This extension works best with GraphicsMagick
version 1.4+ and PHP 5.1.3+. Gmagick should work with earlier
versions up to GraphicsMagick 1.2.6 but some features and formats
are not supported for these versions. Windows version of
GraphicsMagick is available from the GraphicsMagick website. To
read about the difference between ImageMagick and GraphicsMagick,
check this out: » FAQ .