Paper books are increasingly being sold as collector's books, and publishers are seriously considering moving to electronic distribution of books. Readers are now available books in digital form. True, in order to comfortably read the next book, you will have to install special programs on your computer for reading various formats. What is Dejavu (DjVu)? This is just one of the formats of electronic books. It is used
Attackingly often, so it’s good to find out more about him.
First of all, let's find out what are the differences between DjVu and other formats. Most digital text formats are created using text recognition during scanning (with possible subsequent editing). The deja vu format is a scanned image of the source file. It contains two layers - a text layer (to facilitate the search in the text) and a design layer that preserves all the fine details of the pages.
DjVu was created to fully copy books with accurate
transferring the slightest touches and conventional signs, which makes it indispensable in the scientific field. Before the world knew
what Deja Vu was, ancient books were stored in databases as a set of large-sized images. The use and viewing of such books was inconvenient, and when the text was recognized, their scientific value was lost.
The format turned out to be no less useful for scanning technical literature. All formulas, even the most non-standard and sometimes hand-written, are displayed perfectly, as if you were reading a paper original. As a rule, DjVu books take up a very small amount of hard disk space due to the special compression technology. The sacrifice is the number of colors (usually reduced to 2) and background images that do not carry meaning or have no value to the reader.
Having met a book in this format, you will first of all need a reading program - Dejavu Reader. It takes up a few megabytes and does not clutter up the system. In combination with the small volume of the books themselves, this allows you to store a whole library on a computer or server without experiencing a shortage of physical memory.
Most often, what Deja Vu is, people learn only with unsuccessful attempts to open an unfamiliar format. And all because of the unwillingness to read the description of the book, where with high probability there is a link to a free program for reading. It is unprofitable to include the program in the archive with each book as one of the advantages of the format will be lost - a small file size. Compared to PDF, Dejavu wins 3-5 times in volume, second only to the colorful design and editing capabilities.
If the book is not divided into layers, then text search will not be possible, in this case only the table of contents will help in navigation. You cannot edit such a book, unlike the same PDF. But books are needed primarily for reading, and notes and notes can be created as a separate file.
Now that you know what Deja Vu is and how to open it, you can access a huge amount of literature distributed in digital form, whether it be an old physics textbook or a manuscript poem by one of the classics.