[Qgis-user] Blending layers question

[Matt Boyd]

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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