[mapserver-users] RGBA transparent images?

[Stephen Woodbridge]

If I want to generate RGBA transparent images using AGG, what should my 
OUTPUTFORMAT block look like?

I was using this one for 8-bit images, but the anti aliasing was 
creating blackish artifacts along the rendered lines. Is there a way to 
avoid them?

  OUTPUTFORMAT
    NAME "agg_qn"
    DRIVER "AGG/PNG"
    EXTENSION "png"
    MIMETYPE "image/png"
    IMAGEMODE RGBA
    TRANSPARENT ON
    FORMATOPTION "INTERLACE=false"
    FORMATOPTION "QUANTIZE_NEW=ON"
    FORMATOPTION "QUANTIZE_FORCE=ON"
    FORMATOPTION "QUANTIZE_DITHER=OFF"
    FORMATOPTION "QUANTIZE_COLORS=37"
    FORMATOPTION "TRANSPARENT=ON"
  END

Trying 32bit RGBA:

  IMAGECOLOR 0 0 0

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

Generated black backgrounds and not transparent. Is it as simple as 
removing the IMAGECOLOR? I didn't try that.

-Steve W
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