[Pkg-gmagick-im-team] Bug#712493: imagemagick: Imagemagick 6.7.7 changes contrast of b/w images without reason

[Markus Schmidt]

Package: imagemagick
Version: 8:6.7.7.10-5
Severity: normal

Dear Maintainer,

convert changes the contrast (or curve or gamma) of the image significantly
without any reason.

Example command:
convert test.png test2.png

This one results in an image with less amount of grey, midtones are getting
darker.

Example original:
http://mein-neues-blog.de/files/xplanetFX/imagemagick_bug_16_06_13/test.png

Result after the above command:
http://mein-neues-blog.de/files/xplanetFX/imagemagick_bug_16_06_13/test2.png

Compiling e.g. imagemagick 6.7.9 doesn't help because it seems the bug is in
the depending graphics libraries not in the imagemagick binary.

Thanks a lot in advance for taking a look onto this issue.



-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)

Kernel: Linux 3.9-1-686-pae (SMP w/2 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages imagemagick depends on:
ii  hicolor-icon-theme  0.12-1
ii  libbz2-1.0          1.0.6-4
ii  libc6               2.17-5
ii  libfontconfig1      2.9.0-7.1
ii  libfreetype6        2.4.9-1.1
ii  libglib2.0-0        2.36.3-1
ii  libgomp1            4.8.1-2
ii  libice6             2:1.0.8-2
ii  libjpeg8            8d-1
ii  liblcms2-2          2.2+git20110628-2.2
ii  liblqr-1-0          0.4.1-2
ii  libltdl7            2.4.2-1.2
ii  liblzma5            5.1.1alpha+20120614-2
ii  libmagickcore5      8:6.7.7.10-5
ii  libmagickwand5      8:6.7.7.10-5
ii  libsm6              2:1.2.1-2
ii  libtiff4            3.9.6-11
ii  libx11-6            2:1.5.0-1+deb7u1
ii  libxext6            2:1.3.1-2+deb7u1
ii  libxt6              1:1.1.3-1+deb7u1
ii  zlib1g              1:1.2.8.dfsg-1

Versions of packages imagemagick recommends:
ii  ghostscript           9.05~dfsg-6.3
ii  libmagickcore5-extra  8:6.7.7.10-5
ii  netpbm                2:10.0-15+b1
ii  ufraw-batch           0.18-2

Versions of packages imagemagick suggests:
pn  autotrace         <none>
ii  cups-bsd [lpr]    1.6.2-8
ii  curl              7.30.0-2
pn  enscript          <none>
ii  ffmpeg            6:0.8.7-1
ii  gimp              2.8.4-1
ii  gnuplot           4.6.3-2
pn  grads             <none>
ii  groff-base        1.22.2-3
pn  hp2xx             <none>
pn  html2ps           <none>
pn  imagemagick-doc   <none>
ii  libwmf-bin        0.2.8.4-10.3
pn  mplayer           <none>
pn  povray            <none>
pn  radiance          <none>
ii  sane-utils        1.0.22-7.4
pn  texlive-base-bin  <none>
pn  transfig          <none>
ii  xdg-utils         1.1.0~rc1+git20111210-7

-- no debconf information