[mapserver-users] PNG symbol transparency supported in map MODE?

[Manuel Aymerich]

Just in case this thread is followed by someone facing the same problem.

 

The icon transparency issue is solved inserting TRANSPARENCY ALPHA on each
mapfile layer.

 

Manuel

 

De: Manuel Aymerich [mailto:maymerich at argongra.es] 
Enviado el: lunes, 15 de noviembre de 2010 17:54
Para: 'Gracia Fernández López'
Asunto: RE: [mapserver-users] PNG symbol transparency supported in map MODE?

 

Thanks for your tip Gracia. However using WMS to retrieve a single and
untiled image to insert on a pdf doesn’t seem like a good idea to me. I
would have to handle each tile separately, and that should be horribly
tedious. Even more, the area bounds would be delimited by these frontier
tiles and not the exact area the user desires. It is a server side process
not a service.

 

 On the other hand, I don’t think the issue has to do anything with the
OUTPUTFORMAT transparency. My images are transparent pngs. However to
produce this transparent images, mapserver merges the symbols layer together
with all the other layers but  without considering the symbols transparency
(in mode=map of course).

 

Regards and again thanks for your time and effort,

 

Manuel

 

De: Gracia Fernández López [mailto:graciafdez at gmail.com] 
Enviado el: lunes, 15 de noviembre de 2010 9:56
Para: Manuel Aymerich
CC: mapserver-users at lists.osgeo.org
Asunto: Re: [mapserver-users] PNG symbol transparency supported in map MODE?

 

Hello Manuel,

I am not an expert with MapServer, but I can suggest you to do all the
queries in WMS mode (or other OGC query), because it is a standard and it
already works to you.

Taking a look to my MapServer configuration, I have the following:

  OUTPUTFORMAT
    NAME gif
    ...
    TRANSPARENT ON
  END

I hope this can help you.

--
Regards
Gracia

2010/11/12 Manuel Aymerich <maymerich at argongra.es>

Hi,

 

I am working with mapserver to provide a wms service in which users can
select a map area and get a pdf print as an output. On one my vector layers,
I’ve inserted some new png symbols with an alpha channel. Everything works
great in the WMS mode, transparency for those symbols is supported.
However, when the users wants to get the pdf of an area,  I make a mapserver
CGI call in MODE=MAP to retrieve the map area as a single image an construct
the pdf output on the fly. In this MODE=MAP case, transparency for those
symbols is not supported.

 

Here is a visual example of the problem I am facing, so that you can all
judge it  yourselves:

+ WMS mode <http://labs.argongra.com/demo/WMSmode.png>  (transparency for
symbols supported).

+ Map mode <http://labs.argongra.com/demo/MAPmode.png>  (symbols
transparency).

 

It seems that when mapserver merges all layers into one in map mode to
obtain a single output image, symbol features are rendered without
transparency support.

 

At the layer level I’ve set  << OPACITY alpha >>, but the problem persists.
Any clue of want I might be missing? Is this a mapserver bug?

 

Any help or hint will be appreciated. Thanks in advanced, regards,

 

Manuel Aymerich

 

 

 


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