Thanks for the quick response.
I tried following your suggestion but it doesn't seem to be quite what I
want. If I understand correctly, what it does is overlay solid grey at
50% opacity over the layer that I want to highlight. Any layers under
that layer therefore also get the 50% grey overlaid on them, which I
don't want.
I'd still really like to know what can be done using an expression for
the Global Opacity of a raster layer.
Cheers,
Jonathan
On 6/12/21 00:07, Ujaval Gandhi wrote:
I assume you are trying to set the opacity to 50% outside of a polygon
layer. This can be done using the 'Inverted Polygon' renderer. See this
screenshot https://ibb.co/Sf5HySf <https://ibb.co/Sf5HySf>
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On Sun, Dec 5, 2021 at 5:12 PM Jonathan Schultz <[email protected]
<mailto:[email protected]>> wrote:
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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