[Qgis-user] QGIS Georeferencer and Transparency

[Joshua Brooks]

I had the same issue, but with a mosaic image, and edited the source
rasters with Gimp to make black pixels slightly lighter. Not noticeable in
the image but enough to not be transparent.
On Jan 8, 2014 12:25 AM, "Andreas Neumann" <a.neumann at carto.net> 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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