These options are directly given to the class Image_Text which handles text-output. For a full list of necessary/available font-options please refer to the Image_Text-docs and/or have a look at the examples shipped with the Image_Graph-package. !! Note that the option "font_type" defaults to "ttf" (TrueType-fonts) at the moment. As soon as PHP-internal (bitmap) fonts are also supported by Image_Text this will default to those internal fonts instead. !!