Thanks, i already read about preparing palette index file & I see 2 obstacles: 1) I need to monitor my map file (big size) to keep relevant my palette file. It is inflexible to extract rgb colors used in pixmap symbols (hundreds, updatable). Can I use html palette for ex. (or any other 'universal' palette) - to make this process not so time-consuming? 2) If I have strict palette, can I be sure that agg renderer will always use the nearest(?) color from my palette?
pagameba wrote: > > Use: > > OUTPUTFORMAT > OUTPUTFORMAT > NAME "AGG_Q" > DRIVER "AGG/PNG" > MIMETYPE "image/png; mode=8bit" > IMAGEMODE RGB > EXTENSION "png" > FORMATOPTION "PALETTE_FORCE=TRUE" > FORMATOPTION "PALETTE=/path/to/palette.txt" > END > > where palette.txt is a text file with RGB tuples in the form: > > RRR,GGG,BBB > > For example: > > 0,0,0 > 255,255,255 > 127,127,127 > > MapServer will use AGG 24 bit rendering but reduce the output file to > 8 bit and reserve the colours in your palette.txt file. This will > give you consistent colours for the ones you care about. > Specifically, you should reserve all the colours that you actually > reference in your map file plus any colours of pixmap symbols. Don't > put in more colours than you actually need to because MapServer needs > to use whatever space is left (255 less your colours) for antialiasing. > > Cheers > > Paul > > On 6-Jun-08, at 7:53 AM, BrainDrain wrote: > >> >> I use this output format in my map file: >> OUTPUTFORMAT >> NAME "AGG_Q" >> DRIVER "AGG/PNG" >> MIMETYPE "image/png; mode=8bit" >> IMAGEMODE RGB >> EXTENSION "png" >> FORMATOPTION "QUANTIZE_FORCE=ON" >> FORMATOPTION "QUANTIZE_DITHER=OFF" >> FORMATOPTION "QUANTIZE_COLORS=256" >> END >> but every time map draw called (or map image requested fom cgi >> mapserv.exe) >> polygons has a little difference in fill color (I think this is >> because >> color palette recalculated slightly different each time). This is >> unacceptable for me. How can i correct this? (maybe some >> FORMATOPTION?) >> -- >> View this message in context: >> http://www.nabble.com/help%21-agg-palette-quantize-algorithm-imperfection-tp17667733p17667733.html >> Sent from the Mapserver - User mailing list archive at Nabble.com. >> >> _______________________________________________ >> mapserver-users mailing list >> [email protected] >> http://lists.osgeo.org/mailman/listinfo/mapserver-users > > > __________________________________________ > > Paul Spencer > Chief Technology Officer > DM Solutions Group Inc > http://www.dmsolutions.ca/ > _______________________________________________ > mapserver-users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/mapserver-users > > -- View this message in context: http://www.nabble.com/help%21-agg-palette-quantize-algorithm-imperfection-tp17667733p17692463.html Sent from the Mapserver - User mailing list archive at Nabble.com. _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
