[mapserver-users] Black background with palette

[Stephen Woodbridge]

Alexandre,

Try this as a hack and see if it helps.
Create a dummy LAYER like:

LAYER
   NAME "pixel"
   STATUS DEFAULT
   TYPE POINT
   TRANSFORM OFF
   FEATURE
     POINTS 0 0 END
   END
   CLASS
     COLOR <backgroundcolor>
   END
END

and make it your first layer. This will draw a one pixel dot in the 
upper left corner of the image in background color, but it might fake 
out mapserver if you have it some funny corner case.

Also can you reproduce this with a mapfile with one layer like the 
above, but with POINTS -2 -2 END so that it is drawn off the image? THen 
post you that makefile and we can try it.

What version of mapserver?

Otherwise if that doesn't work, maybe someone has other ideas.

-Steve W

Alexandre Dube wrote:
> Stephen,
> 
>  The MAP imagecolor isn't black and to put it at first position in my 
> palette file but that didn't help.
> 
> Thanks for your help,
> 
> Alexandre
> 
> 
> Stephen Woodbridge wrote:
>> Another thought on this is the because you are asking for a 
>> transparent image, the IMAGECOLOR tag is usually transparent and I 
>> have seen that come up as black in some cases.
>>
>> -Steve W
>>
>> Stephen Woodbridge wrote:
>>> Alexandre,
>>>
>>> Do you have IMAGECOLOR "#000000" set at the MAP level? Also I would 
>>> put the background color as the first color in the mypalette.txt file 
>>> and see if that helps.
>>>
>>> -Steve W
>>>
>>> Alexandre Dube wrote:
>>>> Hi,
>>>>
>>>> == problem ==
>>>>
>>>>  I'm pretty sure I saw this problem on the list somewhere, but I 
>>>> couldn't find the actual thread so here it is : while using
>>>> agg & palette option, when there's no data to draw, instead of 
>>>> having the backgroundcolor drawn it's all black instead.
>>>>  How can I go around this problem ?
>>>>
>>>>
>>>> == my actual need ==
>>>>
>>>>  I want to produce smaller images.  Currently, my getMap renders a 
>>>> 66K png image.  With the palette, it's down to 17K but with a black 
>>>> background.
>>>>
>>>>
>>>> == ouputformat definition ==
>>>>
>>>>    OUTPUTFORMAT
>>>>                NAME aggpng24
>>>>                DRIVER AGG/PNG
>>>>                MIMETYPE "image/png"
>>>>                IMAGEMODE RGB
>>>>                EXTENSION "png"
>>>>                FORMATOPTION "INTERLACE=OFF"
>>>>                FORMATOPTION "PALETTE_FORCE=ON"
>>>>                FORMATOPTION "PALETTE=/my/path/mypalette.txt"
>>>>                TRANSPARENT ON
>>>>                FORMATOPTION "TRANSPARENT=ON"
>>>>    END
>>>>
>>>>
>>>
>>> _______________________________________________
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>>> mapserver-users at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>
> 
>