[MapProxy] Layer merging problem

[deduikertjes]

Layer merging problem

Hi List,

When (vertically) merging layers (mapproxy 1.9) results are not as expected.

Merging two layers which have fully transparent areas show only the 
topmost layer. The bottom layer is not shown as should (not at all).
If the top layer has no fully transparent areas but is completely opaque 
and opacity is set to eg 0.8 the bottom layer is shown as should.

Did I make a config error or did I run into a bug?

Any help greatly appreciated, MArco

An excerpt from my config:

services:
   tms:
     # needs no arguments
   wms:
     srs: ['EPSG:28992']
     image_formats: ['image/png', 'png']

globals:
   cache:
     minimize_meta_requests: true
     meta_size: [1, 1]
     meta_buffer: 0

   image:
     paletted: false
     formats:
       image/png:
         mode: RGBA
         transparent: true

sources:
   wms_source1:
     type: wms
     wms_opts:
       featureinfo: true
       legendgraphic: true
     supported_srs: ['EPSG:28992']
     req:
       url: 'http://myservice.nl/geoserver/gwc/service/wms?'
       layers: 'layer1'
       transparent: true

   wms_source2:
     type: wms
     wms_opts:
       featureinfo: true
       legendgraphic: true
     supported_srs: ['EPSG:28992']
     req:
       url: 'http://myservice.nl/geoserver/gwc/service/wms?'
       layers: 'layer2'
       transparent: true

caches:
   _source1:
      sources: [wms_source1]
      link_single_color_images: true
      disable_storage: true
      image: {opacity: 0.8}

   _source2:
      sources: [wms_source2]
      link_single_color_images: true
      disable_storage: true
      image: {opacity: 0.8}

layers:

   - name: 'layer1'
     sources: [_source1]
     title: 'layer 1'


   - name: 'layer2'
     sources: [_source2]
     title: 'Layer 2'
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/mapproxy/attachments/20170321/fac0fa09/attachment.html>