just a side note on the subject: seeding your tiles probably involves using tilecache's metatiles. quantizing a 5x5 tile in mapserver will very probably give poorer visual results than quantizing each individual tile. For this reason I tend to seed in 24bit mode, and postprocess the split up tiles with pngnq:
for file in `find tilecache/mylayer -name "*.png"`; do echo $file; pngnq -e .png.tmp -n 256 $file; mv $file.tmp $file; done On Wed, Dec 17, 2008 at 20:56, thomas bonfort <[email protected]> wrote: > 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 > <[email protected]> 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 >> > _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
