If you have tried to run (install) Imagemagick on ZenWalk 6.2 (possibly on other distros too) you might have run into problems with libfftw3.so.3 such as:
$ convert
convert: error while loading shared libraries: libfftw3.so.3: cannot open shared object file: No such file or directory
In order to fix this error simply install fftw (with netpkg presumably):
Successfully installed:
fftw-3.2.2-i686-62.1.txz
After that convert (one of Imagemagick binaries) will work perfectly fine:
$ convert --version
Version: ImageMagick 6.5.4-9 2009-08-09 Q16 OpenMP http://www.imagemagick.org
Copyright: Copyright (C) 1999-2009 ImageMagick Studio LLC