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GraphicsMagick: Difference between revisions
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The most common problem is the following warning when using {{Codeline|imread()}}: | The most common problem is the following warning when using {{Codeline|imread()}}: | ||
<pre>warning: your version of GraphicsMagick limits images to 8 bits per pixel</pre> | <pre>warning: your version of GraphicsMagick limits images to 8 bits per pixel</pre> | ||
The reason for this is that GraphicsMagick was compiled with {{Codeline|--with-quantum-depth 8}}. Possible values are 8, 16 or 32, each implementing that limitation. See the {{Path|INSTALL}} [http://graphicsmagick.hg.sourceforge.net/hgweb/graphicsmagick/graphicsmagick/file/tip/INSTALL-unix.txt#l429 file] on GraphicsMagick sourcefor an explanantion of this. There | The reason for this is that GraphicsMagick was compiled with {{Codeline|--with-quantum-depth 8}}. Possible values are 8, 16 or 32, each implementing that limitation. See the {{Path|INSTALL}} [http://graphicsmagick.hg.sourceforge.net/hgweb/graphicsmagick/graphicsmagick/file/tip/INSTALL-unix.txt#l429 file] on GraphicsMagick sourcefor an explanantion of this. There are bugs reported requesting package maintainers to compile it with higher values. You should not create a new bug, instead leave a comment on the already open bugs: [http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=557879 Debian], [https://bugs.launchpad.net/ubuntu/+source/graphicsmagick/+bug/696215 Ubuntu], [https://bugzilla.redhat.com/show_bug.cgi?id=996411 Fedora]. | ||
As versions with higher values are not available on the repositories, the solution is to compile it. Octave needs then to be recompiled to use the freshly compiled Magick++ library. | As versions with higher values are not available on the repositories, the solution is to compile it. Octave needs then to be recompiled to use the freshly compiled Magick++ library. | ||