You can see a great advantage of djvu files over pdf files into the present
file list of any IA item. You can see that IA removed djvu files, but it
builds and publishes _djvu.xml file. Why? I presume that IA uses that file
to "map words" into its book viewer, since it has a good text structure
Please take a look to https://archive.org/details/spinoza_etica_paravia_djvu,
this is precisely a djvu-only item that I uploaded some days ago. I asked
for permission to create "djvu-only items" into IA forum and I got it; this
is the fiirst item I created; as you see there's some "implicit
On Mon, 2 Jan 2017, at 05:29 PM, Andrea Zanni wrote:
>
> Ideally, we should talk to IA about this.
> Adding a comment on the IA item is a very low-cost solution and I
> think is important, adding the djvu would be much better. We should
> check if a script can edit every kind of item and
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
> 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
On Mon, Jan 2, 2017 at 10:17 AM, Sam Wilson wrote:
> And if we're building DjVus for Commons from IA files (either PDFs or the
> Jpegs), should we also be adding those DjVus back to the IA item?
> (Actually, can we even edit IA items that we haven't created ourselves?)
>
Very interesting.
About djvu files on IA, they can be built simply by pdf2djvu from pdf files
of IA, but quality is very poor; or they can be built, with some more pain,
from _jp2.zip images merged with _djvu.xml files, the quality is high but
resulting djvu is heavy.
As Aubrey told some time