View deja vu files. Djvu - what is this format, how to open it and what programs to use for reading files in deja vu on a computer or android

DjVu program Reader is an easy-to-use, low-power browsing tool graphic files DjVu format.

DjVu format (from the French déjà vu - “already seen”) - storage format graphic images with losses. It was developed in the late 1990s by AT&T specialists. This format was originally created for storing scanned copies of books, magazines, and newspapers. The format is also effectively used for storing documents for which design details are important.

Program DjVu Reader built using an open source library source code DjVuLibre. The program does not require installation, it is launched from the archive unpacking directory.

DjVu Reader allows you to simultaneously work with several DjVu documents. Please note that the tabs with document names are located not at the top, as is now common in most programs, but at the bottom, which seems somewhat unusual, but is no less convenient.

Functionality of the DjVu Reader program

The program menu consists of only two items: “File” and “Help”. In the “File” menu, operations are available to open a file, exit the program, and clear the list previously open documents. Available in the Help menu short information about the program, from which it is clear that the program was developed by our compatriot Dmitry Garkaev.

There are two groups of image manipulation operations available on the toolbar: view mode and page mode. In viewing mode, you can choose to show the background, foreground, mask, or the entire color image separately. In Page mode, you can choose how pages are grouped when displaying a file.

The zoom bar and page navigation bar are also located on the Quick Access Toolbar.

Each of the panels discussed can be closed and then reopened from the “Toolbar” menu located at right side viewing areas.

To the left of the viewing panel there is another service panel, which can operate in one of four modes:

information;
setting;
preview;
content.

In the setup mode, the user can adjust the brightness and contrast values; in the preview mode, the user can select specific page to view it by its thumbnail image, in the content view mode – navigate through the document by sections of its content.

So, the considered program for viewing files in the DjVu format is a lightweight and extremely simple utility for reading documents, while having all the necessary functionality.

DjVu Reader easy program for a pleasant reading.

Hello, dear readers of the blog site. You've probably come across scanned images on the Internet. books in Djvu format(their files have the same extension).

Usually, it is not fiction that is distributed online in this way, but books containing drawings, graphs, formulas and other things that are quite difficult to translate into digital format using text recognition programs.

At first I thought that this strange djvu() format was a regular set raster images(photos) resulting from scanning the book. But in this case the file size would be very large, and we do not observe this.

What is a file with such a mysterious extension and how can you open it to start reading the information contained in “déjà vu”, and what programs are best to use. I will try to answer all these questions in this article.

What is a Djvu file?

It turns out that djvu was developed about fifteen years ago and is a very successful mixture of test and graphic formats. In principle, when digitizing books, two scenarios are possible:

Perform text recognition on a scanned page and save it using compression algorithms, which allows you to get a very small weight of the final file. The downside is that you lose images, backgrounds, marginal notes, dog-ears, and other things that may be important in some cases. But it will be possible to conduct a full search using recognized texts.
You can save scanned texts as pictures, for which these or tiff are suitable. However, the weight of even one scanned page will be prohibitively high if we want to maintain quality. Well, it will be impossible to search through texts.

Djvu combines the advantages of the methods described above, while having virtually no disadvantages. Format Deja vu can be classified as text-graphic, which in itself already sounds unusual, but it promises a lot of dividends. Judge for yourself:

The original scanned image is compressed in Djvu ten times more tightly than it would be using JPEG, and its quality remains virtually unchanged. At the same time, jpeg will definitely blur both text and graphics, and everything that is possible, and our hero will leave everything in its original form.
An A4 sheet, scanned and converted to déjà vu, will weigh around 50 kilobytes (read about that) if the source had color graphics (or background), and around 10 kilobytes if it was black and white. Lepota, and this is taking into account the fact that the scanning was carried out in high resolution 300 DPI. The same file saved in tiff format(without loss of quality), would weigh several hundred times more.
The Djvu file contains a text layer through which you can conduct a full search, and if you wish, you can leave only it (removing the color mask and background information), which will further reduce the size.

