Le lundi 12 novembre 2012 15:57:09, Jukka Rahkonen a écrit : > 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.
Actually SYMBOL(c:#000000,id:"a_symbol.png") would result in a opaque symbol, whereas SYMBOL(id:"a_symbol.png") would use the default alpha for brush, that's to say 50%. > 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 I've tried to improve the doc about that in r25219. > > > -Jukka- > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
