[Cartoweb-users] Transparency in a PNG24 outputformat

[Valerio Noti]

Hello,
Is it possible to get transparency in a PNG24 outputformat? 
I'm trying to display a 24bit ecw image in my cartoweb application (3.2.0) with vector layers in transparency over the image.
I cannot output the transparency with following mapfile (points and polygons 
hide the image)
...
IMAGETYPE PNG24
...
OUTPUTFORMAT
    NAME PNG24
    DRIVER "GD/PNG"
    MIMETYPE "image/png"
    EXTENSION PNG
    FORMATOPTION "INTERLACE=OFF"
    IMAGEMODE RGBA
   TRANSPARENT ON
 END
...
LAYER
   NAME "msMont" #mare
   DATA "elba.ecw"
   TYPE RASTER
END
....
The behaviour doesn't change if I set:
"force_imagetype" "jpeg"

in raster metadata

**********************************

If I set normal png outputformat, I get transparency but image quality reduced 
to 8 bit:

OUTPUTFORMAT
   NAME png
  DRIVER "GD/PNG"
   MIMETYPE "image/png"
   IMAGEMODE PC256
   EXTENSION "png"
  FORMATOPTION "INTERLACE=OFF"
   TRANSPARENT ON
 END

************************************


Thanks for any help

Valerio





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