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

[Espen Isaksen]

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 <thomas.bonfort at camptocamp.com>:
> 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
>>>
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>