<p dir="ltr">Hi,<br>
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.<br>
<br>
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.</p>
<p dir="ltr">Nicolas Cadieux M.Sc.<br>
Les Entreprises Archéotec inc. <br>
8548, rue Saint-Denis Montréal H2P 2H2<br>
Téléphone: 514.381.5112 Fax: 514.381.4995<br>
www.archeotec.ca</p>
<div class="gmail_quote">On Jul 28, 2015 20:30, "Matt Boyd [via OSGeo.org]" <<a href="/user/SendEmail.jtp?type=node&node=5217465&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>> wrote:<br type='attribution'><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hi QGISers,<div>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. </div><div><br /></div><div>Is there a way to make the background color not interact with any visible layers?</div><div><br /></div><div>Thanks</div><div>Matt</div></div>
<br />_______________________________________________
<br />Qgis-user mailing list
<br /><a href="/user/SendEmail.jtp?type=node&node=5217462&i=0">[hidden email]</a>
<br /><a href="http://lists.osgeo.org/mailman/listinfo/qgis-user" target="_top" rel="nofollow" link="external">http://lists.osgeo.org/mailman/listinfo/qgis-user</a>
<br />
<br />
<hr noshade="noshade" size="1" />
<div style="color:#444;font:12px 'tahoma' , 'geneva' , 'helvetica' , 'arial' , sans-serif">
<div style="font-weight:bold">If you reply to this email, your message will be added to the discussion below:</div>
<a href="http://osgeo-org.1560.x6.nabble.com/Raster-display-options-color-rendering-blending-mode-tp5217462.html" target="_top" rel="nofollow" link="external">http://osgeo-org.1560.x6.nabble.com/Raster-display-options-color-rendering-blending-mode-tp5217462.html</a>
</div>
<div style="color:#666;font:11px 'tahoma' , 'geneva' , 'helvetica' , 'arial' , sans-serif;margin-top:0.4em;line-height:1.5em">
To start a new topic under Quantum GIS - User, email ml-node+s1560n4125267h38@n6.nabble.com <br />
To unsubscribe from Quantum GIS - User, <a href="http://osgeo-org.1560.x6.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=4125267&code=bmljb2xhcy5jYWRpZXV4QGFyY2hlb3RlYy5jYXw0MTI1MjY3fDYzNDQ4MjQxNg==">click here</a>.<br />
<a href="http://osgeo-org.1560.x6.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml" style="font:9px serif">NAML</a>
</div></blockquote></div>
<br/><hr align="left" width="300" />
View this message in context: <a href="http://osgeo-org.1560.x6.nabble.com/Raster-display-options-color-rendering-blending-mode-tp5217462p5217465.html">Re: Raster display options, color rendering, blending mode</a><br/>
Sent from the <a href="http://osgeo-org.1560.x6.nabble.com/Quantum-GIS-User-f4125267.html">Quantum GIS - User mailing list archive</a> at Nabble.com.<br/>