Dear Andreas, try Raster | Extraction | Clipper with a mask layer and alpha band.
Regards, Zoltan On Tue, 7 Jan 2014, Andreas Neumann wrote:
Hi, Some of my maps I georeference are rotated approx. 45 degrees because they did not point to the north before georeferencing. This is desired - however - the resulting file has a huge black background as a result of the rotation. I tried with the option "use 0 for transparency if necessary" - which helped - but the map already contains black pixels and the result is that I have a lot of tiny transparent pixels in the map, next to the transparent background I wanted. Is there a way to set this transparency to a custom RGB value that I know it is not yet used within the map? Thank you for any ideas. Andreas _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
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