Your message dated Sun, 22 Apr 2007 14:25:04 +0200
with message-id <[EMAIL PROTECTED]>
and subject line Bug#417669: introduces white spots to scanned pages
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--- Begin Message ---
Package: unpaper
Version: 0.2-1
Severity: normal
Processing a scanned page with unpaper -q --dpi 300 (it was a 300dpi
scan) introduces white blocks onto the page. These blocks are
reminiscent of compression artifacts, but I did not think PNM files
are compressed.
See
http://scratch.madduck.net/__tmp__cdt.PYJe9734__out1.pnm.bz2
http://scratch.madduck.net/__tmp__cdt.PYJe9734__out1.unpaper.pnm.bz2
If those files are gone, please rerequest them. They should be on
there for at least 60 days.
-- System Information:
Debian Release: 4.0
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)
Shell: /bin/sh linked to /bin/dash
Kernel: Linux 2.6.18-4-amd64
Locale: LANG=en_GB, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Versions of packages unpaper depends on:
ii libc6 2.3.6.ds1-13 GNU C Library: Shared libraries
unpaper recommends no packages.
-- no debconf information
--
.''`. martin f. krafft <[EMAIL PROTECTED]>
: :' : proud Debian developer, author, administrator, and user
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--- End Message ---
--- Begin Message ---
Jens Gulden <[EMAIL PROTECTED]> wrote:
Hi Jens,
> this is not a bug. Using "--no-grayfilter" will make it work.
> By default, unpaper runs all built-in filters, which is optimal for
> normal black-and-white book pages with text. In this case, however,
> the title cover of a book intentionally contains large areas of gray,
> which requires to set "--no-grayfilter". This is also usually required
> if pages contain photographs, paintings etc. Alternatively, you can
> experiment with the --grayfilter-size (-gs), --grayfilter-step (-gp)
> or --grayfilter-threshold (-gt) parameter settings.
Thanks for the explanation !
JB.
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