[MapProxy] Black Tiles after reprojection of tile cache

[sulu]

Hi.

I know this has been asked allready but i could not find a vialbe solution
yet.
Task: Reproject an external WMTS (EPSG-3857) into a local cache in
projection EPSG-31254.
Erverithing works really nice if there wheren't those ugly black areas.
It seems to me that transparent areas from the source tiles do not retain
transparency after reprojection.

Mabe my config is missing something:

....

caches:
# Source-Cache
   basemapwmscache:
    request_format: image/png
    grids: [webmercator]
    sources: [basemapwms]

# Destination-Cache
  basemapwmscache_31254:
    request_format: image/png
    grids: [epsg31254]
    sources: [basemapwmscache]

sources:

  # Basemap-Source
  basemapwms:
    type: tile
    url:
http://maps.wien.gv.at/basemap/geolandbasemap/normal/google3857/%(z)s/%(y)s/%(x)s.png
    #transparent: true
    transparent_color: '#000000'
    grid: webmercator
    coverage:
      bbox: [1060000,5900000,1145000,6043000]
      srs: 'EPSG:3857'
    on_error:
      500:
        response: '#ede9e3'
        cache: False
      other:
        response: '#ffffff'
        cache: False

.....

  # image/transformation options
  image:
      #resampling_method: nearest
      resampling_method: bicubic
      paletted: False
      mode: RGBA


Thanks
Andy




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