The PDF was originally available as an optional file format in a co-printer ad delivery program. This program supports the digitized transmission of more than 1600 daily, weekly and monthly reports. And it is not only used in black and white advertising, but also used as a color advertisement. Because PDF's advertisements have a small file size, it is used today as an ideal file transfer format that includes many telecommunications departments. PDF ensures that digital advertising can be delivered at high speed and consistency anywhere in the world. But since PDF files can be applied to global newspaper advertisement transmission, why can't it be used more widely in other publications? To understand the reasons for this, we need to know what the value of PDF is and what barriers exist in the widespread use of PDF.
PDF has high application value in many fields because PDF has many characteristics. This includes device independence (PDF is independent of the platform used) and page independence. In addition, PDF comes with a cross-platform support for free-to-use readers. Device page independence is a key factor. With the increasing degree of automation, it is required to display and output the same file on different devices in different environments.
Although Postscript has become a recognized format for many output centers, this format requires the installation of appropriate software for each device. Postscript neither supports page independence, nor can it preview or select a single page in the final document.
The complete PDF file includes all font information and image information. In addition, if you have a good color management protocol, you can see the same files on different platforms such as Macintosh, Windows, and Unix. This makes PDF an ideal format for soft proofing on content and even on color.
Although some applications like Adobe PageMaker, Illustrator, and Photoshop allow users to save or export to a PDF file format, this is not a native application file that one would imagine. Until now there is no application that allows full operation of PDF files. Adobe InDesign, the recently released design and page application software, claims that native PDF page program files can be used directly for printing.
The Adobe Distiller application converts Postscript to a PDF file format. It is the best way to create a PDF file for printing. The problem, however, is which applications must be installed on the machine before Distiller creates a PDF file. Can you use Dsitiller to create a PDF file directly. Of course, this depends on where you are in the publishing process. If you are a designer, it may be a good idea to use PDF as an Adobe design package, including fixed formats for InDesign, Illustrator, and PhotoShop. PDF allows seamless design, authoring, and editing; however, these PDF-based methods will be incorporated into the Quark production workflow. If you are an exporter of a prepress service center, you may be happy to accept PDFs in Quark or other application files created in Distiller.
Another important feature of the new PDF version 1.3 is that it improves the ability to edit files. Although PDF has the ability to edit files long ago, the tools required are still not readily available. Like PDF1.3, the recently released Adobe Acrobat 4.0 has a large market share. Its ability to edit documents includes the control of text, as well as the control of PhotoShop scans (raster diagrams) and Illustrator illustrations (vector diagrams). This editing capability extends the potential of PDF as a transport format and even as a product format.
As a file transfer format, PDF can create and send documents to the printing department or other related departments where the content is provided. Of course, the nature of this file format is far from satisfying the requirements of the file recipient. There are still many file formats that are still waiting for the updated version when the publishing and printing departments accept these application files.
Thanks to Adobe Acrobat software, prepress systems and output devices support the printing of PDF files. Printing support for PDF files is done through Adobe Acrobat. In effect, this creates a Postscript file that can be accepted for these systems and devices. However, with the release of Postscript3 RIP, PDF files can be used directly without having to convert to Postscript or Acrobat.
Almost all output devices are now equipped with Adobe Postscript3 RIP or other accessories. They support PDF files as input file formats and implement different types depending on the process. It will affect many prepress tasks such as trapping and registering. Currently, the trapping and registration of local PDF files is limited to a new prepress workflow and some third-party applications. However, with the release of a new version of trap trapping software, this situation will improve.
Another application of PDF is as an internal operation format. The internal transfer format is the file format in the prepress output system. This format supports trapping, registering, and editing during output.
As an internal transmission format, Agfa was the first to successfully apply PDF to its Apogee product. But Fuji, Valiano Systems and Heidelberg Prepress Systems are discussing its new prepress workflow system, which will use PDF as a transport format.
Scritex, Barco, Rampage, Screen, and other systems have implemented PDF seamless integration within their workflow. PDF files are converted to internal operating formats. Finally, once the customer requests a smooth, accurate page, there may not be a major problem.
Due to the limited application of special prepress software packages supporting local PDF, Oriental Rainbow has adopted Agfa's Apogee system. However, its development and application are not yet perfect, and its working efficiency is still slow.
Today, about 15% of the work in computer-to-plate (CTP) is passed to the printer in PDF format. The first transmission of CTP work in PDF was in July 1998, and it was confirmed that one-third of print clients accepted PDF files. This broke the monopoly of TIFF/IT and film output in the past.
In the pre-separation workflow, image files are usually saved in the DCS multi-document format. The advantage of this is that each color of CMYK exists as four separate file channels. Once it is put into Quark or other page layout software, each color file can be printed separately from the application. In other words, the application creates a separate Postscript page for each color and page of the image file, and assigns the color separation image file to the corresponding page.
During the typesetting process, the stored image files are not divided into individual files or pages and are saved as a single file. It contains all image color data. When you put a file into a page application and print it out, you print a composite Postscript file (all color information is contained in a file or page). The file was separated by RIP. Usually this will ensure that the workflow is simpler and more reliable, and it will be more able to embody WYSIWYG. You print out the synthesized file while synthesizing the file on the display.
If you want to use the pre-separation image format in the layout process, you will need to synthesize the image in PhotoShop or software that creates the Postscript file and separates the image synthesis functions. In addition, some pre-separation workflow systems have special provisions to deal with this issue. So if the file format is a pre-separated image file, then you have to do a lot of work to convert it to a typesetting workflow.
Another important issue with PDF is the normality of file output. It contains documents for the "non-professional" publishing market. In many cases, PDF creation creates a format that can be used across different RIPs and output devices.
Obviously, PDF will bring great benefits to the entire output from the design to the page production in the publishing process. The continuous improvement and development of Acrobat and PDF files will bring great convenience to printing and networking. In addition, Acrobat plug-ins and applications provided by third parties will further support and extend its capabilities, making PDF workflows more widely available.
Now, the biggest obstacle in the use of PDF workflow promotion will be cultural factors. Despite the tools needed to implement the process, it will take some time for people to handle these new output processes. Those who are reluctant to adopt new technologies have yet to change their thinking from the traditional production process to the digital production process.
With the widespread use of PDF, the entire prepress process will also change. Although in today's production process, there is still a need for a dedicated prepress plant to handle the OPI trap. However, this situation will change in the near future.
The use of PDF also makes the compression technology practical. Small files not only make it easier to transfer the final file output process, but also greatly reduce the production process of the output device. Of course, the successful completion of this task lies in the proficiency of the staff.
PDF is changing the entire printing process. Although there are still obstacles in popularizing applications, its advantages in the entire publishing process have become increasingly prominent and have excellent application prospects. It is believed that in the near future, PDF will be more widely used as a universal file format.
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