Changes for page DJVU

Last modified by Kashif Iqbal on 2019/02/06 13:39

From version < 4.1 >
edited by Kashif Iqbal
on 2019/01/16 18:08
To version < 5.1
edited by Kashif Iqbal
on 2019/02/06 13:39
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1 1  DjVu, pronounced as “déjà vu”, is a graphics file format intended for scanned documents and books especially those which contain the combination of text, drawings, images and photographs. It was developed by AT&T Labs. It uses multiple techniques like image layer separation of text and background images, progressive loading, arithmetic coding and lossy compression for bitonal images. Since DJVU file can contain compressed yet high-quality colour images, photographs, text, and drawings and can be saved in less space therefore, it's used on web as eBooks, manuals, newspapers, ancient documents, etc.
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3 -DjVu can be graded superior alternative to [[PDF>>doc:page-description-language.PDF.WebHome]]. File extensions associated to DjVu are .DJVU or .DJV. DjVu can achieve compression ratios about 5 – 10 better than existing methods such as [[JPEG>>doc:Image.JPEG.WebHome]] & [[GIF>>doc:Image.GIF.WebHome]] for color documents and 3 – 8 times better than [[TIFF>>doc:Image.TIFF.WebHome]] in black and white documents. Scanned documents at 300 DPI with full colour upto 25 MB can be compressed down to 30 to 100 KB. Similarly Black and white documents can be compressed upto 5 to 30 KB. Average HTML page can be upto 50 KB, therefore, these documents can be uploaded on net without any problem.
3 +DjVu can be graded superior alternative to [[PDF>>doc:page-description-language.pdf.WebHome]].  File extensions associated to DjVu are .DJVU or .DJV. DjVu can achieve compression ratios about 5 – 10 better than existing methods such as [[JPEG>>doc:Image.JPEG.WebHome]] & [[GIF>>doc:Image.GIF.WebHome]] for colour documents and 3 – 8 times better than [[TIFF>>doc:Image.TIFF.WebHome]] in black and white documents. Scanned documents at 300 DPI with full colour upto 25 MB can be compressed down to 30 to 100 KB. Similarly Black and white documents can be compressed upto 5 to 30 KB. Average HTML page can be up to 50 KB, therefore, these documents can be uploaded on net without any problem.
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5 -== Brief History ==
5 += Brief History =
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7 7  The DjVu technology was developed in AT&T labs by [[Yann LeCun>>url:https://en.wikipedia.org/wiki/Yann_LeCun]], [[Léon Bottou>>url:https://en.wikipedia.org/wiki/L%C3%A9on_Bottou]], Patrick Haffner, and Paul G from 1996 to 2001. The DjVu file format has passed through various revisions, the most recent being from 2005.
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17 17  |(% style="width:77px" %)25|(% style="width:228px" %)May 2003|(% style="width:421px" %)NAVM chunk. Support for DjVu bookmarks was added.
18 18  |(% style="width:77px" %)26|(% style="width:228px" %)April 2005|(% style="width:421px" %)Text/line annotations
19 19  
20 -== File Format Information ==
20 += DJVU File Format Information =
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22 22  DjVu documents are IFF85 files. The structure provides a hierarchy of containers which holds information in a DjVu file. These containers are also called “Chunks”. Chunk type and Chunk ID describes how the chunk is used. There is a 4byte header followed by IFF structure. The first four bytes of a DjVu file are 0x41 0x54 0x26 0x54. This section discusses the various kinds of DjVu documents and the corresponding chunks of which they consist.
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