Jukka Rahkonen <jukka.rahkonen <at> mmmtike.fi> writes: > I wonder also why the the example about using png images as symbols in the > document http://www.gdal.org/ogr/drv_pdf.html includes settings for the > symbol > color. OGR_STYLE in the example is SYMBOL(c:#000000,id:"a_symbol.png"). Does > some of the supported image formats really support changing colors on-the-fly?
I can tell now that color can be used for adjusting transparency if alpha channel is included too. The example it not the best possible because SYMBOL(c:#000000,id:"a_symbol.png") means the same as plain SYMBOL(id:"a_symbol.png") and resulting symbol will be 50% opaque. Perhaps the example could be edited a bit: Alpha channel value controls the opacity/transparency SYMBOL(c:#000000FF,id:"a_symbol.png") makes 100% opaque symbol -Jukka- _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
