How to build multi-page djvu file ?

[bibar]

Hello,
Is there a way to build multi-page djvu file from different image pages as it is possible for pdf file ?
"convert *.png document.djvu" only gives a unique-page file with the first image of the set.
My computer is runing Ubuntu 12.10 and ImageMagick 6.7.7-10 2012-08-17 Q16.
Thanks.

[Bonzo]

Looking at this page djvu is read only:

http://www.imagemagick.org/script/formats.php

[bibar]

Oops, sorry.
The file built has a djvu extension and a djvu MIME type. It was viewable in EOG. I didn't see it could not be djvu
Sorry for this question. I will look further.
Thanks for this reply

[anthony]

djvu format is a special format used for highly compressed scanned images. specifically text.
the generation of that image format is copyright commercial process. The reading and decoding of the format is however free for anyone to use.

While the format is well documented, and programs for decoding and generating djvu files are available, I have not found much information in generating such files.