[mapserver-users] RGBA transparent images?

[Wim Vanbelle]

Hi Steve,

I have this in my file:

        OUTPUTFORMAT
                NAME "AGGPNG"
                DRIVER "AGG/PNG"
                EXTENSION "png"
                MIMETYPE "image/png;mode=24bit;"
                IMAGEMODE RGBA
                FORMATOPTION "INTERLACE=true"
                FORMATOPTION "QUANTIZE_NEW=ON"
                FORMATOPTION "QUANTIZE_FORCE=ON"
                FORMATOPTION "QUANTIZE_DITHER=ON"
                FORMATOPTION "QUANTIZE_COLORS=256"
        END

And in my layer, if you want opacity:

                OPACITY 60


That should render nice lines :).





On 24 August 2010 21:16, Stephen Woodbridge <woodbri at swoodbridge.com> wrote:

> 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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