upper limit thereof is one of the following:
(a) the average value of the brightness of the non-zero pixels in the difference image;
(b) the mean value of the brightness of the non-zero pixels in the difference image and the mean value of the lowest brightness value of the non-zero pixels in the difference image;
(c) and the mean value of the brightness of the non-zero pixels in the difference image and the mean value of the highest value of the brightness of the non-zero pixels in the difference image.
(3) And filtering the aggregation quantity: and taking pixels which have the same color/brightness attribute and are adjacent to each other in the difference image as pixel diversity, filtering out the pixel diversity with the number of pixels smaller than a second threshold (aggregation number threshold), and obtaining the difference image after aggregation number filtering.
According to another embodiment of the present application, a value range of the second threshold is: m is multiplied by N, wherein the value range of M is 2,3 and 4; the value range of N is 2,3 and 4. For example, the second threshold may be: 2 × 2, 2 × 3,3 × 2,3 × 3,4 × 4, etc.
According to a further embodiment of the application, the pixel values are RGB pixel values or CMYK pixel values.
During the processing of the printed text and images in the interpreter, filling transitional colors are adopted at the edges in order to ensure smooth edge contour and avoid jaggies. The area filled with the transition color is different from the original image, and therefore inevitably appears in the difference image. In order to enhance the screening effect and ensure that the region filled with the transition color is filtered, another embodiment of the present application can enhance the brightness value of a certain value aiming at the part filled with the transition color in the background of the contrast image, so that the brightness value meets the threshold screening standard.
Preferably, step (3) may further include a background enhancement step: and judging whether the pixel value of the position of the nonzero pixel in the difference image corresponding to the position in the second image file exceeds a third threshold value or not, if so, increasing the pixel value of the position in the first image file according to a preset percentage. And then, the step (1) is executed again to obtain the difference image again, and the subsequent filtering step is executed on the obtained difference image again.
The third threshold may be taken to be some value close to pure white (RGB pixels pure white is (255,255,255)), for example (250,250,250), and the percentage may be 30%.
In another embodiment of the present application, the order of the luminance filtering of step (2) and the aggregation number filtering of step (3) may be interchanged. In other embodiments, after obtaining the difference image, only brightness filtering or only aggregate number filtering may be performed.
Fig. 2 is a schematic diagram of remote blue paper proofreading according to an embodiment of the invention.
In fig. 2, the remote blue paper system includes a manuscript sampling file storage on the network side, a remote comparison module on the network side, and a blue paper file storage on the network side. The manuscript setting sample storage stores a first image file (manuscript setting sample image file) which is edited and checked by a publishing company and obtained by performing imaging processing on a PDF data file. The blue paper file memory stores a second image file (blue paper image file) analyzed by a RIP system in CTP equipment of a printing factory from a PDF data file. The remote comparison module comprises an image screening algorithm, pixel-level comparison and screening are carried out on the manuscript setting clear sample files on two sides of the network and the corresponding blue paper files, and comparison differences are output.
Preferably, the remote alignment module can be deployed at any location, such as: cloud, or publisher side, or print shop side, etc.
The file memory of the draft sample file, store the image file that the identical PDF data file produces through the imaging process, and the image file, is examined and passed by the publishing agency, confirm that accords with the publishing requirement. The blue paper file memory stores image files generated by the same PDF data file through a printing factory CTP system RIP. Preferably, an image screening algorithm built in the remote comparison module makes a difference value between the manuscript setting clear sample image file and the corresponding blue paper image file; filtering the specified color value; and filtering the size of the pattern and the like to obtain the difference between the two image files. The remote comparison module can also send an alarm message for prompting the difference to the printing factory side and send an alarm message for prompting the difference to the network side.
Based on the above description, the embodiment of the invention also provides a remote blue paper proofreading device.
Fig. 3 is a structural diagram of a remote blue paper proofreading apparatus according to an embodiment of the present invention.
