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

[Stephen Woodbridge]

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 <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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>>>
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