AW: [Qgis-user] Georeferencing plugin raster coversion

[Hugentobler Marco]

Hi Cornelius,

You might try it with no compression. There have been problems with compression that came frome the libtiff library and I don't know if they are solved now.

Regards,
Marco


-----Ursprüngliche Nachricht-----
Von: qgis-user-bounces at lists.osgeo.org im Auftrag von Cornelius Fasshauer
Gesendet: Mi 11.06.2008 16:56
An: Qgis-user at lists.osgeo.org
Betreff: [Qgis-user] Georeferencing plugin raster coversion
 
Hi everybody,
 
when using the georeferencing plugin i face the following problem:
I use 1 bpp tiff raster images which are georeferenced using
Helmert-Transformation with LZW-Compression. The plugin produces 8 bpp
GeoTiff-files.
Everthing is fine as long as i work with QGIS. When I try to  view the
modified rasterfiles with other image viewers or to attach it to
CAD-Drawings in AutoCAD everything ist black. Any attempt to convert the
files to other formats, reduce/increase color depth and so on all ended
up in the same: rectangular frames filled BLACK. Does anybody have any
ideas what can be done about this??
 
Many thanks in advance
 
c.fasshauer