Pre-flight before printing is the meaning of pre-inspection. The English translation is the term Preflight, which means pre-inspection work before the plane takes off to ensure the flight safety of the aircraft. Preflight is used in the printing industry, it means pre-inspection work before printing. From this point of view, the pre-inspection before printing undoubtedly plays a vital role in the entire printing process. The workers engaged in printing all regard the pre-examination of the document pre-examination as their own work, but the actual situation is often unsatisfactory. The printing jobs submitted by the customer to the printer often have some errors, such as fonts, graphics and The loss of RGB images in CMYK format printing jobs, etc., have seriously affected the normal operation of printing operations, so it is particularly important to carry out pre-flying work.
Reasons and functions of pre-flying
In 1997, GATF (American Printing Technology Foundation) conducted a survey on common problems in digital files, and found that 85% of digital manuscripts provided by customers had errors. There are usually some problems in digital files: missing characters, missing images, incorrect colors, incorrect scanning mode, improper page settings, incorrect bleeding size, incorrect trapping, and low or high image resolution. Many customers admit that they are accustomed to making documents with software such as Word or PowerPoint, and printing documents on their inkjet printers. They are not familiar with, nor are they used to using professional typesetting software such as PageMaker or Quark, and do not understand how to make documents according to printing requirements. . In addition, some printing customers can easily change the printing requirements in the middle, which is also easy to cause rework of printing plate production. In this case, the error correction of typical printing jobs becomes a very time-consuming task, and both the customer and the printer have to negotiate to resolve it.
Most pre-checks can also detect problems such as insufficient resolution, lack of OPI images, color separation, and spot color processing. Therefore, in order to ensure the reliability and stability of printing, the following functions should be pre-checked: 1. Trap trap detection; 2. Trap processing, thin line trapping protection; 3. Fine line detection of small lines; 4. Confirmation of color separation , Four colors or with spot color processing; 5. Image resolution detection; 6. OPI function detection; 7. Page size detection.
Application of pre-flight processing in PDF documents and network
Generally, the earlier the pre-inspection work, the better. The pre-inspection work should be carried out before the customer sends the printing job to the printer, which is beneficial to both the customer and the printer. The customer pre-checks the printing jobs, and can find and correct possible document errors on his own equipment in time, thereby avoiding the time and effort spent on transferring documents back and forth, shortening the circulation period of the jobs, and possibly reducing the printing jobs. The production cost of the piece itself. Since the printer receives the ready-made print output file, it is possible to achieve a higher level of profit. At the same time, the work piece can be smoothly circulated in the printing process, so that the printer can reduce downtime and related maintenance time and related waste. Print more jobs in the same time.
Now, most files are converted to PDF format. Before the file is converted to PDF, it should be ensured that the content of the file output by the DTP typesetting application software is correct. After being converted into a PostScript file and then converted into a PDF file, it should generally meet the printing requirements. You can also use Adobe's Acrobat Reader to perform intuitive browsing and inspection of PDF files to check whether the files have typos, missing characters, font types, characters and image positions, and content. However, some problems are not enough to be checked by AcrobatReader 4.0. Problems such as the quality of embedded fonts or images, inaccurate image colors, inappropriate resolutions, or files that do not match Acrobat cannot be detected by screen browsing. Pre-flying is required Software check (Acrobat Reader with lower version can not solve). Through pre-flying, you can find out whether the page content data of the digital file meets the printing requirements before output.
With the development of the times today, many aspects of our industry are different from the past, and of course there are certain changes in the pre-inspection. Many aspects of the printing process have been carried out through the Internet, including RFQ (Request for Citation), related collaboration, proofreading, job registration and submission, etc. The pre-inspection process is also transferred to the Internet without exception, and it is inseparable Support for related software, such as MarkzNet by Markzware, Preflight Online by ExtensisProduct Group, Printflight application software by Printable.com, and Inproduction PreflightOnline by Adobe. In the process of automating the pre-inspection process and pipeline operation, the network pre-inspection tool software must eliminate some obstacles so that the new pre-inspection work mode can be further promoted. First of all, since MarkzNet, Preflight Online and PrintFlight have achieved seamless integration in the document submission process, users do not need to add new steps in the operation process, or even need to run another application. In fact, the designer does not need to use any preflight software to perform preflight. All they need is a web browser and a free desktop client program or a plug-in of a few hundred kilobytes.
