[mapserver-users] AGG renderer and paletted RGBA PNG's
thomas bonfort
thomas.bonfort at gmail.com
Mon Dec 8 22:16:51 PST 2008
mapserver version, mapfile, screenshots?
--
thomas
On Mon, Dec 8, 2008 at 23:46, Roger André <randre at gmail.com> wrote:
> Hi All,
>
> I'm seeing a problem in some of my raster data which have graduated color
> ramps in them. When using the AGG renderer, the data appears to have
> discreet colors (which is incorrect), whereas with the GD renderer, we get
> correct color gradients.
>
> The GD outputformat looks like this:
>
> OUTPUTFORMAT
> NAME 'png'
> DRIVER GD/PNG
> IMAGEMODE RGBA
> EXTENSION "png"
> FORMATOPTION "TRANSPARENT=ON"
> FORMATOPTION "INTERLACE=OFF"
> TRANSPARENT ON
> END #end outputformat
>
>
> The AGG outputformat looks like this:
>
> OUTPUTFORMAT
> NAME 'AGGA'
> DRIVER AGG/PNG
> IMAGEMODE RGBA
> EXTENSION "png"
> MIMETYPE "image/png; mode=24bit"
> FORMATOPTION "TRANSPARENT=ON"
> FORMATOPTION "INTERLACE=OFF"
> END
>
> In addition, the output image appears to have a color palette, instead of
> being a 4-ch png. Finally, the problem is present in WMS requests, but not
> straight MODE=map requests.
>
> My WMS request looks like this:
> http://localhost/cgi-bin/mapserv?map=/var/www/mapfiles/hydro/hydro.map&SERVICE=WMS&version=%221.1.1%22&REQUEST=GetMap&LAYERS=imagery&STYLES=&BBOX=-125,39,-108,54&WIDTH=600&HEIGHT=600&FORMAT=png&SRS=epsg:4326
>
> Any ideas?
>
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>
>
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