[mapserver-users] Black background with palette

[Alexandre Dube]

Stephen,

  Everything is there : http://trac.osgeo.org/mapserver/ticket/3217

Kind regards,

Alexandre

Stephen Woodbridge wrote:
> 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
>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> mapserver-users mailing list
>>>> mapserver-users at lists.osgeo.org
>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>>
>>
>>
>


-- 
Alexandre Dubé
Mapgears
www.mapgears.com