2010/12/10 Cédric MOULLET <cedric.moul...@gmail.com>:
> Hi,
> We are using MapServer to generate tiles and the following ouptut format is
> used:
>
> OUTPUTFORMAT
> NAME "pnga"
> MIMETYPE "image/pnga"
> DRIVER "AGG/PNG"
> EXTENSION "png"
> IMAGEMODE "RGBA"
> TRANSPARENT TRUE
> FORMATOPTION "INTERLACE=OFF"
> END
>
> We observe that the size of the tiles can be reduced by a at least factor 2
> if we use a tool like optipng.
> Is it possible to configure MapServer in order to optimize the file output
> (and for example use optipng) ? Or do you see another way to optimize the
> image (I'd like to do that on the MapServer side in order to avoid a
> postprocessing) ?
> Thanks in advance for any hints.
> Cédric
Hi Cedric,
when You compile Your Mapserver with "–with-experimental-png" option
You can have very nice quantized PNG images, which can be much more
smaller. We are using this option for all our projects for few years
now.
Configuration example:
IMAGETYPE 'AGG_PNG'
OUTPUTFORMAT
NAME 'AGG_PNG'
DRIVER 'AGG/PNG'
MIMETYPE 'image/png'
IMAGEMODE RGBA
FORMATOPTION 'QUANTIZE_FORCE=ON'
FORMATOPTION 'QUANTIZE_DITHER=OFF'
FORMATOPTION 'QUANTIZE_COLORS=256'
FORMATOPTION 'INTERLACE=OFF'
EXTENSION 'png'
END
More here: http://mapserver.org/mapfile/outputformat.html
Ivan
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