The problem is that many new IA pdf files have a poor resolution / too high compression from beginning, so their quality can't be improved.
IA viewer doesnìt use pdf or djvu file, it uses jpg images coming from jp2 images; this explains why images seen by the viewer are so beautiful, while pdf or djvu files are poor.
@Sam: About uploading djvu into IA item lacking of it: no, nobody but the original contributor or a sysop can upload files into an item. But it can be uploaded as a new item linked with the original one; its link could be shown into source item adding a comment (a "review"),
2017-01-02 12:52 GMT+01:00 Ankry ankry@mif.pg.gda.pl:
Very interesting.
About djvu files on IA, they can be built simply by pdf2djvu from pdf files of IA, but quality is very poor;
[...]
Did you try to set the -d parameter to something higher than the default 300? While converting PDF files from Polish digital libraries, I often use -d 450 or -d 600 with good results.
Ankry
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