Cross media publishing features of the hottest pdf

The cross media publishing feature of PDF

postscript is designed for printing and publishing, and has become the de facto industrial standard of digital prepress technology: the multimedia application in the design of PDF document format has developed to a very high level, so it is suitable for printing and publishing and electronic publishing: after the emergence of Web Publishing, PDF still finds its own place of use. Pdf has the characteristics of meeting the requirements of cross media publishing, because it is rooted in post script technology, inherits all the advantages of this technology, and takes into account the needs and technical characteristics of electronic publishing. In addition, the display post script technology is also integrated in PDF to obtain the consistency between hard copy output and screen display effect

cross media publishing requires that after the design and production are completed, the work results can be used for a variety of publishing purposes, that is, one production and multiple use. Cross media publishing also requires that the produced content have adaptive processing characteristics consistent with the publishing purpose, that is, relevant parameters can be set for specific publishing purposes to adapt to the recording technology and media used in the publication

I. cross media publishing and its basic requirements

the basic task of cross media publishing can be summarized as a good method for processing, using and storing data files that can adapt to any kind of output maintenance hydraulic universal testing machine. This basic task can also be used as the definition of the concept of cross media

from the definition of cross media, we can see that it not only summarizes and summarizes the relationship and technical characteristics of digital prepress and digital printing, but also reflects the new requirements of the constantly developing social needs for the printing and electronic publishing industry. At the same time, it also shows the wide applicability of this concept, that is, the cross media concept is the basic requirement for the cross use of traditional publishing, electronic publishing and online publishing content. Cross media publishing requires user designed content to have some basic characteristics

1. adaptive processing characteristics of content

the content needs to be finished after being made. The advent of electronic publishing system has reduced the professional knowledge requirements for operators, and more and more people are engaged in the production of publication content, but there are misunderstandings on the fundamental problem of obvious differences between production and completion. Design and production is only the preliminary work of completing the dissemination of content. During this period, it may not be necessary to take into account the use objectives and recording media of the content, but it should not ignore the importance of completion. After the design and production is completed, it should be targeted for specific communication methods and according to the recording technology and recording medium to be used. This process is called completion. After the cross media concept is proposed, completion becomes more important

taking the production content used for printing operations as an example, after processing, the page should have adaptive processing characteristics for recording information using paper, ink, printing machine and a specific combination of printing processes. For example, when the current page is in other color space, it should be converted to CMYK

color space (this process is also known as color separation in digital prepress process). In order to compensate for the insufficient accuracy of the printing machine and printing plate, resulting in inaccurate overprint, it is necessary to trap the page content. According to the quality requirements and replication requirements of the printed matter, it is necessary to select different adding parameters, add bite marks, cutting marks Signal bar, etc. to facilitate the installation of printing plate, cutting and control the printing quality

2. Modify

everything in the world is developing and changing, and customer requirements may also change. In addition, the designed and produced content cannot be free from errors, such as errors in text input, graphical expression, etc. Therefore, cross media publishing requires that the produced content can be processed and corrected before output, so as to reduce losses and create good conditions for cross media publishing

3. Data format conversion

for the production process of publication content that all adopt digital equipment and digital technology, different publishing methods have different requirements for digital file format, which depends on the characteristics of the recording medium and the mode of transmission of the publication. Therefore, the data format conversion should be carried out as needed after the content production, such as converting the documents used for printing and publishing to post script, EPS or PDF format, and converting the documents used for online publishing to HTML format

from the above-mentioned basic requirements for cross media, it is not enough to rely on traditional output technology for the effective implementation of cross media. It calls for new output technology, such as the supra structure successfully developed by Adobe based on post script

level3 and PDF technology

II. The characteristics of PDF suitable for printing and publishing

the characteristics of PDF suitable for printing and publishing are mainly divided into two aspects: first, it continues to support prepress and printing workflow, and second, the description pages of each PDF are independent of each other

1. The importance of page independence

and little research has been carried out on the fatigue performance of metal rubber. Physically, a poot script file describes the interconnected pages, which are arranged in the order of the contents of the publication. After being output on the hard copy device, a continuous page sequence will be obtained. These pages have sequential relations, logical relations or causal relations. In terms of file structure, each post script file is actually a series of post script instruction sets, which are divided into two parts: object definition and description. The description is about the description of objects. Because of this, it is possible to generate the correlation between objects, and the correlation between objects leads to the correlation of pages, because the related objects may be in different physical pages

the biggest drawback of page correlation is that it is very easy to make mistakes in output. For example, when rip interprets an object on page 5, it finds that it is related to the object on page 2, so rip will jump to page 2, reinterpret the object, and then return to page 5. If you only need to explain it again, it's not a big problem. The guidance clarifies that the three major goals of green packaging in the express industry during the "1035" period are to waste a little time at most. However, the problem is that a related object may be reinterpreted after it is reinterpreted. The result of repeated reinterpretation of reduced production costs is multiple nesting of interpretation, resulting in limit error messages or overflow errors from the post script interpreter when output

the fundamental difference between PDF and post script is that RDF is a document format, not a page description language. Although it also describes objects, there is no programming structure, so pages are not related to pages. Therefore, after the distillation of acrobat distiller, an application that generates PDF files, the correlation between pages is cut off. It can be seen that the irrelevant characteristics of PDF pages make it have the basic functions of cross media publishing, and it can be used for print publishing, electronic publishing or online publishing without additional processing

2. PDF's printing and publishing function

since PDF is based on post script technology, there should be no doubt that it is printed and published. However, PDF format only provided limited printing and publishing functions in the early stage of its launch, and it did not become quite perfect until the release of acrobat version 3.0. Considering that the printing and publishing function of PDF has been discussed in many articles, we do not intend to discuss it in more space here. Collectively, PDF's support for printing and publishing is shown in:

(1) PDF, like post script, uses a method similar to the printing process (template coloring) to generate objects, which is the most fundamental attribute of PDF:

(2) from version 1.2, PDF began to support CMYK color space, which is necessary for printing reproduction:

(3) every post script file or EPS file is always related to the page, This is the main reason why the workflow based on PS or

EPS files often produces limit inspection errors or overflow errors. However, when PS files or EPS files are converted into PDF files, the relevance of pages is cut off, which can ensure that each PDF page can be output stably: