PDF shock prepress field
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We know that Postscript is a page description language developed by Adobe. It is an interface language that desktop systems output to photo-scheduled devices. Its biggest feature is the ability to comprehensively process text and images. In a page of prints, it may contain various elements such as text, line drawings, images, etc. Postscript uses a computer data to represent and describe these elements. RIP (raster image processor) then quickly interprets the file described in the page description language as a dot matrix command that can control the output of the laser recorder, and then sends the lattice data to the recorder, controlling it like a switch. The "yes" and "none" of the laser spot are output to the film or CTP plate.
PDF (Portable Document Format) was also developed by Adobe Inc., which has become the open standard for current global electronic documents, and has made our original method of data processing unrecognizable in the prepress field. PDF brought a profound revolution to the prepress field.
A PDF document can contain all the elements used in the printing field: it can have text, graphics, images, etc.; it can also be a page with a combination of images and texts; it can even add audio and video to the page of graphic and text. information. These feature documents can exist absolutely independent of the original production and processing software, and the PDF can retain all the information in the characters, fonts, layouts and colors contained in the original feature document.
The outstanding thing about PDF documents is that it is easy to edit and modify the files. Even if you want to modify the large version made up of multiple single pages (such as A4 format), it is not difficult; even for a few single pages in the big version. It’s also a matter of doing things. Therefore, PDF will be an ideal document format for layout. PDF is a kind of information stored in digital form, which can optimize the compression of text and images. Based on its capabilities, PDF will be seen as a versatile file format in the printing industry. It will be widely used in print, online and electronic media.
PDF support software is now more and more, but most of the support is still in its infancy. Many software manufacturers have realized the flexibility of PDF and the security of data processing. As for when PDF can be widely supported as a standard format like EPS or TIF, I think it is only a matter of time. Currently PDF is output in a data stream format on the imagesetter or plate output machine. PDF documents can be converted to EPS format by Acrobat and finally at PS level1. Interpret on the RIP and then output on the imagesetter or plate output if the user is using PS level3. For RIP, the PDF document can be interpreted directly on the RIP and output on the imagesetter or plate output machine, as the PS file assumes a PDF format and an EPS format conversion. Another level3. RIP has the ability to separate PDF documents and convert them into a suitable gamut space, but the first and second generation RIPs do not. For users who are accustomed to using or only having first- and second-generation RIPs, Acrobat software provides an extension software called "plug in." By using "plug in", with the help of the software "PDF output pro", we can have a company's PDF files processed on a local computer and then pass PS level1. The interpretation of RIP ended up with no difficulty in output.
Currently, in order to make PDF documents optimally utilized in the prepress field, it is implemented by Jobtickets in Adobe's new product PDF Catalog 1.3, which is usually in a standard data format (Protable Job Ticket). Format (PJTF)) to indicate. By applying Jobtickets, PDF files can contain some control commands for the output device as well as the post-processing device. The PJTF can contain other information (such as trapping parameters), output parameters (such as screen angles, screen lines, etc.) and some comment descriptions (such as delivery date, customer address, etc.). This PJTF file can be attached to a PDF document, but does not change the content of the PDF document. As a result, the combination of PDF and Jobtickets maximizes flexibility and product security.
In order to automate the output of PDF data streams, Adobe recently researched and developed Extreme technology, a new technology originally used for digital printing that provides Ren dern and handles multiple tasks simultaneously. Because PS processes files independently based on the amount of file data, Adobe Extreme then converts the PS document, which makes it easier to post-process and output. Adobe Extreme can provide multiple task queuing, and can pre-set each visit parameter in each task list. This technology will serve as the basis for the PDF data output system. Based on its high-speed processing characteristics, many manufacturers have already taken a fancy to this new technology.
This kind of browsing of PDF files is not limited by the operating system and network environment, and will also provide strong support for its development as a prepress. PDF technology not only provides benefits for the prepress processing field, but also has many follow-ups in the Internet field and CD-ROM field. Therefore, the PDF format will help transform the entire industry in the future, and will also help lead pre-press companies to develop into media companies.