[Qgis-user] Georeferencer takes excessive time

[Nicolas Cadieux]

Hi,

Are you using the same interpolation methods?  If you used nearest neighbour normally and changed to cubic, if could take much more time for the same thing. Check the file size and try with a smaller file.  Could be a very simple thing....

Nicolas

> Le 15 mai 2017 à 06:39, UserError [via OSGeo.org] <ml+s1560n5320539h70 at n6.nabble.com> a écrit :
> 
> 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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