Oops, there is no installation script for the ImageMagick binaries (I must have been thinking about something else). It's just a tar of the binaries. Normally, you would:
# cd /usr
# tar -xvzf /var/tmp/ImageMagick-i686-pc-linux-gnu.tar.gz
You can create a temporary work directory, tar there, and test out the binaries before installing it into /usr. Sorry about the misinformation.
