Thanks Daniel, I am not calling layer.draw(), just map.draw().
David. -----Original Message----- From: Daniel Morissette [mailto:[EMAIL PROTECTED] Sent: Wednesday, September 24, 2008 8:45 AM To: Fawcett, David Cc: [email protected] Subject: Re: [mapserver-users] transparent pixmaps in python mapscripts David, TRANSPARENCY ALPHA works only between layers drawn using map.draw() in a single pass. If you call layer.draw() for each layer in a loop in your script then TRANSPARENCY ALPHA has no effect and that could explain the problem you are encountering. Daniel Fawcett, David wrote: > I am using a pixmap symbol to mark a point using Python MapScript v. > 5.2. > > The image has a transparent background. When I use the symbol with > MapServer CGI, I the transparency works. When I use the symbol in > MapScript, I get a black background for the symbol, no transparency. > > Here is how I am creating the symbol: > > img = mapscript.imageObj(/symbols/redcross.png', 'GD/PNG') > > # create the symbol using the image > symbol = mapscript.symbolObj('from_img') > symbol.type = mapscript.MS_SYMBOL_PIXMAP > symbol.setImage(img) > symbol_index = mymap.symbolset.appendSymbol(symbol) > > I also tried to add this to the layer, but it made no difference > either: inline_layer.transparency = mapscript.MS_GD_ALPHA > > Here is a gdalinfo report on the symbol image: > > Driver: PNG/Portable Network Graphics > Files: redcross.png > Size is 32, 32 > Coordinate System is `' > Image Structure Metadata: > INTERLEAVE=PIXEL > Corner Coordinates: > Upper Left ( 0.0, 0.0) > Lower Left ( 0.0, 32.0) > Upper Right ( 32.0, 0.0) > Lower Right ( 32.0, 32.0) > Center ( 16.0, 16.0) > Band 1 Block=32x1 Type=Byte, ColorInterp=Red > Mask Flags: PER_DATASET ALPHA > Band 2 Block=32x1 Type=Byte, ColorInterp=Green > Mask Flags: PER_DATASET ALPHA > Band 3 Block=32x1 Type=Byte, ColorInterp=Blue > Mask Flags: PER_DATASET ALPHA > Band 4 Block=32x1 Type=Byte, ColorInterp=Alpha > > Any ideas on how to get a pixmap symbol with a transparent background > using python mapscript? > > Thanks, > > David. > > > > > > ---------------------------------------------------------------------- > -- > > _______________________________________________ > mapserver-users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/mapserver-users -- Daniel Morissette http://www.mapgears.com/ _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
