Hi,
In your raster properties, you can render layers using various methods like
add, multiply... It works very well. Same options are available for
vector layer and objects.
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 Sep 9, 2015 7:51 PM, "Matt Boyd [via OSGeo.org]"
<[email protected]> wrote:
Hi Group, this is possibly one of those questions about a question.
I'd like to create some blended layers that look the same as layers in QGIS
with transparency applied. I've another application that my data lives in
and they supply a calculator that's able to do some fairly reasonable maths
on different grids and other types of data. How does QGIS do transparency, and
can I use those equations / method elsewhere. Thanks Matt
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