[mapserver-users] Re: Use of palette file: Problems with changingcolors when tiling
Espen Isaksen
espen.isaksen at gmail.com
Mon Nov 9 05:16:31 PST 2009
Hi again!
The mapfile we are using is about 10 000 lines of code so I have not
attached that file. I can send the map file privatly, but I rather not
put it on the mailing list. However, I have added the main map file,
the palette file and the output format file.
Espen
2009/11/7 Thomas Bonfort <thomas.bonfort at camptocamp.com>:
> Espen,
> please provide the complete mapfile and actual palette file that were
> used for the images you produced.
> looking at the code there's no reason another color should be picked
> if it was provided in the palette file, so either you're doing
> something wrong in your mapfile/palette combination, either there's a
> bug in the code somewhere.
>
> thomas
> www.camptocamp.com
> +33 5 16 57 01 02
>
>
>
> On Sat, Nov 7, 2009 at 11:48, Espen Isaksen <espen.isaksen at gmail.com> wrote:
>> Is this the only way to make it work correctly? It seems a lot easier
>> to extract all the RGB colors we use from the map file and add that to
>> the palette file? That is what we have done now, and it will be a lot
>> more work to actually extract the colors from all the different map
>> images we then have to create(different colors going from mountain
>> areas, forest areas down to urban areas).
>>
>> Espen
>>
>>
>>
>> 2009/11/6 Steve Lime <Steve.Lime at dnr.state.mn.us>:
>>> Correct. My palette creation process has been to:
>>>
>>> 1) create a master image that shows as many possible rendering outputs as possible as a 24-bit PNG.
>>>
>>> 2) use a tool to reduce the colors in that image to the desired number and create a 8-bit file. In my case
>>> I use PhotoShop and produce a gif. Here's a link to the one I used for our rec. compass app but after
>>> color reduction to 128 colors.
>>>
>>> http://maps.dnr.state.mn.us/compass/remove/compass_color_master.gif
>>>
>>> 3) extract a palette from the 8-bit image. I wrote a little perl script that processes gdalinfo output.
>>>
>>> 4) my outputformat block is like so:
>>>
>>> OUTPUTFORMAT
>>> NAME png
>>> DRIVER "AGG/PNG"
>>> MIMETYPE "image/png"
>>> IMAGEMODE RGB
>>> EXTENSION "png"
>>> FORMATOPTION "INTERLACE=OFF"
>>> FORMATOPTION "PALETTE_FORCE=TRUE"
>>> FORMATOPTION "PALETTE=/mapserver/compass/compass.palette"
>>> END
>>>
>>> I've not had problems with this method...
>>>
>>> It's possible there's a bug but it's going to be difficult to fix without a good test case.
>>>
>>> Steve
>>>
>>>>>> On 11/6/2009 at 9:52 AM, in message
>>> <a4cd3760911060752i609ad757g9872b8ff5a9b5c27 at mail.gmail.com>, Espen Isaksen
>>> <espen.isaksen at gmail.com> wrote:
>>>> 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
>>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> mapserver-users mailing list
>>>>>>>> mapserver-users at lists.osgeo.org
>>>>>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>>>>>>>
>>>>>> _______________________________________________
>>>>>> mapserver-users mailing list
>>>>>> mapserver-users at lists.osgeo.org
>>>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>>>>
>>>>>
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>>>
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>
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