[mapserver-users] Using IMAGECOLOR to create a transparency mask

[Mike Dunham-Wilkie]

Sorry Glenn, I don't have an answer, but I've been dealing with the 
same problem.

Transparency seems to work as expected with:

OUTPUTFORMAT
   NAME png24
   DRIVER "GD/PNG"
   MIMETYPE "image/png"
   IMAGEMODE RGBA
   EXTENSION "png"
   TRANSPARENT ON
END

but not with:

OUTPUTFORMAT
   NAME 'AGG'
   DRIVER AGG/PNG
   IMAGEMODE RGBA
   FORMATOPTION "PALETTE_FORCE=TRUE"
   FORMATOPTION "PALETTE="
   TRANSPARENT ON
END

It's as if with AGG/PNG the TRANSPARENT ON setting is completely ignored.

Mike


At 10:52 AM 04/02/2009, gwaldron wrote:


>I'm trying to use IMAGECOLOR to try to force all pixels of a certain color to
>become fully transparent, but I am not having any luck getting it to work.
>
>My output format it AGG/PNG, RGBA, TRANSPARENT ON.
>
>I have a shapefile layer set to COLOR 0 50 100, and my map-level IMAGECOLOR
>set to the same. I was hoping all the polys in the shapefile would render as
>transparent pixels, but no luck; they just show up as blue polygons.
>
>What am I doing wrong here? Thanks.
>
>-----
>Glenn Waldron * Pelican Mapping * gwaldron at pelicanmapping.com * +1 703 652
>4791
>--
>View this message in context: 
>http://n2.nabble.com/Using-IMAGECOLOR-to-create-a-transparency-mask-tp2270688p2270688.html
>Sent from the Mapserver - User mailing list archive at Nabble.com.
>
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----------------------------------------------
Michael Dunham-Wilkie, M.Sc., M.P.A.
Senior Database Analyst
Barrodale Computing Services Ltd.
Tel: (250) 472-4372 Fax: (250) 472-4373
Web: <http://www.barrodale.com>http://www.barrodale.com
Email: mike at barrodale.com
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