Dear Geoserver-users,

As someone new to Geoserver, I don’t know if what I ask is a bug, a
pebkac, or simply not possible:

I’ve published two GeoTIFFs to my Geoserver install (both on
ESPG:27700) and added them as non-base layers on a Google Map base in
OpenLayers.

Where Geoserver is re-projecting the tiffs, it’s leaving a honking
great black border. I’ve added transparency requests on the layer, but
they appear to be ignored.

Could anyone suggest what I’ve done wrong?

Associated layer code:

           tg04v1 = new OpenLayers.Layer.WMS(
               "TG04V1", serverURL,
               {
                   LAYERS: 'test:TG04_CopyRaster1',
                   STYLES: '',
                   format: 'image/png8',
                   transparent: true,
                   tiled: !pureCoverage,
                   tilesOrigin : map.maxExtent.left + ',' + map.maxExtent.bottom
               },
               {
                   buffer: 0,
                   displayOutsideMaxExtent: true,
                   isBaseLayer: false,
                   transparent: true,
                   opacity: 0.9,
                   visibility: false
               }
           );

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