Steve,
I use this OUTPUTFORMAT
OUTPUTFORMAT
NAME png
MIMETYPE "image/png"
DRIVER "AGG/PNG"
EXTENSION "png"
IMAGEMODE "RGB"
FORMATOPTION "PALETTE_FORCE=TRUE"
FORMATOPTION "PALETTE=/path/to/palette.txt"
END
We've had good results with this in terms of colours - once you
identify the main colours you want to keep from the map file and any
images in your palette.txt file, GD seems to do a pretty reasonable
job of filling in the antialiasing colours
I'm not sure the extra quality that Thomas mentioned would be
noticeable, but I haven't tried it. I think that it might be worth
running pngnq on tiles as well - not to reduce the palette but to
reduce the tile size, but I'm not sure on that.
Cheers
Paul
On 17-Dec-08, at 2:38 PM, Stephen Woodbridge 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
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__________________________________________
Paul Spencer
Chief Technology Officer
DM Solutions Group Inc
http://research.dmsolutions.ca/
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