What you are doing is a "95%" solution. What you are actually missing is
that if you use images in symbols, that these are not covered by the
colors in the mapfile and it is possible that the colors on the symbols
may shift. If you do not see any issue with that then you are probably ok.
-Steve W
Espen Isaksen wrote:
Is this the only way to make it work correctly? It seems a lot easier
to extract all the RGB colors we use from the map file and add that to
the palette file? That is what we have done now, and it will be a lot
more work to actually extract the colors from all the different map
images we then have to create(different colors going from mountain
areas, forest areas down to urban areas).
Espen
2009/11/6 Steve Lime <[email protected]>:
Correct. My palette creation process has been to:
1) create a master image that shows as many possible rendering outputs as
possible as a 24-bit PNG.
2) use a tool to reduce the colors in that image to the desired number and
create a 8-bit file. In my case
I use PhotoShop and produce a gif. Here's a link to the one I used for our rec.
compass app but after
color reduction to 128 colors.
http://maps.dnr.state.mn.us/compass/remove/compass_color_master.gif
3) extract a palette from the 8-bit image. I wrote a little perl script that
processes gdalinfo output.
4) my outputformat block is like so:
OUTPUTFORMAT
NAME png
DRIVER "AGG/PNG"
MIMETYPE "image/png"
IMAGEMODE RGB
EXTENSION "png"
FORMATOPTION "INTERLACE=OFF"
FORMATOPTION "PALETTE_FORCE=TRUE"
FORMATOPTION "PALETTE=/mapserver/compass/compass.palette"
END
I've not had problems with this method...
It's possible there's a bug but it's going to be difficult to fix without a
good test case.
Steve
On 11/6/2009 at 9:52 AM, in message
<[email protected]>, Espen Isaksen
<[email protected]> wrote:
Sorry, this still creates trouble. And you have omitted
FORMATOPTION "PALETTE_FORCE=TRUE"
on this one. That means it does not use the palette file right?
Espen
2009/11/6 Stephen Woodbridge <[email protected]>:
Espen,
Try using this:
OUTPUTFORMAT
NAME agg
DRIVER "AGG/PNG"
MIMETYPE "image/png"
IMAGEMODE RGB
FORMATOPTION "INTERLACE=false"
FORMATOPTION "QUANTIZE_FORCE=ON"
FORMATOPTION "QUANTIZE_DITHER=OFF"
FORMATOPTION "QUANTIZE_COLORS=256"
FORMATOPTION "PALETTE=/data/maps/palette.txt"
END
And see if it does what you want. Also note that I use "ON" and note "TRUE"
as the value of "QUANTIZE_FORCE", but I'm not sure if the matters or not.
-Steve
Espen Isaksen wrote:
Yes, that is what we have been doing all along. I guess I never should
have mentioned our testing with putting lots of colors in the palette
file, as it just confuses people :-)
So forget our testing, we have only put the colors we use in the
mapfile once in the palette file(attached in the first mail), and the
error in the color is like on the map I attached(first mail).
Espen
2009/11/6 Thomas Bonfort <[email protected]>:
Stephen Woodbridge replied to this thread, and gave the correct usage
of the palette file: set the same colors in your palette file as in
your mapfile.
regards,
thomas
www.camptocamp.com
+33 5 16 57 01 02
On Fri, Nov 6, 2009 at 14:24, Espen Isaksen <[email protected]>
wrote:
Justed wanted to bring this question into attention again since we did
not get a solution to the problem, and we have not found one either.
Could this possibly be a bug in Mapserver? Should we report it?
Espen
2009/10/28 Espen Isaksen <[email protected]>:
Hi!
We are testing out using a palette file in our outputformat to
decrease file size in the png output. Most of the time this works
great, but some times when we are tiling the data we get some errors.
The color seem to shift to a similar color from one tile to another.
We have added the colors we use in the map file in the palette.txt
file. The documentation says it needs 256 colors in the map file, but
we do not use that many colors right now. (we tried adding the same
color more than one time, but that created other problems....)
I have attached a png file showing the problem across a lake. The
color on the right side is the correct color and the color we have
added to the palette file. The color on the left side of the lake is
not something we have set.
I have also added the palette.txt file and the outputformat we use is
this:
OUTPUTFORMAT
NAME "png"
DRIVER "AGG/PNG"
MIMETYPE "image/png"
IMAGEMODE "rgb"
EXTENSION "png"
FORMATOPTION "PALETTE_FORCE=TRUE"
FORMATOPTION "PALETTE=/data/maps/palette.txt"
END
Does anybody know why this happens in Mapserver and how to fix it?
Espen
_______________________________________________
mapserver-users mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/mapserver-users
_______________________________________________
mapserver-users mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/mapserver-users
_______________________________________________
mapserver-users mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/mapserver-users
_______________________________________________
mapserver-users mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/mapserver-users
