Transparency in WMS

[Daniel Morissette]

Jacolin Yves wrote:
> Hi list,
> 
> I am using mapserver to provide a wms service. I would like to set a 
> transparency value for a layer to 50. The final map provided don't use the 
> right opacity for this layer. This layer is always 100% opaque.
> 
> Is it possible to change the transparency for a layer using WMS?
> 

The transparency (or opacity on 5.0) setting applies only between layers 
within a given map draw, but the resulting map image is always opaque 
(unless you pass TRANSPARENT=TRUE in a GetMap request, in which case 
only the background color is transparent).

If you have a mapfile with multiple CONNECTIONTYPE WMS layers then 
setting transparency/opacity between those layers should work.

If you are using MapServer as a WMS service and expecting the 
transparency/opacity of a given layer to result in a 50% opaque GetMap 
response then that won't work.

Daniel
-- 
Daniel Morissette
http://www.mapgears.com/