Does IM not read compressed images?

Hi All,

I am reading Djvu files through IM. It reads and displays Djvu files
converted from PPM files perfectly fine; but when the same images are
compressed using the c44 tool provided by DjvuLibre, it throws an error
while reading them saying:

terminate called after throwing an instance of
'Magick::ErrorMissingDelegate'
what():  Magick: no decode delegate for this image format
`/home/cameo/test/PPMTrial/jumbo7_gh00000002.djvu' @
error/constitute.c/ReadImage/532
Aborted

Can anyone tell me why this is happening? Is it so that IM cannot read
compressed djvu images?

-Shantanu