I installed ImageMagick on CentOS 6.3 using yum.

yum -y install libjpeg-devel libpng-devel
yum -y install ImageMagick ImageMagick-devel

Check the version and path of identify and convert to confirm the installation.

# identify -version
Version: ImageMagick 6.5.4-7 2012-05-07 Q16 OpenMP http://www.imagemagick.org
Copyright: Copyright (C) 1999-2009 ImageMagick Studio LLC

# which identify
/usr/bin/identify

# convert -version
Version: ImageMagick 6.5.4-7 2012-05-07 Q16 OpenMP http://www.imagemagick.org
Copyright: Copyright (C) 1999-2009 ImageMagick Studio LLC

# which convert
/usr/bin/convert

For CentOS 5 systems and similar, it seems better to install from source files.

That’s all from the Gemba.