graphicsmagick ソースパッケージをダウンロード:
GraphicsMagick provides a set of command-line applications to manipulate image files. It is a fork of the ImageMagick project and therefore offers a similar set of features, but puts a larger emphasis on stability.
With this package installed, the GraphicsMagick command line tools can be executed like their ImageMagick counterparts. It allows to migrate scripts from ImageMagick to GraphicsMagick without any code changes.