Hello,
I'm trying to use opacity on a raster layer to highlight an area of
interest. So, for example, I would use opacity 100 for an area (defined
in another layer), and 50 for anywhere outside that area. But I can't
seem to even find basic documentation on how the Renderer opacity values
work. If I enable the Assistant I get a bunch of fields: Source (an
expression), Values from and to, plus a checkbox "Apply transform curve"
with its own set of fields.
When I google words like "Renderer opacity" all I get are references to
the source code but no documentation or examples.
This is QGIS version 3.22.0-Białowieża running on Linux/Debian.
Does anyone know how this stuff works, or how I could find out?
Thanks!
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