[Pkg-gmagick-im-team] Bug#779939: libmagickwand-6.q16-2: MagickSetImageBias() has no effect for MagickConvolveImage()

Andreas Grois dragon.arises at gmail.com
Fri Mar 6 15:29:02 UTC 2015

Package: libmagickwand-6.q16-2
Version: 8:
Severity: normal

Dear Maintainer,

the version of ImageMagick packages with Debian Wheezy suffers from a known and
fixed upstream bug, regarding the application of convolution filters when using
the MagickWand API.

In order to reproduce this issue, try to use the MagickConvolveImage() API
function after using MagickSetImageBias(). No matter to which value the Bias is
set, the outcome will always lack any bias. This issue only shows itself when
using the API. It is not present when using the ImageMagick command line tools.

The upstream bug report can be found here:

According to it, this issue should be fixed meanwhile, in ImageMagick versions
starting from 6.9.0-1 Beta.

Just in case someone stumbles across this and is looking for a workaround: I'm
not sure, but It seems to me, that the MagickMorphologyImage() function does
take the bias into account.

best Regards,

-- System Information:
Debian Release: 8.0
  APT prefers testing-updates
  APT policy: (500, 'testing-updates'), (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=de_AT.utf8, LC_CTYPE=de_AT.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libmagickwand-6.q16-2 depends on:
ii  dpkg                   1.17.24
ii  imagemagick-common     8:
ii  libc6                  2.19-15
ii  libgcc1                1:4.9.2-10
ii  libgomp1               4.9.2-10
ii  libmagickcore-6.q16-2  8:
ii  libx11-6               2:1.6.2-3
ii  multiarch-support      2.19-15

libmagickwand-6.q16-2 recommends no packages.

libmagickwand-6.q16-2 suggests no packages.

-- no debconf information

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