The key to smooth flight
The pre-inspection is to ensure that all problems in the document are found before the official printing production. In this way, the document will not encounter any trouble during the RIP process, nor will it affect the final printing quality. But sometimes we do not have a thorough understanding of pre-flying. We must know that it is a quality control check conducted early in the workflow to prevent possible problems in printing production and post-press processing. The following measures will help you ensure that the pre-check is successful.
1. Indicate on your quotation: This quotation is based on an electronic file that can be exported instantly. Any corrections or modifications that must be made for successful output will be considered as extra work and charged, and confirmed by the customer.
2. Create a leaflet called "Requirement to Submit Disk", which should have the necessary information, but it should not be made too long.
3. Obtain a printed copy from the customer. If it exceeds a single color, a color-separated printed copy is required.
4. Compare the quotation with the material as soon as the material arrives to make an assessment.
5. Check whether all disks contain viruses, and do not apply the disk work, you should use the copy file work, or use "Collect for Output" or "Prepare for Service Bureau" option in Quark or PageMaker.
6. Consistent fonts and file storage are very important. Some companies store fonts on their own hard drives, while others store them on servers. The most important criterion is that all employees can access all words, and all employees should know the different file naming standards, as well as the path of the original file and the correction file. In other words, you should not need to use a specific machine to print a certain file.
7. Focus on pre-flight methods. The easiest is to use pre-check identification software, such as Markzware FlightCheck or ExtensisPreflight Pro; the second method is based on application software, that is, to use the application software that created this file to check its basic elements, such as Quark, PageMaker, Illustrator, Freehand, PhotoShop, etc .; The third pre-check method is to rasterize the original file into a file that can be viewed on a monitor or printed by software such as A dob eAcrobat. This method allows the raster-processed or PDF-format files to be compared on the display with the printed copy provided by the customer. Then the PDF file can be printed with a high-precision laser printer, and then placed on the customer's print book for the second pre-check. Finally, if the page is black and white, this PDF file can be transferred to a high-precision laser image output machine for final output. The last kind of pre-inspection is to check the problems that may occur during printing, such as trapping, bleeding, paper direction, paper grain, and to ensure that there is extra space to meet the needs of post-press processing. [next]
Examples of software that can be used for PDF pre-flying or editing
Now, many popular software on the market can be used to optimize the generated PDF, as well as manage, check and modify PDF files. The following is a brief introduction to several software that can be used for PDF pre-flying or editing.
1. Adobe's Arobat 6.0 /7.0 Professional
The core of Acrobat 6.0 Professional's pre-inspection capability is placed in Calas Software's pdfInspektor2. Together with ICC feature files, it provides PDF / X-1a and PDF / X-3 generation and inspection. At the same time, in order to pre-check more than 400 standards in PDF, the settings (rules and conditions) of the characteristic files can be predefined. Users can define new characteristic files, or modify any existing characteristic file by adding, deleting, or editing rules and conditions. They can also establish continuous batch processing, and can import or export characteristic files. During the preflight, if a document priority conflicts with the rules or conditions stated in the selected characteristic file, they are listed in the preflight results and selectively reported.
pdfInspektor2 also provides a quick glance at the detailed list of problems identified during the preflight. After the pre-check, a confirmation icon can be added to notify the prepress service staff and other users about the validity of the PDF document. The icon is embedded in the preflight feature file and the result of the preflight report, and a time icon is generated to allow the user to view the file during the preflight
Has it been changed? The improved Adobe Acrobat 7.0 Professional uses the improved preflight tool (now supports droplets for automation) to check problems in Adobe PDF files and share the preflight report as a comment.
When integrating workflow products, pdfInspektor2 can also generate reports based on the XML format. When used with AutoPilot, pdfInspektor2 Auto can be used automatically.
