2017-01-25 8:40 GMT+01:00 Sam Wilson <sam(a)samwilson.id.au>au>:
On Wed, 25 Jan 2017, at 03:27 PM, Andrea Zanni wrote:
On Wed, Jan 25, 2017 at 1:45 AM, Sam Wilson <sam(a)samwilson.id.au> wrote:
Yann, do you mean you're getting good quality DjVu generated from the PDF?
Or from the original scan Jpegs?
AFAIU, Yann is using ABBYY finereader to generate a djvu and then uploads
it directly to Commons. So outside of our ia-upload tool.
Ah, okay. So if it could be done in the tool, that'd be nicer.
Yes, it is a question of settings.
Aubrey: when you say directly use the PDF, you mean
for the tool to copy
that across to Commons and not create a DjVu?
Yes.
If the Djvu quality is much lower than the PDF there's no reason to use
the djvu over the pdf :-(
DjVu has to advantages over PDF: better compression, so small files for
the same
content, and better management of the text layer.
Over if the compression is too high, the quality is not good. It is a
question of a compromise between quality and size.
Yann
Are we saying that we *never* want to use the IA PDF?
That if there's a
DjVu we use it, and if there isn't we generate our own DjVu from the JP2
and djvu.xml files? Or should the tool user make this call and we give them
a drop-down list of "PDF only", "Generate DjVu from PDF", and
"Generate
DjVu from original scans" with a note about the last of these being higher
quality but slower?
I think I'm in favour of just generating a high-quality DjVu and making it
simpler for the end user. But we want to be flexible too. jayantanth
mentioned <https://github.com/Tpt/ia-upload/issues/15> that he'd like to
be able to just upload the PDF for example.
I can have a look at adding that feature perhaps? (Anyone else working on
this?)
Please ;-)
I can try! :-)
Aubrey
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