Imagemagick does the job.

Command I used was this:

convert -colors 2 -density 600x600 -colorspace gray -compress group4
pg_0015.pdf pg_0015.tif

The tif files generated are bitonal and the djvulibre bitonal
algorithm cjb2 works fine on them.

Was not able to batch, so I used openoffice spreadsheet to generate a
script containing 774 lines for the 774 images I had to convert. :-)

Alexandru I. Cabuz
Tel: +40 (0)722.478.168

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