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Adobe's Portable Document Format (PDF) solves many problems for the publishing industry. In particular, prepress companies are taking advantage of this standard data format and use it as much as possible. Unlike other digitized file formats, it does not need to separate text files, fonts, image files or vector diagrams. Acrobat Distiller will merge all of them into this file when generating the PDF. Since it has nothing to do with the operating system and media, PDF can be used as a "virtual work package" that can add all the pre-press content needed. As a goal-oriented format, PDF is independent of resolution. According to needs, it can be used for high-end output such as plate output or film output, and it can also use data compression Down sampling for Internet or CD-ROM.
Adobe developed PDF as a data format for a paperless office, but people soon discovered its use in the prepress environment. For example, PDF data compression has great advantages. It reduces the number of Postscript data that was originally on a single page to a few hundred megabytes. For example, SuDwest-Rolle Printing Co. in Stuttgart, Germany, produces samples. The company reduced the 1.8GB data per sheet to 140MB. This is important not only for archiving but also for editing and delivering data on the web.
Choosing a Product Of course, like every new technology, PDF has its own shortcomings. Including some technical defects, (we look forward to) Adobe will solve these problems in later versions. Although non-technical issues are often more difficult, many users have become familiar with the specificities of file processing and other formats. At the beginning of the acceptance of the PDF workflow, various production problems will inevitably arise.
Due to the potential of PDF, printing equipment and software developers have introduced its advantages into their workflow. Agfa first entered the market with Apogee, while CreoScitex and Heidelberg used PDF as the basis of Prinergy. An important feature of these workflows is that all production steps start from the same single user interface to the next step without too much interference from the operator. System manufacturers use integrated workflows to solve these problems. For example, the composition of a complete Agfa Apogee workflow system: Apogee Creat (Agfa Normalizer for PDF generation), Apogee Pilot Workflow Central Control Panel), Apogee PDF-RIP (Interpretation and Output File), Apogee Prindrive (Output Management) and Apogee InkDrive (tool for generating CIP4 data for automated presses and bindings). Agfa sells the entire workflow module for $50,000, including five Normalizer licenses, but does not include hardware. Prinergy is also a modular system. It includes Normalizer (Adobe Distiller's OEM product) high resolution and low resolution Render, Archive module Trapping Engine and proofer driver module. Other Prinergy components include color management software, Printlink (a module that generates CIP4 data), and at least five licenses for workflow systems. In the background there is a central database that monitors the entire process. The basic system does not include hardware and costs about $56,000. The advantages of this system for users are obvious. It has a single user interface with all components using a single system design, all of which are constantly being improved by a single vendor. In general, incompatibilities between modules are avoided. After accepting vendor training, users can obtain consistent output. All production steps - from generating PDF files, preflighting, editing and modification of PDF files, color adjustment, to overprinting control and color separation, are all controlled within the integrated system; operator errors are minimized. Providing these security features gives manufacturers a lot of revenue. There are many license fees (including upgrade fees, additional hardware fees, service contracts, etc.). This makes using high-end workflows a costly process. Perhaps worse, these "hidden" costs make it difficult to estimate a budget like the Prinergy or Apogee system.
Therefore, many users decide not to purchase a complete system, but use different products to combine themselves into a working system. Obviously, this approach has the advantage of low start-up costs, but it is costly to acquire expertise and staff training. They must learn each tool and understand the entire workflow. In addition, they must formulate and strengthen agreements involving the various software parameters used, work procedures, and file names. However, if it is well-designed, it may be flexible and cost-effective.
Just like high-end systems, you can also decompose your own PDF workflow into several steps. This includes generating PDF files, preflighting, modifying files, editing and color conversion, recombination, overprinting controls, color separations, and output. This article will analyze some of the professional tools used at each step.
Generate PDF files
The basic software for generating PDF files is Adobe's Acrobat Distiller, which is the core of the $249 Acrobat product. It also contains software for viewing PDF files, abbreviated Acrobat. Distiller is a Postscript interpreter that converts Postscript data to PDF. The user is required to select different tasks to achieve image compression, text inclusion, and other prepress-related settings.
PDF workflow
Describes a typical PDF workflow, including the products used in various stages.
