[Qgis-user] Georeferencer takes excessive time

[Jonathan Webb]

QGIS 2.18 on Linux Mint 18.1 64 bit

I recently  had to clean install my OS & QGIS etc.  Whilst it's mostly 
working, the raster georeferencer is unusably slow most of the time.

I thought initially it didn't like jpgs and pdfs were OK, but it is the 
same regardless.  On clicking transform, the progress indication window 
opens & it will sit there for an indeterminate period (I left it over 30 
minutes once). There is a lot of CPU activity across all four cores.  
The only way out I've found is to kill QGIS.

If I have the Target Resolution box empty, the result is an image 
comprising large blocks/pixels and a wide black component.  If I select 
the target resolution, I can improve the image (but still unusable) 
however, to get anything vaguely usable, the process takes ages as 
mentioned above

All my previous installations have been fine & I have never had a 
problem with the georeferencer.

Any ideas where to look please?
Many thanks
-- 
Jonathan Webb
Freelance GIS Specialist
07941 921905
http://www.jwebbgis.co.uk
http://uk.linkedin.com/in/jwebbgis
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