I had to add:
FORMATOPTION "TRANSPARENT=ON"
into OUTPUTFORMAT definition.

brgds
Janeks

On 2011.11.03. 16:00, thomas bonfort wrote:
Either your asp page is selecting the wrong (i.e. a non-transparent)
imagetype, or you have a layer that is drawn ontop of the transparent
background, thus making the final image non transparent. The
outputformat you have shown is correct and produces trasnparent
images.

--
thomas

On Thu, Nov 3, 2011 at 14:46, Janeks Kamerovskis
<[email protected]>  wrote:
Hi,

I recently moved to 6.0.1, but stumped to getting transparent image.

I used following syntaxis in my map file:

    IMAGECOLOR 255 255 255

    OUTPUTFORMAT
        NAME "png"
        DRIVER AGG/PNG
        MIMETYPE "image/png"
        IMAGEMODE RGBA
        EXTENSION "png"
        FORMATOPTION "GAMMA=0.75"
        TRANSPARENT ON
    END

    IMAGETYPE png

But my request is still getting nontransparent image:
http://10.162.129.14/MapApp/wms_rs.asp?LAYERS=rs&TRANSPARENT=true&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG%3A25884&BBOX=166509.5,6040766.7857144,908910.5,6571053.2142856&WIDTH=1050&HEIGHT=750

What could be wrong?

brgds&  thanks in advance
Janeks
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