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
[image: Logo] <https://spatialthoughts.com/> Ujaval Gandhi Spatial Thoughts mobile: +91-8095684687 email: [email protected] [image: LinkedIn icon] <https://www.linkedin.com/in/spatialthoughts/> [image: Twitter icon] <https://twitter.com/spatialthoughts> On Sun, Dec 5, 2021 at 5:12 PM Jonathan Schultz <[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! > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >
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