This form of e-books is generally protective, with large information, strong confidentiality and poor readability. Suitable for internal publications, etc.
2. Proprietary format
This form of e-book needs a special reader to read, and its function is relatively fixed. Only a few foreign readers are suitable. The upgrade/secondary development depends on the upgrade of foreign software vendors, which is not conducive to the fast-growing e-book market in China.
3: Universal format
This form of e-book is generally made in a general mixed format of graphics and text. Even if there is no reader, ordinary users can read on their own computers, and customized readers with enhanced functions can play a higher reading efficiency.
Software that supports e-books generally supports extended functions such as "search", "bookmark" and "taking notes", which enables users to concentrate more on the content itself, without having to consider other incidental problems such as the loss of laptops and the forgetting of materials. Moreover, the "search" function can complete the information search that traditional book readers need for more than ten seconds or even longer in a very short time. This is a popular e-book file format, which is also favored by many people, and the production tools of this format are also the most. Its biggest feature is easy to read and simple to make. The produced e-book is quite beautiful and can be read without special reader support. E-books in this format have low requirements for the running environment.
However, this format of e-books also has some shortcomings. For example, EXE files produced by most related production software do not support Flash, Java and common audio and video files, and need the support of IE browser. Moreover, because most e-books in this format cannot directly obtain text and image data. CHM file format is a help file system based on HTML file features introduced by Microsoft in 1998, which is used to replace the early WinHelp help system. In Windows 98, CHM files are called "compiled HTML help files". The JavaScript, VBScript, ActiveX, Java Applet, Flash, common graphic files (GIF, JPEG, PNG) and audio and video files (MID, WAV, AVI) supported by IE browser are also supported by CHM, and can be linked to the Internet through URL.
The disadvantage of this format of e-books is that the user's operating system must be Windows 98 or NT or above. If the operating system of the reader is still Windows 95, you need to install an upgrade package called CHM file reading. HLP file format is a help file system used by early operating systems. This format does not require much for the reader's operating system, and Windows 95 and later versions can run. Many software running on Windows platform, almost all of its help files are in HLP format. Of course, with the introduction of Microsoft CHM help file system and the development of operating system, HLP file format is likely to be replaced by CHM.
The disadvantage of HLP file format is that it is not beautiful enough. Because many people put forward higher requirements for the aesthetics of e-books, there is no market for e-books in this format on the Internet. But what is certain is that this format of e-books is simple to make and easy to obtain, and has no special requirements for readers. In addition, many software help files still use this format, so this format will not quit the historical stage in a short time. WDL is an electronic reading file format developed by Beijing Kang Hua Company. At present, many large electronic publications in China use this format. Its characteristic is that the original layout is well preserved, and e-books can be read online or downloaded locally, but they need to be read by the company's special reader DynaDoc for free, and can be downloaded from the company's website for free.
This format of e-books properly protects the interests of authors and publishers due to the restrictions on printing and reproduction. Like PDF format, this format still does not support some of the above effects. But it supports image import. This format deals well with the balance between the text quality of file images and the final product size, and the compression rate of files using this format is generally high. E-books of all sizes are good choices.
Making e-books in this format requires the company's software DynaDoc generator. There is no * * * version of the software, so readers can go to the company's website to find the relevant information of the software. This format appears, and the reading style is very similar to that of Microsoft reader. E-books in this format can be read by a reader named Glassbook Reader, and the format can also include multimedia documents such as sounds and waves. Barnes &; Noble provides a large number of e-books about this format.