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

[Roger André]

Hey guys,

Have a try resetting your OUTPUTFORMAT to this:

  OUTPUTFORMAT
    NAME 'AGGA'
    DRIVER AGG/PNG
    MIMETYPE "image/png"
    IMAGEMODE RGBA
    EXTENSION "png"
    FORMATOPTION "INTERLACE=OFF"
  END

Transparency works for me with this.
--

On Wed, Feb 4, 2009 at 11:05 AM, Mike Dunham-Wilkie <mike at barrodale.com>wrote:

>
> 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
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>
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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
> Email: mike at barrodale.com
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