All this is achieved thanks to a rather original approach. I could be wrong, but in my opinion it is as follows:

Separate the text of the page and its background. The algorithm monitors many factors and correct settings may even rip out the text component from the cover of a magazine, where words can also be used as a background.
The text is saved in a one-bit version (black and white) and is compressed quite tightly.
The background is saved separately and compressed a little less efficiently.
Information about the color of the text and illustrations used in the book is also compressed, but using a different algorithm.
As I already mentioned, Djvu format provides for a separate text field, thanks to which you can search through scanned books.

But the questions of creation and principles of data formation in déjà vu files are of interest to us insofar as, and it will be much more interesting to find out how they can be open and read Djvu.

Naturally, for this purpose they are used special programs for reading (readers), which can be used both for a computer and for mobile devices based on Android or iOS (ipad, iPhone). It’s convenient, after all, on the way home or to work to increase your level of education by reading a smart book on your mobile phone.

How to open Djvu - reading programs on a computer

There are several programs that are focused on working only with déjà vu files, and there are a number universal solutions, which allow you to read books in almost any form. There are also Djvu editors that allow you to edit or even create your own masterpieces.

Among Deja Vu readers designed for computers, it is worth highlighting the following readers:

It fully supports the Russian language and even managed to be captured by the “great and terrible” Yandex, forcing you almost by force and by default searching in all your browsers:

In general, they make it possible to abandon all this wealth (including), but not everyone pays attention to this when installing the program. Of course, with the same one it all looks even more intrusive, but the leading Runet search engine has also already filled all the free programs with its add-ons to the point of “don’t play around.”

As I already mentioned, Djvu can have a text layer embedded, so when reading books containing it, you can search by words and phrases.

On the left, WinDjView has a navigator with page thumbnails, and at the top there is a toolbar where you can open new file, change the scale and type of page display (endless strip or imitation of a book spread), and also rotate them, if necessary, at an angle multiple of 90 degrees.

What’s noteworthy is that this deja vu reader opens new books in new tabs, which allows you to work with several materials at once in one program window. It is also possible to make bookmarks and leave comments (from the context menu right button mice). Can be used magnifier from the toolbar and full-screen viewing mode (in this case, pages can be turned through with a simple mouse click).

If you select from the menu WinDjView programs“File” - “Settings”, then on the second tab you can set the inversion of colors (for example, in order to read white text on a black background), as well as adjust the brightness, contrast or gamma for better perception of the document in Djvu format.

At the beginning of the article, I mentioned that in déjà vu, the scanned document is broken down into a black and white text component, a background, and foreground color information. So, in WinDjView all this can be clearly seen by selecting “view” - “mode” from the menu.

Last current version dates back to 2005 (version 2.0.0.26) and its compatibility with modern OS is not guaranteed, although on mine Windows Vista it still works, although not as quickly as its modern counterpart described just above. It does not require installation and works directly from the folder where you unpacked the archive with the program.

During installation, you need to check the box that you will not use this reader for commercial purposes, so as not to pay for the program.

Well, the same STDU Viewer will ask you what exact file extensions you would like to associate it with, other than déjà vu.

In principle, there is nothing so global in this reader that would not be in WinDjView, but... Firstly, it’s captivating great amount formats, which can be opened and read using this program.

Secondly, a very convenient and thoughtful interface.

Almost all of the reader’s functionality is displayed in the form of toolbars located around the entire perimeter of the program window. The place where page thumbnails are usually displayed book to read, has as many as six tabs located at the bottom.

Not all of them apply to Djvu, but still. The same bookmarks, which can be designed in the form of a tree, can easily replace the missing navigation in your reference book or reference book.

The brightness and contrast settings are also displayed as an icon in the lower right corner, where there are also buttons for switching the document display mode.

Thirdly, there are some nice functional delights that will help during daily work with STDU Viewer:

Well, fourthly, there is a huge number of settings that can be made in STDU Viewer so that this reader is fully suited to your habits and needs.

For example, you can configure (File - Program Settings) even appearance tabs, which, of course, is a trifle, but quite pleasant:

Djvu readers for Android and iOS (iPad and iPhone)

For some reason, I mostly manage to read books on the road, but there are always a lot of other, more important and interesting things to do. In this regard, I was faced with the task of downloading some suitable deja vu reader for my favorite iPad, received as a gift from Profit Partner, but also in combination with everything - for a phone based on Android.

