AGG renderer in conjunction with WMS TRANSPARENT=true parameter

[Travis Kirstine]

Sorry Pal I  have no advice just a comment.  We were considering
upgrading to ms 5.0 with agg but never did do to the statment on the
mapserver site "The AGG driver only supports RGB output at this time."
on the Support for Anti-Grain Geometry (AGG) Rendering Engine
documents.

http://mapserver.gis.umn.edu/development/rfc/ms-rfc-32

I guess this in not correct?

Travis












On 17/12/2007, Pål Kristensen <pal.kristensen at statkart.no> wrote:
> Hi!
>
> I'm trying to use the AGG renderer and reduce the resulting 24bits image to
> 8bits by using the quantize method. This works quite well when the WMS
> parameter TRANSPARENT=false, but when set to true the BGCOLOR parameter
> seems to be ignored and the quality of the rendered vectors clearly
> degrades.
>
> When requesting 24bit images the TRANSPARENT parameter works correctly. See
> the examples below:
>
> 24bit png, transparent true -> OK:
> http://159.162.103.7/cgi-bin/NorgeTopo?VERSION=1.1.1&SERVICE=WMS&REQUEST=GetMap&SRS=EPSG:32633&BBOX=62423.20,6794915.15,66383.94,6797147.88&LAYERS=Hoydekurver&STYLES=&WIDTH=926&HEIGHT=522&FORMAT=image/png;%20mode=24bit&BGCOLOR=0xffffff&TRANSPARENT=true
>
> 24bit png, transparent false -> OK:
> http://159.162.103.7/cgi-bin/NorgeTopo?VERSION=1.1.1&SERVICE=WMS&REQUEST=GetMap&SRS=EPSG:32633&BBOX=62423.20,6794915.15,66383.94,6797147.88&LAYERS=Hoydekurver&STYLES=&WIDTH=926&HEIGHT=522&FORMAT=image/png;%20mode=24bit&BGCOLOR=0xffffff&TRANSPARENT=false
>
> 8bit png, transparent false -> OK:
> http://159.162.103.7/cgi-bin/NorgeTopo?VERSION=1.1.1&SERVICE=WMS&REQUEST=GetMap&SRS=EPSG:32633&BBOX=62423.20,6794915.15,66383.94,6797147.88&LAYERS=Hoydekurver&STYLES=&WIDTH=926&HEIGHT=522&FORMAT=image/png&BGCOLOR=0xffffff&TRANSPARENT=false
>
> 8bit png, transparent true -> NOT OK:
> http://159.162.103.7/cgi-bin/NorgeTopo?VERSION=1.1.1&SERVICE=WMS&REQUEST=GetMap&SRS=EPSG:32633&BBOX=62423.20,6794915.15,66383.94,6797147.88&LAYERS=Hoydekurver&STYLES=&WIDTH=926&HEIGHT=522&FORMAT=image/png&BGCOLOR=0xffffff&TRANSPARENT=true
>
> This is the output formats from the mapfile:
> ...
>   OUTPUTFORMAT
>      NAME "png8bit"
>      DRIVER "AGG/PNG"
>      MIMETYPE "image/png"
>      EXTENSION "png"
>      FORMATOPTION "QUANTIZE_FORCE=ON"
>      FORMATOPTION "QUANTIZE_COLORS=256"
>      FORMATOPTION INTERLACE=OFF
>   END
>
>   OUTPUTFORMAT
>      NAME "png24bit"
>      DRIVER "AGG/PNG"
>      MIMETYPE "image/png; mode=24bit"
>      EXTENSION "png"
>      IMAGEMODE "RGB"
>      FORMATOPTION INTERLACE=OFF
>   END
>
>   OUTPUTFORMAT
>      NAME "jpeg24"
>      DRIVER "AGG/JPEG"
>      MIMETYPE "image/jpeg"
>      EXTENSION "jpg"
>      FORMATOPTION "QUALITY=60"
>   END
> ...
>
> Regards,
> Pål Kristensen
> --
> View this message in context: http://www.nabble.com/AGG-renderer-in-conjunction-with-WMS-TRANSPARENT%3Dtrue-parameter-tp14370293p14370293.html
> Sent from the Mapserver - User mailing list archive at Nabble.com.
>


-- 
Travis K.

Toronto, Canada
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