[MapProxy] Tiles partly black instead of transparent

[Gerald Kogler]

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: Loading Image...

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?

[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

Post by Gerald Kogler
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
type: wms
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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