[Qgis-user] Raster display options, color rendering, blending mode

[Nicolas Cadieux]

Hi, 
You probably don't have a no data value in your raster. If that no data value is "0" or worst, -32768 then that value will be use to render the image. 
 
You can temporally manually add a no data value in the layer properties. Then, that value will become transparent. If you what to add it permanently to the raster, you can use gdal warp, or add it in the "save raster" menu. 
Nicolas Cadieux M.Sc. 
Les Entreprises Archéotec inc.  
8548, rue Saint-Denis Montréal H2P 2H2 
Téléphone: 514.381.5112  Fax: 514.381.4995 
www.archeotec.ca 
On Jul 28, 2015 20:30, "Matt Boyd [via OSGeo.org]" <ml-node+s1560n5217462h83 at n6.nabble.com> wrote: 

	Hi QGISers, I was getting some odd results when adjusting this option. It took me a little while to realise that the background color was being used in the rendering process. This is something I can work around until I need to use a black background.  Is there a way to make the background color not interact with any visible layers? Thanks Matt 
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