Last modified: 2006-06-24 08:12:58 UTC

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Bug 6131 - Whitelist uploading of DjVu files
Whitelist uploading of DjVu files
Product: Wikimedia
Classification: Unclassified
General/Unknown (Other open bugs)
All All
: Normal enhancement with 3 votes (vote)
: ---
Assigned To: Brion Vibber
: shell
Depends on:
  Show dependency treegraph
Reported: 2006-05-29 19:05 UTC by Frank Schulenburg
Modified: 2006-06-24 08:12 UTC (History)
3 users (show)

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---


Description Frank Schulenburg 2006-05-29 19:05:15 UTC
For the usage on de:Wikisource we would like to upload DjVu-Files (for our
scanned images, e.g. all scans of on Commons.
Today DjVu does not belong to the accepted file types on Commons. Nevertheless
it is a popular file type in the academic world, especially for compressed scans
of historical books in digital libraries.

DjVu is an Open File Format. The file format specification is published as well
as source code for the reference library. In 2002 the DjVu file format was
chosen by the Internet archive as the format in which its Million Book Project
provides scanned public domain books online.

We propose to add DjVu (.djvu) to the list of accepted file formats for all
mediawiki projects.
Comment 1 Brion Vibber 2006-05-29 20:21:59 UTC
This is not terribly likely to happen unless we can provide useful 
software support for it.
Comment 2 Frank Schulenburg 2006-05-29 20:38:53 UTC
We only want to store the files on commons. DjVu is just an alternative to PDF.
Comment 3 Frank Schulenburg 2006-05-29 21:49:11 UTC
How does Wikimedia provide software support for PDF files?
Comment 4 Daniel Kinzler 2006-05-29 22:33:41 UTC
Hm, the question appears to be if "archive" files (as opposed to things that can
be shown "inline") are useful to Wikimedia. We already support several such
formats (PDF and several OpenOffice formats), so why not DjVu, if it is an open
and accepted format? I agreee that such files are not imediately useful to
Wikipedia, but they may be handy for Wikisource and Wikibooks (and, in
concequence, Commons).
Comment 5 Frank Schulenburg 2006-05-29 22:56:38 UTC
DjVu has several advantages to offer.

* it has a high compression ratio (very small files)
* it loads very fast (in contrast to PDF you can regard the first pages while
the others are loading)
* each page can be adressed individually
* the compression and encoding algorithms were published under the GNU licence

Therefore a pretty good number of research libraries are already offering DjVu
files. Some examples: (Jewish National and University
Library ) (Kujawsko-Pomorska Digital Library) (Numérisation de documents anciens mathématiques) (Million Book Project)
It would be a great step towards a greater acceptance of Wiksource in the
academic world.
Comment 6 Brion Vibber 2006-05-30 07:04:02 UTC
Can you provide some references for supporting software?
Being able to automatically generate thumbnail and medium-size 
inline JPEGs from these would I suspect be very helpful.
Comment 7 Frank Schulenburg 2006-05-30 09:38:25 UTC
The Open Source DjVu library "DjVuLibre" is an implementation of DjVu, including
viewers, browser plugins, decoders, simple encoders, and utilities.

Among other things it includes a set of decoders to convert DjVu to other formats.

You can download it via
Comment 8 Daniel Kinzler 2006-05-30 10:47:18 UTC
I just found an entry on the ImageMagick mailing list that does not sound so

  The open source DjVu is crippled by offering less efficient compression
  You have to buy commercial product in order to use the really cool DjVu

Maybe this has changed over the last three years?
Comment 9 klausgraf 2006-05-30 21:39:07 UTC
I support Frank Schulenburg. Internet Archive is also using Djvu for the
thousands of books it is digitizing. 
Comment 10 Edward Z. Yang 2006-06-18 04:08:37 UTC
Marking enhancement.
Comment 11 Brion Vibber 2006-06-24 07:22:52 UTC
Support for uploading DjVu files with file type validation and
width/height detection added in r14994. Will enable shortly.

Thumbnailing support not yet present, but can be added later.
Comment 12 Brion Vibber 2006-06-24 07:50:22 UTC
.djvu files may now be uploaded.
Comment 13 Frank Schulenburg 2006-06-24 08:12:58 UTC
GREAT! Thank you very much! Greetings, Frank

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