Module types
http://www.graphicsmagick.org/api/types.html
Binding of GraphicsMagick Types.
http://www.graphicsmagick.org/api/types.html#channeltype
http://www.graphicsmagick.org/api/types.html#clippathunits
http://www.graphicsmagick.org/api/types.html#colorspacetype
http://www.graphicsmagick.org/api/types.html#compositeoperator
http://www.graphicsmagick.org/api/types.html#compressiontype
http://www.graphicsmagick.org/api/types.html#decorationtype
DisposeType
http://www.graphicsmagick.org/api/types.html#fillrule
http://www.graphicsmagick.org/api/types.html#filtertypes
http://www.graphicsmagick.org/api/types.html#gravitytype
http://www.graphicsmagick.org/api/types.html#imagetype
http://www.graphicsmagick.org/api/types.html#interlacetype
LineCap
LineJoin
Pixel error metrics
MontageMode
http://www.graphicsmagick.org/api/types.html#noisetype
http://www.graphicsmagick.org/api/types.html#orientationtype
http://www.graphicsmagick.org/api/types.html#paintmethod
PreviewType
http://www.graphicsmagick.org/api/types.html#renderingintent
http://www.graphicsmagick.org/api/types.html#resolutiontype
http://www.graphicsmagick.org/api/types.html#resourcetype
http://www.graphicsmagick.org/api/types.html#storagetype
http://www.graphicsmagick.org/api/types.html#stretchtype
http://www.graphicsmagick.org/api/types.html#styletype
http://www.graphicsmagick.org/api/types.html#virtualpixelmethod