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Any2DjVu Server Information Page

About the Any2DjVu Server | DjVu Conversion Information | Supported File Types

Thank you for your interest in the Any2DjVu Server. The Any2DjVu Server has been established at DjVu Zone to provide an easy and efficient way to convert files in various formats to DjVu.

What the Any2Djvu Server Does

    On entering the server, users are first taken to a page offering them a choice of whether to upload their documents or have us download them from the Web as well as a choice of what broad type of document they wish to have converted. This information is used to create a full upload form with various conversion options dependent on the document type and an appropriate upload/download mechanism.

    Once a file has been loaded, it is immediately converted with the chosen parameters and OCR'ed if that option has been chosen. Users may follow the progress of the conversions on the "live log" output page which captures processing information and any error messages that might result. When the process is finished, a link to the DjVu file appears at the end of the log page.


DjVu Conversion Information

    The upload form is designed to make selected DjVu conversion parameters as easy as possible. The initial upload page has a pull-down selection menu showing various broad file types that are associated with different conversion options. These include the following:

DjVu Document
Documents already in DjVu format, either 2.0 or 3.0, do not call for special conversion options other than possible OCR. Files that need upgrading to 3.0 are detected automatically. If you wish to have OCR run on the document and a text chunk inserted, which will allow internal searching with the DjVu Plug-in Find feature, select OCR.
PS/PS.GZ/PDF Document
Similarly, Postscript or PDF files are handled by a special command that determines most parameters automatically and thus requires no user instructions other than the OCR option.
Photos and other images that are essentially pictures are converted by the special phototodjvu program. The only user option is the image and background quality, which can be set in one of three ways: the default phototodjvu settings (Normal), higher compression at the expense of some quality, or higher quality at the expense of compression.
Black and White Scanned Documents (three choices depending on dpi)
The initial consideration with black and white (as well as color) scanned documents is the resolution (usually measured in terms of dpi, or dots per inch) at which they were scanned. The form offers selection of 200 for lower resolution documents, 300 for medium resolution documents, and 600 for high resolution documents. The major optional concern with bitonal documents is the text quality. The user can choose aggressive, where higher compression is achieved at the expense of some quality, the default for bitonaltodjvu (normal), or lossless where the highest quality is maintained at the expense of possible compression. The last consideration is the familiar OCR option.
Color or Mixed Scanned Documents (three choices depending on dpi)
Where photos are concerned mainly with image and background quality and black and white images with text quality, Color or Mixed Scanned Documents require attention to both these features as well as the document's original resolution. As with black and white documents, there is an initial choice of resolution as well as a choice of text quality and the OCR option. As with photos, there is also a choice of image and background quality. With both text quality and image and background quality, the tradeoff is between higher compression and higher quality.
Document Orientation (four choices indicated by icons)
The orientation of an image is an important consideration when converting images to DjVu. The upload form shows four icons with the word "Text" placed in such a position as to indicate orientation.
The default is right side up, but there are images for documents which are upside down or positioned sideways, either right or left. Choosing the orientation that matches that of the original file, whether it is the position of text or of a picture, allows us to "rotate" the image properly during DjVu conversion, so that the top of the image or text will appear right side up in the DjVu version.


Supported File Types

    Any2DjVu accepts files in various formats, including Postscript, PDF and most of the popular image formats. These include:

  • BMP
  • DjVu
  • GIF
  • JPEG
  • PBM
  • PDF
  • PICT
  • PNM
  • PS/PS.GZ
  • TIFF
  • TIFFG4
DjVu, PNM, and TIFF files, as well as Postscript-based documents, may contain more than one page and will be processed as multipage documents by Any2Djvu. Files in other formats can be converted to multipage DjVu documents if they are bundled together and uploaded as tar or zip files. Any2DjVu cannot at the present time accept files in Microsoft Word or other formats that make use of proprietary encoding schemes. If you have the means to convert such files to Postscript, however, you can submit the Postscript version.

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Copyright 2002 Yann LeCun, Leon Bottou, Jeffery Triggs, All rights reserved.
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DjVu: The Technology for Scanned Documents on the Web
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