I think I accidently did install 2 ImageMagicks to my CentOS 5.8 before.
Version 6.2.8 was removed by
yum erase ImageMagick
However, it still shows this when I typed
Version: ImageMagick 6.8.2-9 2013-02-11 Q16 http://www.imagemagick.org Copyright: Copyright (C) 1999-2013 ImageMagick Studio LLC Features: DPC OpenMP Delegates: jng jpeg png ps xml zlib
which convert shows this
This one. I probably installed from the source.
How can I remove this?