[mapserver-dev] png optimization on output

[thomas bonfort]

+1 for this functionality
libpng supports different levels of compression, so it might be nice
to expose those to the formatoption values instead of just TRUE/FALSE

--
thomas

On Tue, Feb 9, 2010 at 22:43, Stephen Woodbridge
<woodbri at swoodbridge.com> wrote:
> Thomas, Steve L, Assefa,
>
> Do we have an option to optimize png images for size on output?
> I'm using an output format like:
>
>  OUTPUTFORMAT
>    NAME "agg_qn"
>    DRIVER "AGG/PNG"
>    EXTENSION "png"
>    MIMETYPE "image/png"
>    IMAGEMODE RGB
>    FORMATOPTION "INTERLACE=false"
>    FORMATOPTION "QUANTIZE_NEW=ON"
>    FORMATOPTION "QUANTIZE_DITHER=OFF"
>    FORMATOPTION "QUANTIZE_COLORS=256"
>  END
>
> If Iuse pngcrush -reduce on the resulting file I get about 25%  reduction in
> size. it seems like it might be worthwhile to add code that does the same
> sort of thing maybe triggered by something like:
>
>    FORMATOPTION "REDUCE=true"
>
> I realize that this is costs additional time, but when using mapserver with
> something like Assefa's tilecache patch where you are actually drawing
> metatiles and chopping them into a cache, the trade off between time and
> size can be justified.
>
> I can write up a bug if people think this would be a good option.
>
> Thanks,
>  -Steve W
>
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