[mapserver-users] Black background with palette

[Stephen Woodbridge]

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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