At the same time, I try to try everything free options programs and applications before coming to the conclusion that I have no other option but to part with my hard-earned money. Actually, the main candidates for the place of Djvu are e-readers for iOS on the Internet. DjVU Book Reader.

Everything seems to be fine, both reviews and screenshots, but they are asking for it, albeit a small, but still a sum of money (169 rubles). I thought that the light had not converged like a wedge on this software and I was in Apple Store entered into search bar the word Djvu and asked to filter only free applications.

After testing for opening various files in the format of deja vu and evaluation of usability and functionality, among free programs for iPad a clear leader has emerged - KyBook.

The software is unique, in my opinion, because while it is free, it fully supports EPUB, FB2, PDF, DJVU, CBR, CBZ and audiobooks in MP3, M4A, M4B formats.

When reading, the pages turn beautifully (the animation can be customized), there are a lot of settings and functionality, such as creating bookmarks, leaving notes, searching through the contents of a book, etc. things that are available from top panel tools.

The KyBook reader has unexpectedly many settings:

Including there is separate group settings of this reader for PDF formats and DJVU:

In the library of this reader, you can sort books, create shelves for them, move files between them, rename them, and do everything that is usually required from such programs.

In addition, it is possible to use your existing applications for working with cloud storage systems such as , or Google Drive.

True, by providing access to your files in Dropbox and other clouds, KyBook warns you that it can even change them, which I personally don’t really like.

So I Djvu files are thrown into Dropbox folder on the computer (via Wi-Fi), after which I open application of the same name on Ipad and add them to favorites so that they don’t drag on later mobile internet, which is not always fast and also limited.

It seems to me that it will be safer this way.

Now it’s time to move on to the question of how to open Djvu on Android. The Internet told me that optimal options are two free apps, which I still use to this day, because I didn’t have any particular complaints about their work, but just in case I left both of them in case one of them won’t be able to open some twisted deja vu file.

So, I present to you deja vu readers for Android:

Good luck to you! Before see you soon on the pages of the blog site

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DjVu Reader free download, DjVu how to open

In French, the phrase “deja vu” means “already seen.” This is the name for the technology for compressing scanned images, necessary for distributing and storing complex documents with big amount text, formulas, drawings, diagrams or photographs. The resulting files are designated by the appropriate format, sometimes called text-graphic. But if the file extension occurs DjVu, how to open information found? An application has been developed specifically for this purpose. Deja Vu Reader- a simple and convenient “reader”. At the bottom of our page there is a link that can quickly be sent to your computer.

Characteristics and main features of the Deja Vu program:

free viewing and reading of any documents in DjVu format;
setting page parameters - brightness, color, contrast of text and pictures;
four viewing methods - page by page or in the form of an album, book, booklet;
options full screen mode and a regular program window;
great scaling capabilities (changes from 20 to 400%);
function of loading several files at once;
support for hotkeys and tab navigation;
the ability to copy a page to the clipboard;
Go to any page of an open document.

The reading program is equipped with a status bar that displays the number, opening time, image resolution, and a convenient thumbnail bar in page numbering order (on the left side of the window). Smaller copies of pages allow you to see the structure of the entire document, and with the help of thumbnails you can quickly switch to any page. The preview block can be hidden or its configuration can be changed in a way that is convenient for the user. Deja Vu program completely controlled from the keyboard, so it is usually recommended download DjVu Reader for laptop, so that you can easily use the reader on the road, on vacation, etc.

Text or an image that needs to be saved or moved to another medium can be exported to a common graphic format or copy text layer. The DjVu Reader program has been widely and successfully used for more than seven years, and the developers no longer support this “deserved” version. However, the ease of operation of the reader, the interface is very clear to any beginner and the fact that the widespread formatDjVu has not yet lost its relevance, this application can be considered quite in demand.

DjVuReader download free

Download Deja Vu Reader for free Russian version for computer. Our website monitors all software updates so that you have latest version DjVuReader.