Ben, I think there probably is a bug in the case of GD output with 24 bit icons on a transparent background. If you have the agg driver configured, setting TRANSPARENT TRUE in the map and using the built-in aggpng24 outputformat works.
If you want the result to be 8-bits deep, you could try enabling --with-experimental-png. See http://trac.osgeo.org/mapserver/ticket/2436 for some background. zak -- Zak James Applications and Software Development DM Solutions Group Inc. http://www.dmsolutions.ca On Thu, Jun 26, 2008 at 2:58 PM, Ben Brehmer <[EMAIL PROTECTED]> wrote: > Thanks Paul, > > Unfortunately no luck. Setting "transparency alpha" makes the transparent > part around the symbols completely white :) > > It seems to be the exact same problem as Jim Clack encountered [1], who > never found a solution either. Makes me think its actually a bug and not > intended behavior. Perhaps I'll start digging through the code. > > Cheers, > > Ben > > [1] > http://www.mail-archive.com/[email protected]/msg00569.html > > > Paul Spencer wrote: >> >> just a guess, try transparency alpha >> >> Cheers >> >> Paul >> >> On 25-Jun-08, at 7:33 PM, Ben Brehmer wrote: >> >>> I have a very simple mapfile to display a bunch of points as PNG symbols. >>> >>> Problem is that the transparent part of the symbols are clobbering each >>> other with the background color (see attached image). What I would like to >>> see is a whole wack of merged together symbols when they are overlapping >>> without the background color coming through. >>> >>> Any thoughts as to what could be causing this? >>> >>> Cheers, >>> >>> Ben Brehmer >>> >>> >>> >>> -------------------------------------------------------- >>> >>> The relevant parts of my very simple map file: >>> >>> MAP >>> >>> TRANSPARENT ON >>> >>> OUTPUTFORMAT >>> NAME PNG24 >>> DRIVER "GD/PNG" >>> MIMETYPE "image/png" >>> EXTENSION "png" >>> IMAGEMODE RGBA >>> TRANSPARENT ON >>> END >>> >>> LAYER >>> TRANSPARENCY 100 >>> CLASS >>> STYLE >>> SYMBOL "../../htdocs/images/markers/multi_arrow.png" >>> SIZE 32 >>> END #STYLE >>> END #CLASS >>> .... >>> .. >>> . >>> >>> >>> <transparent_symbol_issue.jpg>_______________________________________________ >>> mapserver-users mailing list >>> [email protected] >>> http://lists.osgeo.org/mailman/listinfo/mapserver-users >> >> >> __________________________________________ >> >> Paul Spencer >> Chief Technology Officer >> DM Solutions Group Inc >> http://www.dmsolutions.ca/ >> > > _______________________________________________ > mapserver-users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/mapserver-users > _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
