[MapProxy] Tiles partly black instead of transparent

[Gerald Kogler]

Finally solved the issue. Seems to be the same problem with an old
version of Pillow described before. I forgot to reboot the server so...
Update to latest version did the trick:

pip install Pillow==5.1.0



On 02/05/18 11:28, Gerald Kogler wrote:
> I'm facing an issue with WMS tiles produced by QGIS. At zoom level 20
> MapProxy fills empty parts of layers in black. This happens for certain
> geometries, mostly polygons where I only show a stroke but an empty
> fill. Here you can see a capture: https://i.stack.imgur.com/BNnkO.png
> 
> It seems to be a problem with transparencies as the parts with content
> are white instead of transparent. Here the essential part of the
> configuration:
> 
> sources:
>   test_wms:
>     type: wms
>     req:
>       url: http://qgis-server.com/service?
>       layers: Test WMS
>       transparent: true
> 
> You can check it live here, the described behaviour happens on the
> highest zoom level: http://mapa.psig.es/ssa/
> 
> I already updated Pillow to the last version as recommended in another
> thread, but without success.
> 
> Any hints?
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