Hey, that's what they pay you the BIG BUCKS for! :)
Write a perl/bash/{your favorite} script to grab all the COLOR lines
from you mapfile and reformat the r g b to r,g,b in you palette file.
I have a few hundred symbols in my symbol library, but I only use about
10 of them regularly so I made sure the primary colors were also in the
palette file. I make the script add them so I don't have to think about it.
It sounds like a big deal, but it not that bad.
YMMV,
-Steve W
BrainDrain wrote:
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?)
--
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__________________________________________
Paul Spencer
Chief Technology Officer
DM Solutions Group Inc
http://www.dmsolutions.ca/
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