[Qgis-user] QGIS Georeferencer and Transparency

[Siki Zoltan]

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
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