Hi, This sounds like http://hub.qgis.org/issues/2491
> Date: Tue, 30 Aug 2011 02:38:30 -0700 (PDT) > From: Pedro Ven?ncio <[email protected]> > Subject: [Qgis-user] Rasters alpha channel black instead of > transparent > To: "[email protected]" <[email protected]> > Message-ID: > <[email protected]> > Content-Type: text/plain; charset="iso-8859-1" > > Hello everyone, > > I was cutting some rasters in the same way I did several times in the past, > adding the alpha channel to ensure transparency: > > gdalwarp -of GTiff -r lanczos -dstalpha -cutline shapefile.shp raster_input.tif > raster_output.tif > > However, now the area that would appear transparent, is shown in black on QGIS > 1.7 (and 1.8 dev), as you can see in the picture attached. > > I've tried other software and it open the image with transparency in these > areas. > Images that I've cut in the past and opened correctly in QGIS, now are black > instead of transparent. > > Why is this happening? It is an option that can be changed? > > Thanks! > > Best regards, > Pedro Venbncio > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: alpha_channel.jpg > Type: image/jpeg > Size: 71354 bytes > Desc: not available > Url : http://lists.osgeo.org/pipermail/qgis-user/attachments/20110830/b2b9fbec /alpha_channel.jpg _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
