[mapserver-users] transparecy for colored polygons

[Eichner, Andreas - SID]

> i want to set transparency for colored polygons iam displaying a polygon
> layer on the google image and i want to set transparency so that
> background image has to visible in the colored polygons

You should apply OPACITY at STYLE or LAYER.
http://mapserver.org/mapfile/style.html#index-37 
http://mapserver.org/mapfile/layer.html#opacity