[mapserver-users] Class level Transparency/Opacity

[Varun saraf]

Hello,

Is it possible to set a transparency rate for the CLASS level Color?
Below is my mapfile. I am using this layer on google maps in tile
mode. When I do so, the base map is getting completely overlapped by
the colored polygons. I need a level of transparency so that the base
map's roads and location are visible. In other words, I only want to
highlight the polygons that match the expression criteria. Can someone
tell me what I need to do for the same? I have already tried putting
in OPACITY field in the layer object but it only lightens the color
without making it transparent. an OPACITY of 1 renders the polygons
"white" in color.

MAP
    NAME drawBothMap
    TRANSPARENT ON
    IMAGETYPE PNG

    PROJECTION
      "init=epsg:4326"
    END

    LAYER
        NAME "USABOTH"
        STATUS DEFAULT
        METADATA
            wms_title "example_layer"
        END
        TYPE polygon
        DATA USA

        CLASSITEM "QCT"

        CLASS
          EXPRESSION '1'
          COLOR 255 0 0
        END

        CLASS
          EXPRESSION '2'
          COLOR 0 255 0
        END

        CLASS
          EXPRESSION '3'
          COLOR 0 0 255
        END
    END
END

Thanks,
Varun
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