In the two complete workflows mentioned above, as a PDF generator, Adobe Normalizer plays the same role as Distiller. In most respects, Normalizer has the same functionality as Distiller, but it has different user interfaces and other OEM features. Agfa offers a separately available version of the Normalizer Apogee Creat for $895. It can be used without other Apogee workflows, it has a set of useful additional features, such as job ticket control and built-in preflight tools. However, users must determine if the advantages of using Normalizer are more than disadvantages. For example, Apogee Creat 1.0 generates PDF files with unnecessary image data. Use Acrobat Distiller to convert a 42MB Postscript data file into a PDF file and generate a 1.2MB PDF file, while Apogee Creat 1.0 generates a 1.3MB PDF file. In addition, Normalizer Extreme PDF users can trust that they are consistent with Adobe's parameters and output on most Adobe Rip-based devices.
For pre-press customers Apogee Creat, who have special requirements, use folder-controlled PDF generation. Each input can use pre-determined operating parameters and job tables to check and correct general errors.
There are some products that can generate PDF files, but in general should avoid using these products. The most common Adobe PDF Witer does not apply to prepress. It is designed for office applications and can convert files made with Macintosh QuickDraw or Windows GDI to PDF files. PDF Witer does not utilize Postscript and therefore cannot generate the PDF quality and features required by the printing industry. For example, the EPS image will be processed at the resolution of the screen, creating a "step" edge rather than a professional image. Similarly, Pint ToPDF ($20) or Win2 PDF ($35) for the Mac operating system cannot replace Distiller.
Only software that includes the Postscript interpreter can reliably translate Postscript into PDFs, such as Ghost scripts, free software packages for Mac, Windows or Unix, and Jaws PDF ($99). Ghostscript uses a bus control interface and is therefore inappropriate for normal users. Since they use non-Adobe interpreters, neither the Ghost script nor the Jaws PDF Creator can guarantee compliance with the current PDF parameters, which is detrimental to the user. For example, Jaws PDF Creator does not support embedded ICC models, bicubic image sampling, or output PDF 1.3 files. Therefore, in order to generate high-end PDFs, the preferred product is usually Adobe Distiller or a compatible Normalizer.
Pre-check
People working in high-end environments must care about whether the parameters in the PDF file are correct. By visually checking the consistency of parameters and files, you can see the imposition content. However, to check for the most important content, such as embedded text or image quality, preflight tools are needed. PDF JInspektor can detect all kinds of common pre-press hazards.
Well-known preflight tools include Adobe's versatile InProduction 10.1 ($699, excluding Acrobat) and Enfocus Software's PitStop Professional 4.6. Both of these tools are Acrobat plug-ins that perform eye inspections. Both can analyze files based on pre-set parameters and provide reports after completing the analysis. Users of Apogee Creat can use some of PitStop Preflight software's features that have been added to Agfa's PDF creation software. PitStop Professional provides a fault report as a PDF file, directly linked to the location of the file in the PDF file to which it belongs. InProduction simply provides a plain report in PDF format that explains all errors in detail. Although Adobe's tools suggest general guidance on how to solve problems and repair data, these suggestions are not helpful. Both of these softwares guide the user from one error to another. Each software presets a set of parameters according to some applications. The user can supplement them or reset according to their own conditions.
Callas Software of Germany incorporated PDfInspektor into the company's PDF Toolbox (US$299). PDF Inspektor can also find errors directly in Acrobat; it shows errors in another window. Like PitStop, it can provide reports in PDF format. The report can be sent to the user who provided the document with the error as the basis for the discussion amendment.
Some independent programs like Flightcheck and Preflight Pro can also be used for preflighting. However, the excessive choices of these two kinds of software make some users feel bad to set the pre-check parameters. In some applications, users find that both of these software have encountered some problems when diagnosing high-end PDF files.
There have recently been online preflights provided by servers, such as Preflight Online of Extensis/Creatuvepro. However, the online preflight support provided by Adobe and Extensis looks more like a presentation than a utility. The software allows users to send PDF files to a web server running a preflight program and reply to the inspection results. This makes sense for small PDF files, which are best handled locally for large PDF files (eg for CTP files). One of the most useful features of PitStop is the ability to globally find and replace PDF files. In this case, all damaged or lost words will be replaced by more suitable words. This change can be stored in the Action List, PotStop Professional can be provided again, or it can be provided by the Porstop server.
Combine PDF workflows yourself
It is not enough to realize the digitalization of the printing process relying solely on digital devices. In fact, the digital workflow is the key. However, it is difficult to establish a digital workflow. This article provides a comprehensive introduction to the digital workflow with PDF as the core.