As shown in fig. 3, the remote blue paper proofreading apparatus includes:
a first obtaining module 301, configured to obtain a first image file obtained by performing image processing on the typeset file;
a second obtaining module 302, configured to obtain a second image file obtained by performing raster image processing on the typeset file by the printing factory side;
and the comparison module 303 is configured to automatically compare the first image file with the second image file, and output a comparison result.
In one embodiment, the typeset file is a PDF file; a first obtaining module 301, configured to utilize image processing software to store the PDF file as at least one of the following file formats: BMP format; GIF format; the TIF format; the JPEG format; IOS 15444 file format; IFF format, etc.
In one embodiment, the comparison module is configured to perform pixel value difference between the second image file and the first image file point by point to obtain a difference image; comparing the pixel values in the difference image with a preset first threshold value, and filtering out the pixel values smaller than the first threshold value; and taking non-zero pixels which have the same color/brightness attribute and are adjacent to each other in the difference image as pixel diversity, and filtering out the pixel diversity containing the number of pixels smaller than a second threshold value.
In an embodiment, the comparison module is further configured to determine whether a pixel value of a position of a non-zero pixel in the difference image corresponding to the position in the second image file exceeds a third threshold, and if so, increase the pixel value of the position in the first image file according to a preset percentage.
Fig. 4 is a block diagram of a remote blue paper proofreading apparatus having a memory-processor architecture according to an embodiment of the present invention.
As shown in fig. 4, the remote blue paper proofreading apparatus having a memory-processor architecture includes: a processor 401 and a memory 402; in which a memory 402 has stored therein an application executable by the processor 401 for causing the processor 401 to perform a remote blue paper proofing method as described in any of the above.
The memory 402 may be embodied as various storage media such as an Electrically Erasable Programmable Read Only Memory (EEPROM), a Flash memory (Flash memory), and a Programmable Read Only Memory (PROM). Processor 401 may be implemented to include one or more central processors or one or more field programmable gate arrays that integrate one or more central processor cores. In particular, the central processor or central processor core may be implemented as a CPU or MCU.
It should be noted that not all steps and modules in the above flows and structures are necessary, and some steps or modules may be omitted according to actual needs. The execution order of the steps is not fixed and can be adjusted as required. The division of each module is only for convenience of describing adopted functional division, and in actual implementation, one module may be divided into multiple modules, and the functions of multiple modules may also be implemented by the same module, and these modules may be located in the same device or in different devices.
The hardware modules in the various embodiments may be implemented mechanically or electronically. For example, a hardware module may include a specially designed permanent circuit or logic device (e.g., a special purpose processor such as an FPGA or ASIC) for performing specific operations. A hardware module may also include programmable logic devices or circuits (e.g., including a general-purpose processor or other programmable processor) that are temporarily configured by software to perform certain operations. The implementation of the hardware module in a mechanical manner, or in a dedicated permanent circuit, or in a temporarily configured circuit (e.g., configured by software), may be determined based on cost and time considerations.
The present invention also provides a machine-readable storage medium storing instructions for causing a machine to perform a method as described herein. Specifically, a system or an apparatus equipped with a storage medium on which a software program code that realizes the functions of any of the embodiments described above is stored may be provided, and a computer (or a CPU or MPU) of the system or the apparatus is caused to read out and execute the program code stored in the storage medium. Further, part or all of the actual operations may be performed by an operating system or the like operating on the computer by instructions based on the program code. The functions of any of the above-described embodiments may also be implemented by writing the program code read out from the storage medium to a memory provided in an expansion board inserted into the computer or to a memory provided in an expansion unit connected to the computer, and then causing a CPU or the like mounted on the expansion board or the expansion unit to perform part or all of the actual operations based on the instructions of the program code.
Examples of the storage medium for supplying the program code include floppy disks, hard disks, magneto-optical disks, optical disks (e.g., CD-ROMs, CD-R, CD-RWs, DVD-ROMs, DVD-RAMs, DVD-RWs, DVD + RWs), magnetic tapes, nonvolatile memory cards, and ROMs. Alternatively, the program code may be downloaded from a server computer or the cloud by a communication network.
