[mapserver-users] Re: AGG OUTPUTFORMAT Question

[thomas bonfort]

Steve,
 you have the undocumented FORMATOPTION QUANTIZE_NEW=yes that uses the
median cut quantization algorithm which is slower but much better than
the GD one. Still no guarantee your tiles will have exactly the same
colors, although in practice this seems to be the case.

keep me in touch with your findings, so this can be documented if the
results are ok.

cheers,
thomas

On Wed, Dec 17, 2008 at 20:38, Stephen Woodbridge
<woodbri at swoodbridge.com> wrote:
> Hi Thomas, et al,
>
> I need to generate tiles using AGG output and need them to be 8 bit png
> images.
>
> http://mapserver.gis.umn.edu/docs/howto/agg-rendering-specifics
>
> Does not make it clear if any of the formats shown are 8 bit png images and
> it does not note the use of:
>
>    FORMATOPTION "PALETTE_FORCE=TRUE"
>    FORMATOPTION "PALETTE=/u/data/maps/palette-agg.txt"
>
> What is the proper way to set up OUTPUTFORMAT to use AGG to get the best
> quality 8 bit output. I think I need to use the PALETTE* options to control
> color shifts in adjacent tiles.
>
> I would be happy to add a comment to the above link with this additional
> info.
>
> Best regards,
>  -Steve W
>