Alex Brollo, 13/05/2016 11:06:
Simply, from a practital point iof view, my suggestion
is: don't try to
get a good djvu from IA pdf, use instead _jp2.zip images (after
conversion to jpg the images are very good), and the result will be much
better - almost as good as images into IA viewer, that uses the same
images.
In my experience, when there are problems, usually the JP2 images are
either too little compressed or too compressed. This has precise reasons
and no trivial solution:
http://www.digitizationguidelines.gov/still-image/documents/JP2LossyCompres…
Nemo