[mapserver-users] FORMATOPTION "PALETTE_FORCE=TRUE" problem

[paalkr]

Hi Thomas,

thanks for the quick answer! Applying ",255" at the end of every record in
the palette.txt file worked, but when I made the WMS GetMap request I got an
image in return where all the areas that should have been transparent where
black (transparent=true). When using transparent=false I got an image in
return where the "nodata" areas were filled with the bgcolor parameter
value, which is of course the right response.

The original palette.txt file with only r,g,b values caused the mentioned
error message with both transparent=true and transparent=false, but I
suspected it to work in the latter case.

Adding imagemode rgba didn't do any difference in any way. What exactly
should the effect of adding this to the outputformat be? 


Regards,
Pål Kristensen


thomas bonfort wrote:
> 
> are you calling this with a transparent=true ??
> in that cas, your palette file should be a list of quadruplets
> (r,g,b,a) (and it would be better to have an outputformat with
> imagemode rgba, and use that one instead of passing transparent=true)
> 
> thomas
> 
> On Tue, Jan 6, 2009 at 15:56, paalkr <pal.kristensen at statkart.no> wrote:
>>
>> Hi!
>>
>> I have tried to use the FORMATOPTION "PALETTE_FORCE=TRUE" with no luck.
>> I've
>> goth this error message all the time:
>>
>> [Tue Jan  6 15:26:05 2009].409786 msDrawMap(): Layer 3 (N500Hoydelag),
>> 0.161s
>> [Tue Jan  6 15:26:05 2009].409998 msDrawMap(): Drawing Label Cache,
>> 0.000s
>> [Tue Jan  6 15:26:05 2009].410010 msDrawMap() total time: 0.170s
>> [Tue Jan  6 15:26:05 2009].416062 Invalid number of colors in palette:
>> Unable to access file. libpng error ()
>> [Tue Jan  6 15:26:05 2009].416108 ms_png_write_image_init(): General
>> error
>> message. error writing png header (via longjmp)
>> [Tue Jan  6 15:26:05 2009].416115 msSaveImageRGBAPalette(): General error
>> message. error in png header writing
>> [Tue Jan  6 15:26:05 2009].416122 msSaveImage() total time: 0.006s
>> [Tue Jan  6 15:26:05 2009].416170 mapserv request processing time
>> (msLoadMap
>> not incl.): 0.177s
>>
>> My ouputformat is defined like this:
>>
>>   OUTPUTFORMAT
>>      NAME "png8bit"
>>      DRIVER "AGG/PNG"
>>      MIMETYPE "image/png"
>>      EXTENSION "png"
>>      FORMATOPTION "PALETTE_FORCE=TRUE"
>>      FORMATOPTION "PALETTE=/opt/maps/kartdata2/mapfiles/palette.txt"
>>      FORMATOPTION INTERLACE=OFF
>>   END
>>
>> The palette.txt file is attached
>> http://n2.nabble.com/file/n2117781/palette.txt palette.txt
>>
>> Does anyone know whats wrong?
>> BTW: This is MapServer 5.2.1 on RedHat.
>>
>> Regards,
>> Pål Kristensen
>> --
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>>
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