DjVu (From the French. déjà vu "Deja vu") - image compression technology with a loss, specifically designed for the storage of scanned documents - books, magazines, manuscripts and so forth., wherein the abundance of formulas, charts, drawings, handwritten characters makes it extremely time consuming their full recognition. It is also an effective solution if you need to transfer all the nuances of the design, such as historical documents, which is important not only the content but also the color and texture of the paper; defects parchment cracks, traces of folding; patches, blots, finger prints; traces left by other objects.
DjVu technology is a multi-platform, open, open source, free alternative PDF technology. Now, more and more often in this format, there are documents, scanned magazines, technical documentation. To lament this file format requires a special program, for example WinDjView.
This compact program has a handy document viewer: tabs (Alternatively it can open each document a separate window), continuous scrolling, advanced printing capabilities, rapid scaling at very low system requirements. The documents you can put bookmarks and write annotations. Pages can export to BMP. The program has an interface in many languages, including Russian and Ukrainian, as well as a version for Mac-users. Link:
http://windjview.sourceforge.net/ru/.