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

[Espen Isaksen]

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 <woodbri at swoodbridge.com>:
> 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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>
>