metaTiling with transparency in PNG8 output tiles ?

[Ludovic]

Hi list,
One question before installing mod-geocache.
My WMS server is configured –with-experimental-png option to produce
PNG8 with alpha transparency.
Will the metaTiling option of mod-geocahe correctly preserve
tranparency in each PNG8 tile?
Thanks for your help.

[thomas bonfort]

mod-geocache has the same quantization algorithm as mapserver with
--enable-experimantal-png.
If you are doing metatiles and want to produce png8 images, you should
set mapserver to produce full rgb images (i.e. with no
quantize_force), and let mod-geocache do the quantization once it has
chopped the metatile into tiles with
<tileset>...<format>png8</format></tileset>

--
thomas

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[Ludovic]

Thanks for your answer.
But i'll be faced with tiles with potentially not exactly the same
colors. Will i be able to define e predifined palette file?

[thomas bonfort]

if you are using mapserver with a fixed palette , you should be fine .
use the "png8" format in mod-geocache, it will keep the colors of the
image that was created in mapserver.

--
thomas

[Ludovic Gnemmi]

Works great. Thanks for your help