Installing ImageMagick with MacPorts couldn’t be easier:
sudo port install ImageMagick
But getting it to work with your PHP installation is a bit harder. If you’ve installed PHP via MacPorts with the pear variant you can install the imagick extension via pecl:
sudo pecl install imagick
The trick to getting it to stop complaining about the Wand-config path, is by passing it the proper prefix for ImageMagick. When prompted, hit 1, then enter in:
/opt/local
Now just add this to the end of your php.ini file, and reboot apache:
[imagemagick]
extension=imagick.so