[mapserver-users] Transparency via WMS request?

[Roger André]

Ok, this is driving me bonkers.  I have a raster image with nodata values
set to be transparent.  When I make requests to this layer in "mode=map", it
works beautifully, and the nodata values are transparent.

-
http://localhost/cgi-bin/mapserv?map=/var/www/mapfiles/temp/temp.map&mode=map

However, when I try to view the same data via a WMS request, the nodata
values are displayed in black.

- http://localhost/cgi-bin/mapserv?map=/var/www/mapfiles/temp/temp.map
&SERVICE=WMS
&version=%221.1.122
&REQUEST=GetMap
&LAYERS=imagery
&STYLES=
&BBOX=-180,-90,180,90
&WIDTH=600
&HEIGHT=500
&FORMAT=png
&SRS=epsg:4326

I have tried doing a couple of things to fix this, none of which has worked:
- added "wms_transparent"     "TRUE" to METADATA section of LAYER
- added "&TRANSPARENT=TRUE" to the end of the WMS request
- made sure that in OUTPUTFORMAT I have all of these:
  OUTPUTFORMAT
   NAME png
   DRIVER "AGG/PNG"
   MIMETYPE "image/png"
   IMAGEMODE RGBA
   EXTENSION "png"
   FORMATOPTION "TRANSPARENT=ON"
   FORMATOPTION "INTERLACE=OFF"
   TRANSPARENT ON
  END #end outputformat

Please, can anyone tell me what I'm missing?

Thanks,

Roger
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