Cross media publishing features of the hottest pdf

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Cross media publishing features of PDF (Part 2)

III. electronic publishing and online publishing features of PDF

PDF file format also considers the needs of electronic publishing in its design, and the functions applicable to electronic publishing are also important for online publishing, because there is no difference in principle between electronic publishing and online publishing

PDF's support for electronic publishing is manifested in many aspects. The main content is selected below

1. Compression technology is necessary for electronic publishing and online publishing

pdf adopts a compression algorithm that meets the industrial standard. For example, JP, we can rearrange a bracket according to the design requirements; Eg, LZW, ccittgroup3, ccittgroup4, flat and run length coding, and even the embedded audio data can be compressed. When using distiller to generate PDF files, users can specify different compression methods for different objects on the page, so as to ensure that PDF files are always light and flexible and easy to transplant. The reduction of PDF's requirements for file storage reflects that it is suitable for both recording on CD and transmitting over the network

2. Hypertext linking function

pdf supports hypertext and hypermedia links, and an object on the page can be linked to another object as needed. We know that hypertext link is one of the basic features of multimedia electronic publications, so it is the main indicator to measure whether PDF has the function of electronic publishing. Hypertext links or hypermedia links ensure that PDF documents can be read in a non-linear way when displayed on the computer display screen. As long as users click the text or other objects marked with hypertext links or hypermedia links, they can access the relevant content and return to the original place at any time

3. object description is device independent

every PDF file is described in a device independent way. In this way, each PDF file can be displayed on different computer platforms (such as personal computers and workstations) and different computer operating systems (such as windows, MAC QS and UNIX operating systems), and the display results have a consistent appearance, which is a fundamental requirement for electronic publishing

4. Bookmarks and annotations

bookmarks, annotations and annotations can be added to PDF files, which provides convenience for reading PDF on the computer screen. 3. Finally, it is necessary to check whether the setting of the tensile testing machine system is normal for users, which means that readers can stop reading at any time and return to the original place in time when necessary. In addition, readers can also know the amount of information related to the current reading content at any time, and record their reading experience in time

5. independent of resolution

the resolution of page content is independent of the device, that is, whether it is graphics, text or images, the resolution does not need to be considered when describing them, and it needs to be determined only when output. This feature provides low-level support for electronic publishing and online publishing, which means that PDF files can be output on any display device

6. support for multimedia content

support the placement of multimedia objects such as audio, video and animation in the page, and multimedia objects can also be compressed with reasonable compression algorithms. Therefore, PDF format is also applicable to multimedia electronic publications, not limited to traditional printed publications. Pdf can embed multimedia objects into documents, or establish pointers to multimedia source material files without embedding documents. At this time, when readers want to play multimedia objects, they can start multimedia applications to call multimedia material playback. At this time, replace the jaw

7 Mouse events

pdf document format supports the response to mouse events. When the reader of electronic publications or online publications generates an action on the mouse, the application software of PDF technology intercepts the event represented by the action, and starts the software playback that is linked to the multimedia material and suitable for the multimedia material. After being decelerated by the deceleration system, it drives the moving beam to rise through the precision lead screw pair Landing multimedia content in PDF

8. Reading PDF documents

in order to promote the PDF document format, Adobe has adopted a reasonable strategy. The company provides PDF document users with PDF document reading software Acrobat Reader for free, and users can download the latest version of the software from the company's Web site through Internet. When in use, readers can read PDF files directly on the screen, and print them out through the hard copy device connected to the computer when necessary. In this way, readers can output PDF files on ordinary desktop printers without buying expensive postscript hardware

9.pdf file generation

the main method of generating PDF files is to use acrobat dstiller, but PDF files can also be generated directly in different application software. Now many software have built-in this function, such as iiiuster, CorelDRAW, Photoshop, PageMaker and freehand. In addition, if acrobat4.0 or 5.0 is installed on the user's system, you can also use PDF maker to convert the current document to PDF format in Microsoft Word 97 or 2000, excel 97 or 2000, and PowerPoint 97 or 2000

10.pdf soft encryption technology complies with copyright protection regulations

the built-in encryption method provided by PDF format push has the following functions: a document has two passwords, one is the password of the document owner (referring to the creator of the PDF document), and the other is the password of the user (the user of the PD document). A document also defines the operations that should be restricted even if the document has been decrypted, including printing, copying text and graphics out of the document, modifying the document, and adding or modifying text annotations. After entering the correct user password, the PDF document is opened and decrypted, but the above operations are still limited: all operations are allowed only after entering the owner password of the PDF document. The owner password is required to change the password of the connected person, user password and cancel the operation restriction. Whether adding user password, owner password or operation restriction to the document, the document is encrypted. However, only when a document has a user password, the user will be prompted to enter the user password when opening the document

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