[Qgis-user] Image rendering in QGis

[Andreas Neumann]

 Hi Helen,

 QGIS up to version 1.8 cannot do resampling other than "Nearest 
 Neighbour", which results in terrible display quality, esp. if you zoom 
 out. Zooming in should improve the image until you reach the "native 
 resolution".

 From version 1.9 (or 2.0) - to be probably released in early 2013, 
 there are other image resampling methods like "average", "bilinear" and 
 "cublic" - which improves the image display quality considerably. You 
 can set the resampling method separately for zooming above and beyond 
 the native resolution.

 Unfortunately you will have to wait for approx. half a year until this 
 version is released.

 There are two possible options for you:

 * Use QGIS 1.9 (nightly build) by installing it through the OSGeo4W 
 installer
 or
 * Use a WMS (such as UMN Mapserver) to render the image and embed it 
 through WMS

 Hope this helps,
 Andreas

 On Thu, 23 Aug 2012 16:46:38 +1200, Helen Widdicombe wrote:
> Hello everyone,
>
> I was given an image and a set of coordinates that should be 
> displayed
> on the image. I have georeferenced the image OK, but when I load it
> into QGis, whether it is georeferenced or not, it is pixelated and
> looks terrible. Is there a setting I can change to smooth it out a
> bit? I asked my client for her original image, so hopefully I have 
> not
> been sent a resampled copy. Maybe I was.
>
> Is there any way I can smooth it?
>
> Helen
>
> kaliana at paradise.net.nz

-- 
 --
 Andreas Neumann
 Böschacherstrasse 10A
 8624 Grüt (Gossau ZH)
 Switzerland