Manual:How to use DjVu with MediaWiki

Translate this page

DjVu redirects here. This page explains how MediaWiki could work with DjVu. For help page on how to create a DjVu file from a PDF, see Creating a DjVu file.

How that works?

Example

Example - Page 5

Manual:$wgDjvuDump — Path of the djvudump executable.
Manual:$wgDjvuOutputExtension — File extension for the DJVU post processor output.
Manual:$wgDjvuPostProcessor — Path of the DJVU post processor.
Manual:$wgDjvuRenderer — Path of the ddjvu DJVU renderer.
Manual:$wgDjvuToXML — Path of the djvutoxml executable.
Manual:$wgDjvuTxt — Path of the djvutxt executable.

How to install on GNU/Linux

For MediaWiki-Docker, run the following command to install all the necessary packages.

docker compose exec -u 0 mediawiki bash -c 'apt update && apt install djvulibre-bin netpbm'

Install DjVuLibre:
− Download the DjVuLibre package (which includes "djvudump" and "ddjvu" files). And, in the path:
```
./configure
make
make install
```
− Or use aptitude or Synaptic in Debian derivatives (package djvulibre-bin)
Install netpbm and netpbm-progs packages (use aptitude or Synaptic in Debian derivatives)

Finally, add (or modify) the code lines below in the LocalSettings.php file (not in the DefaultSettings.php):

$wgFileExtensions[] = 'djvu';
$wgDjvuDump = "djvudump";
$wgDjvuRenderer = "ddjvu";
$wgDjvuTxt = "djvutxt";
$wgDjvuPostProcessor = "pnmtojpeg";
$wgDjvuOutputExtension = 'jpg';

For better thumbnails quality:

$wgDjvuPostProcessor = "ppmtojpeg -quality=100";

Can also use png thumbnails with:

$wgDjvuPostProcessor = "pnmtopng";
$wgDjvuOutputExtension = 'png';

How to install on Win32

Download the DjVuLibre software (which includes "djvudump.exe" and "ddjvu.exe" files).
Install in C:\DjVuLibre (for example).
Download the NetPbm complete package (which includes "pnmtojpeg.exe", "pnmtopng.exe", ... files).
Install in "C:\GnuWin32\NetPbm"
Add C:\GnuWin32\NetPbm\bin to the Windows PATH Environment Variable (and reboot the computer).
Finally, add (or modify) the code lines below in the LocalSettings.php file (not in the DefaultSettings.php):

$wgFileExtensions[] = 'djvu';
$wgDjvuDump = 'C:/DjVuLibre/djvudump.exe';
$wgDjvuRenderer = 'C:/DjVuLibre/ddjvu.exe';
$wgDjvuTxt = 'C:/DjVuLibre/djvutxt.exe';
#$wgDjvuPostProcessor = 'pnmtojpeg.exe';
$wgDjvuOutputExtension = 'jpg';

PHP needs memory to create thumbnails: this means a high "memory_limit" (~ 128MB) in the php.ini.

How to install on OS X

Install djvu and netpbm using the Homebrew package manager.

brew install djvulibre netpbm

Follow last step of install on GNU/Linux

Next to do

How to install DjVuLibre, Qt and netpbm on a server.

Problems and solutions

If you got “Error creating thumbnail: terminate called after throwing an instance of 'DJVU::GException' ppmtojpeg: EOF / read error reading magic number” when view file, increase the $wgMaxShellMemory .
Under $wgDjvuOutputExtension = 'jpg' you can force pictures to PNG format with a client-side script. Useful wherever you don′t control MediaWiki setup.