[mapserver-users] Transparency of overlapping PNG-symbols

[Lime, Steve D (DNR)]

Can you share the batnight.png file? Any difference if you remove "TRANSPARENT 0"? It shouldn't have any
effect since transparency is picked up from the pixmap. By chance does this work ok in 6.0?

Steve

-----Original Message-----
From: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Stephan Holl
Sent: Friday, April 08, 2011 8:43 AM
To: mapserver-users at lists.osgeo.org
Cc: Björn Schilberg
Subject: [mapserver-users] Transparency of overlapping PNG-symbols

Dear list,

while developing an application with PNG-symbols rendered on top of a map I have encountered a problem if the PNG-symbols overlap each other; artefacts are present (see attachment).

The Symbols are defined as following:
SYMBOL
  NAME "Batnight"
  TYPE PIXMAP
  IMAGE "./images/batnight.png"
  TRANSPARENT 0
END

Used outputformat:
OUTPUTFORMAT
    NAME agg
    DRIVER AGG/PNG
    IMAGEMODE RGB
END

Is there an easy way to let them disappear or is this a (perhaps known) bug in MapServer?

I am using the AGG-renderer and MS 5.6.6 though.

TIA

	Stephan

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