"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative. For the sake of simplicity, the drawings are only schematic representations of the parts relevant to the invention, and do not represent the actual structure of the product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "a" does not mean that the number of the relevant portions of the present invention is limited to "only one", and "a" does not mean that the number of the relevant portions of the present invention "more than one" is excluded. In this document, "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used only to indicate relative positional relationships between relevant portions, and do not limit absolute positions of the relevant portions.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A remote blue paper proofreading method is characterized by comprising the following steps:
acquiring a first image file after image processing is performed on the typeset file;
acquiring a second image file which is obtained by executing raster image processing on the typeset file at the printing factory side;
and automatically comparing the first image file with the second image file, and outputting a comparison result.
2. The remote blue paper proofreading method according to claim 1, wherein the laid-out file is a PDF file, and the performing the image processing on the first image file of the laid-out file comprises:
and utilizing image processing software to store the PDF file as at least one of the following file formats:
BMP format of bitmap file;
image exchange GIF format;
TIF format of label image file;
JPEG format for joint photographic experts group;
IOS 15444 file format;
the file IFF format is interchanged.
3. The remote blue paper proofreading method according to claim 1,
the automatically comparing the first image file and the second image file comprises:
A. carrying out pixel value difference on the second image file and the first image file point by point to obtain a difference image;
B. comparing the pixel values in the difference image with a preset first threshold value, and filtering out the pixel values smaller than the first threshold value; and taking non-zero pixels which have the same color/brightness attribute and are adjacent to each other in the difference image as pixel diversity, and filtering out the pixel diversity containing the number of pixels smaller than a second threshold value.
4. The remote blue paper proofreading method according to claim 3, further comprising:
before the step B, whether the pixel value of the position of the nonzero pixel in the difference image corresponding to the position in the second image file exceeds a third threshold value is further judged, if yes, the pixel value of the position in the first image file is increased according to a preset percentage, and then the step A is executed again.
5. A remote blue paper proofreading apparatus, comprising:
the first obtaining module is used for obtaining a first image file after image processing is performed on the typeset file;
the second acquisition module is used for acquiring a second image file which is obtained by executing raster image processing on the typeset file by the printing factory side;
and the comparison module is used for automatically comparing the first image file with the second image file and outputting a comparison result.
6. The remote blue paper proofreading apparatus according to claim 5, wherein the typeset file is a PDF file;
the first acquisition module is used for storing the PDF file as at least one of the following file formats by utilizing image processing software:
BMP format of bitmap file;
image exchange GIF format;
TIF format of label image file;
JPEG format for joint photographic experts group;
IOS 15444 file format;
the file IFF format is interchanged.
7. The remote blue paper proofreading apparatus according to claim 6,
the comparison module is used for carrying out pixel value difference calculation on the second image file and the first image file point by point to obtain a difference image; comparing the pixel values in the difference image with a preset first threshold value, and filtering out the pixel values smaller than the first threshold value; and taking non-zero pixels which have the same color/brightness attribute and are adjacent to each other in the difference image as pixel diversity, and filtering out the pixel diversity containing the number of pixels smaller than a second threshold value.
8. The remote blue paper proofreading apparatus according to claim 7,
and the comparison module is further used for judging whether the pixel value of the position of the nonzero pixel in the difference image corresponding to the position in the second image file exceeds a third threshold value or not, and if so, increasing the pixel value of the position in the first image file according to a preset percentage.
9. A remote blue paper proofreading device is characterized by comprising a processor and a memory;
the memory has stored therein an application executable by the processor for causing the processor to perform the remote blue paper proofing method of any one of claims 1 to 4.
10. A computer-readable storage medium having computer-readable instructions stored thereon for performing the remote blue paper proofreading method of any one of claims 1 to 4.
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