PDF Technology and Its Development and Application (2)

Publishing information and obtaining information on the Internet is now almost universally known. However, publishing articles and publishing books on the Internet is still not popular. In addition to copyright and other factors, there are still some technical issues that need to be resolved. For example: (1) If the content of a book is published on the Internet, it may be tens of thousands of words or as many as several hundred thousand words. Coupled with images, the number of bytes will increase by tens of thousands. As the broadband problem on the Internet has not been truly resolved, the transmission speed is slow. Because the larger the amount of files on the Internet, the slower the transmission speed. A book containing more than 100,000 words, or even 1 million words, and illustrated books and magazines has to be transmitted on the Internet 2 and the financial burden is too great. (2) Files generated by different software on the Internet are difficult to open. Even if they can be opened, the contents of the files may be deviated. Even the different versions of the same software have different contents after opening the file. (3) Unable to read across platforms. Because different computers use different operating systems and their software cores are different, the resulting file format is different. (4) Since the browser used and its version are different from each other, the resolution of the user's display is not the same, so the content of the same web page opening the same website is also different. (5) Due to different languages, there are language barriers when visiting each other. For example, the different character codes used in Mainland China and Taiwan and Hong Kong often make it difficult for Internet users to read each other's web pages. In addition, even if the same region uses the same character code in the same country, the fonts used on different computers may differ depending on the typeface used. This is not bad for sending general information, but books and magazines are not allowed to have font differences. These problems are solved with the successful development of PDF.

I. Features of PDF

PDF is the abbreviation of Portable Document Format, translated into a portable file format. Because of its precise color reproduction, rich image display and easy search functions, it is welcomed by editors and publishers. To sum up, PDF has such features: (1) has a compression function. It can be sent on the Internet in the original document format, or it can be compressed by 1/10 to 1/40 of the reduced size, and keep its contents unchanged. Since the document volume of the original can be greatly compressed, the time for the original to be transmitted on the Internet is also greatly saved. (2) has the function of embedded fonts. You don't have to worry about fonts after using PDF, so you can read across platforms. Regardless of which computer is used or the operating system used, the display results are the same, including different languages ​​and fonts in different regions. (3) PDF supports ICC and Cologync color management schemes, which can ensure the consistency of the color of the output color images displayed on different computers. This was difficult in the past. (4) PDF has a security function that facilitates digital signature of official documents and contracts. The above features of the PDF remove the technical obstacles for editing, publishing, printing, and distribution of books on the Internet.

Second, PDF and books before printing process

1. Used to send and receive manuscripts and management

Because PDF is a cross-platform file format, text, mathematical formulas, illustrations, photographs, and layout information contained in books and magazines can be transmitted over the Internet and viewed on any computer screen in this file format. Therefore, the successful development of PDF brings a whole new concept to the editing of books and periodicals. In the future, authors of books and periodicals can directly transfer document information, including color images, to the editorial office or publishing house via a PDF file, instead of affixing the floppy disk of the manuscript to the manuscript. image. This saves time, saves on postage, and is less prone to errors. The editorial department or publishing house can edit and process the manuscript in the same way and then upload it to the author of the manuscript in the same way. The sample drafts the author sees at this time are the styles that will be published in the future. Even the colors of the images are exactly the same. Therefore, in the future, PDF files will be used to send and receive manuscripts on the Internet, which will avoid frequent mailings between the current editorial department and the authors of documents, and avoid the embarrassment of requiring the authors to re-supply due to the loss of manuscripts or an image due to improper management. .

2.PDF for manuscript editing

Using computers for editing and processing documents is now a common practice. However, encountering some special symbols in this editing work is difficult to solve. Moreover, in view of the above-mentioned problems such as the inability to read across platforms, the edited manuscript is neither convenient for online file exchanges nor directly used for printing. However, if PDF technology is used for editing of documents, these problems can be solved. Adobe developed two kinds of editing software based on PDF: (1) Incopy 1.0 software. This is a tool for editors to control workflows, such as magazines and newspapers. It allows both the author and the editor of an article to see where the article has changed during the course of the school draft. The author of the article can choose to "typeset" to view the changes or logos that the editor made in the article, or can see the annotation text with the editor's name attached; the editor can follow up on various article changes caused by the typesetting needs, for example, : Paragraph position change, hyphenation, left-right alignment, etc. In addition, Incopy allows editors to preview articles, count lines, and add comments to authors, art editors, and other editors. The function of Incopy also includes precise calculation and change recording of the target block, so that the editor can grasp or set the target block, line spacing, character spacing, shape, etc., and can provide a variety of commonly used job keys when needed to be changed. To solve these problems. (2) Adobe Acrobat Business To Cls software. This is the software that Adobe launched in 2000 to increase the productivity of Adobe PDF users. The software provides many capabilities to simplify document review and approval, improve opinion exchange, and transition from paper media to more efficient electronic workflows. It can even simply convert any web page or site into a PDF file and then email it to the author or editorial office. It also offers users the ability to edit frequently used features such as electronic note highlighting, underlining, circling, and deleting lines; it also allows users to convert real-time Web pages to Adobe's graphics, fonts, colors, and dynamic hyperlinks that hold the page. PDF file. Moreover, for WinDows users, this software allows them to copy and paste texts, forms, and Microsoft Word and Excel structures between Adobe PDF files. With these features, online editing can be achieved.

Third, PDF and printing

In the 1980s, with the increasing maturity of microcomputer technology and the emergence of the PS (Postscript) language, people completed the leap from traditional manual typesetting to computer laser phototypesetting. Today, high-quality color printing is implemented using the PS language, which has become the industry standard. Ordinary users are not fully aware of this and the generated files are difficult to print directly. And PDF technology can be fully used in the printing industry. Its use allows users to obtain clear prints without having to purchase expensive Postscript devices. Because the PDF file is actually a semi-rasterized file, it is device- and resolution-independent. The PS file that was previously required to be interpreted by RIP was distilled into a PDF file, and ordinary users could read or print it smoothly using Acrobat. As a result, the user can see the results that are consistent with the post-printing results before printing, thereby significantly saving time and money. The printout center can also benefit from it. The font problems that caused headaches in the past have disappeared due to the font embedding function that PDF has. The PS file that could not be explained by RIP before was distilled into a PDF file.

It is necessary to make imposition of the typesetting file before the laser photocopying output film. Because PS is a widely used form of programming language, it is a structure that cannot be processed without explaining the entire data. Due to the limited structure of the PS data, it is necessary to reprocess the entire PS file (that is, perform RIP processing on the entire page). This increases the risk of file errors and also extends the operating time. If you use PDF data, because the feature is that each page is completely independent, all the information related to the document, such as size, color, etc. are included on the same page. Therefore, it is only necessary to change the entire page of the correction target. This greatly simplifies the make-up operation, reducing errors and saving time. Therefore, PDF data is very useful for print imposition. PDF is new to most people. Applying it to the editing, publishing, and printing of books and publications will give new meaning to the traditional book publishing industry. At present, there have been attempts to publish magazines in PDF in China (for example, "Prepress Navigation", Issue 6, 1999). We have reason to believe that in the future, as people gradually understand and understand PDF, China's book publishing industry will have new changes.

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