[Coco] Rainbow archives in DjVu
deek at d2dc.net
Tue Mar 24 13:11:24 EDT 2009
> Sounds really interesting. I definitely want to take a look at the new format.
OK, having completely rewritten my processing method (again...) I believe that
I'm ready to start uploading somewhere. As a bit of a "taste", those who want
to compare my DjVu files with the original PDFs can take a look at
and compare with
The original is 98.2MB, and with my latest compression scripts it comes down
to just a bit over 7.5MB including giving the inside and outside covers a bit
of extra quality for the huge background color fills.
Any comments as to how I might improve the technique are welcome.
I can provide the scripts and instructions for using them to anyone who wants
them, but I warn you that you will need Linux, the GIMP, netpbm, GIMP-Python,
the djvulibre tools, at least half a gig of memory, and a pretty fast CPU.
On my 1.13GHz P3 laptop with 512MB, with very little else running, the
procedure takes up to a minute per image, and sometimes swaps: making 11
different in-memory copies of a 42MB page image tends to do that :). I wish I
could find a way to get this kind of quality without so many in-memory images,
but they all appear to be necessary. Oh well, the CoCo is worth it. :)
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