Automation is also the name of the processing / prepress program in Callas software. This program provides a common server-based folder system for output centers and printers to automatically monitor and pre-check received PDFs and convert them into PDF / X format.
2. Apago PDF / X Checkup 3.0
PDF / X Checkup 3.0 is a plug-in for Adobe Acrobat, used to generate, pre-check and automatically edit PDF / X-1a and PDF / X-3 files. Version 3.0 adds several new features, including PDF / X Plus workflow check, and is compatible with Acrobat 6.0 and Mac OS X.
PDF / X Checkup 3.0 includes two additional plug-ins: ImageAlter and BoxEditor.
ImageAlter allows users to modify the resolution, compress images, and change the image color of PDF files.
BoxEditor is a plug-in for quickly editing the bleeding and cutting boxes required by PDF / X. It has a library to store publication specifications at any time. When the user clicks the "FixAll" button, Checkup automatically corrects most errors to produce a correct PDF / X files, it also adds any missing tags required by the PDF / X standard. In addition, Checkup can increase or modify the output intent, either using a registered name or an ICC feature file as the standard required by PDF / X.
The Details window of Checkup lists all errors or warnings found during the pre-check and stores the complete report in a text file. PDF / XCheckup can detect TrueType fonts, JPEG images, spot colors, image resolutions, etc.
3. Creo's Synapse Prepare Pro 2.0
Synapse Prepare Pro 2.0 is a process tool for generating and pre-checking upstream PDFs (targeted for high-end users), allowing users to quickly generate PDF files and accurately match the technical specifications of specific printing environments. The specifications of these products provided by the printing press are given in the form of "instructions", and users can generate accurate PDF files from original applications such as QuarkXPress and Adobe InDesign.
The PDF can also include pre-inspection information. The printer runs the PDF file of its customer through Synapse Prepare Pro, performs pre-inspection and generates a report. These reports are called login files and list general information, errors and warnings, as well as fonts, colors, images, etc. Some errors can be corrected automatically (such as RGB to CMYK), while some errors require the user to return to the original file for modification.
4. Enfocus's Instant PDF 2.2,
StatusCheck 1.2, PitStop Professional 6.0, PitStop Server 3.0 Enfocus products have powerful upstream and downstream settings, providing instructions for all stages of PDF generation, pre-checking, editing preparation and printing, and are called certified PDF workflows (C certified PD Fworkflow). When the certified PDF meets PDF / X or other domestic and foreign standards, it will enforce the pre-check feature files that are certified. In the Enfocus certified workflow, the PDF generation process can be started with the PDF that is executed immediately. The Adobe Acrobat plug-in defines the correct settings for the target PDF in Adobe Acrobat Distiller (for example, when encountering PDF / X Plus specifications), using the Enfocus PDF generates PDFs of preflights that are executed immediately. If an error is found, the producer returns to the original file, corrects the error, and resends it to the PDF print queue. StatusCheck is a plug-in for both Adobe Reader and genuine Adobe Acrobat. StatusCheck allows anyone to check the certified PDF status of a file. It is widely used to pre-install PDF standard feature files, such as PDF / X-1a, PDF / X Plus, and PDF / X-3, as well as inherent PDF specifications, such as from PDF feature file for Ghent PDFWorkgroup members.
A more mature PDF workflow includes PitStop Professional, which delivers preflight and editing interactively. The PitStop Professional tool allows you to check and automatically or manually correct more than 100 of the most common errors in PDF files, changing text, images, line drawings, colors, and other PDF attributes. When pre-checking PDF files, Enfocus Certified PDF technology is embedded in PDF feature files and reports in pre-check files. When the user edits, he can immediately get visual feedback, can track all the editing and timing icons (timestamped), allowing version editing and rollback (rollback). Enfocus also provides a PitStop server for automatic PDF confirmation, preflighting and calibration processes. Enfocus also created CertifiedPDF.net, an online PDF specification resource. The distributor can be loaded with certified feature files and other specifications of printing customers for users to download and install to ensure that PDFs are generated according to users' printing requirements.
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