[Mapserver-users] Mapserver 4.0 as WMS server issuing transparent PNG

Fri Sep 26 07:26:35 PDT 2003

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Hi list,

Today I've (finally) migrated to Mapserver 4.0, and needed to migrate =
several locally cascaded WMS services too. All but one of these are used =
to generate backdrops, i.e. not transparent, but a single service is =
used to publish thematic layers to be shown on top of other layers. So =
this service needs to issue transparent map images, and therefore I'm =
using PNG.

However, only the surrounding area is transparent, not the interior of =
the polygons features, even though these are set to 50% transparency. =
What am I doing wrong ?

It worked in Mapserver 3.6.3 with 8bit PNG's, and all I've done is add a =
single OUTPUTFORMAT + IMAGETYPE clause to the MAP file used by the =
service (set to 24bit PNG with RGBA). The layers/data it reads are all =
locally saved MapInfo TAB tables.

Best regards / Med venlig hilsen
Lars V. Nielsen
--------------------------------------------------------
Hvenegaard & Meklenborg
Rugaardsvej 55, DK-5000 Odense C
Denmark
http://www.hvm.dk
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<DIV><FONT face=3DArial size=3D2>Hi list,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Today I've (finally) migrated to =
Mapserver 4.0, and=20
needed to migrate several locally cascaded WMS services too. All but one =
of=20
these are used to generate backdrops, i.e. not transparent, but a single =
service=20
is used to publish thematic layers to be shown on top of other layers. =
So this=20
service needs to issue transparent map images, and therefore I'm using=20
PNG.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>However, only the surrounding area is =
transparent,=20
not the interior of the polygons features, even though these are =
set to 50%=20
transparency. What am I doing wrong ?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>It worked in Mapserver 3.6.3 with 8bit =
PNG's, and=20
all I've done is add a single OUTPUTFORMAT + IMAGETYPE clause to the MAP =
file=20
used by the service (set to 24bit PNG with RGBA). The layers/data it =
reads are=20
all locally saved MapInfo TAB tables.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Best regards / Med venlig =
hilsen<BR>Lars V.=20
Nielsen<BR>--------------------------------------------------------<BR>Hv=
enegaard=20
& Meklenborg<BR>Rugaardsvej 55, DK-5000 Odense C<BR>Denmark<BR><A=20
href=3D"http://www.hvm.dk">http://www.hvm.dk</A></FONT></DIV></BODY></HTM=
L>

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