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

[Thomas Bonfort]

is the blue of your lake inside your palette.txt ?
if so, you shouldn't be getting those discrepancies.

regards,

thomas
www.camptocamp.com
+33 5 16 57 01 02



On Wed, Oct 28, 2009 at 11:25, Espen Isaksen <espen.isaksen at gmail.com> wrote:
> 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
>
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