Hi Paul, Maybe late to the show, but another strategy would be to explicitly state the bgcolor in the WMS request that OpenLayers composes like so:
var wmsmap = new OpenLayers.Layer.WMS( "Service name", url, { width: '600', height: '512', srs: 'EPSG:28992', layers: 'Dutch provinces', styles: '', format: 'image/png', bgcolor: '0x8FCAE7' }, { singleTile: true, ratio: 1, attribution: '© 2009 Kadaster', visibility: true, isBaseLayer: true } ); Hope someone can benefit from this as well. Cheers, Edward
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