I am not sure if is it possible to reduce AGG PNG image to 8bit by
"PALETTE_FORCE=TRUE" option and keep transparent background.
I went through all posts about this issue and it is not clear for me if I still
need to compile mapserver with "--with-experimental-png" switch or it is
currently not possible.
I have tested all possible parameters and combinations of RGB or RGBA in
OUTPUTFORMAT and palette file with BLACK BACKGROUND as result.
/usr/lib/cgi-bin/mapserv -v
MapServer version 5.2.1 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP
OUTPUT=SVG SUPPORTS=PROJ SUPPORTS=AGG SUPPORTS=FREETYPE SUPPORTS=ICONV
SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT
SUPPORTS=WCS_SERVER SUPPORTS=FASTCGI SUPPORTS=THREADS SUPPORTS=GEOS INPUT=EPPL7
INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE
I use mapserver as WMS server.
Currently I have this in mapfile:
NTERLACE OFF
TRANSPARENT TRUE
IMAGETYPE AGG8
OUTPUTFORMAT
NAME "AGG8"
DRIVER "AGG/PNG"
MIMETYPE "image/png"
EXTENSION "png"
IMAGEMODE "RGBA" - #(IMAGEMODE "RGB" is working, nice result
without transparent background)
FORMATOPTION INTERLACE=OFF
FORMATOPTION "PALETTE_FORCE=TRUE"
FORMATOPTION "PALETTE=/s/agg_8bit_pal.txt"
END
And palette file:
0,0,0
255,255,255,255
230,230,230,0
174,17,52,255
174,17,52,255
242,221,190,255
Please, can anybody clarify this?
Thanks
Ivan
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