ImageMagick is very useful image processing kit. It has been used by many web servers to speed-up image processing and bandwidth optimization. If you are running Drupal or Gallery2 you can improve the performance of your web site. If your site is hosted by web host provider probably your only need to enable Drupal or Gallery2 to use ImageMagick. If your web site is running on your own server, you might need to install ImageMagick yourself.