[OSM-dev] OT: generate_tiles.py generates blank images

John McKerrell john at mckerrell.net
Wed Oct 1 20:42:27 BST 2008


On 1 Oct 2008, at 20:40, Jon Burgess wrote:

> On Wed, 2008-10-01 at 18:54 +0100, John McKerrell wrote:
>>
>> I'm trying to generate some tiles for postcode boundaries of a
>> single
>> UK city using mapnik. I've successfully generated a single image but
>> when I try passing the same XML file into generate_tiles.py I just
>> get
>> blank data back. Does anyone have any suggestions for why?
>
> Some versions of ImageMagick have a bug which causes the tool to
> generate blank files. Try commenting out the line with the 'convert'
> command and the call line following it.
>
> 	Jon
>
Actually I did that anyway as I guessed it might be removing the alpha  
transparency that I wanted.

Thanks for the suggestion tho,

John





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