Returns the "image/gif" mime type since that is the only output format
this producer specializes on.
"image/gif" throws: IllegalStateException - if super.getLegendGraphic() ==null, to respect the workflow. See Also: org.vfny.geoserver.wms.responses.GetLegendGraphicProducer.getContentType
Encodes on the fly the image generated on
to out in "image/gif" format.
See Also: org.vfny.geoserver.wms.responses.GetLegendGraphicProducer.writeTo(java.io.OutputStream)
Fields inherited from org.vfny.geoserver.wms.responses.DefaultRasterLegendProducer