[mapserver-users] Re: Use of palette file: Problems with changing colors when tiling

[Thomas Bonfort]

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 <espen.isaksen at gmail.com> 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 <espen.isaksen at gmail.com>:
>> 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
> mapserver-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>