[sane-devel] Re: Unpaper 1.0.1 problem

Janusz S. Bień jsbien@mimuw.edu.pl
20 Jun 2005 19:51:05 +0200

On Sat, 18 Jun 2005  Jens Gulden <mail@jensgulden.de> wrote:


> Try
> ./unpaper -vv --layout double --pre-rotate 0 --post-rotate 0 04b.pgm
> unpaper04.pgm



> I have also tried to find some other settings which make your original
> image better. Try e.g.
> unpaper -vv --layout double --pre-rotate 0 --post-rotate 0
> --mask-scan-threshold 0.4 --grayfilter-size 5 --grayfilter-step 5
> --blurfilter-size 25 --blurfilter-step 15 --blurfilter-intensity 0.05
> --border-scan-threshold 8 04test.pgm unpaper04test_jens.pgm


The original scans converted to DjVu are available as


The scans processed with the suggested settings (and split with
pnmcut) and also converted to DjVu are available at


Although the processing improved the images in some respects, in
general the result seems to me less readable then the
original. Fortunately I can live with it :-).

Best regards


dr hab. Janusz S. Bien, prof. UW -  Uniwersytet Warszawski (Katedra Lingwistyki Formalnej)
Prof. Janusz S. Bien - Warsaw Uniwersity (Chair of Formal Linguistics)
jsbien@mimuw.edu.pl, jsbien@uw.edu.pl, http://www.mimuw.edu.pl/~jsbien/, http://www.klf.uw.edu.pl