QGIS Styling – Creating Reverse of Inner Glow When Styling Polygon in QGIS

Question

In QGIS 3.22.1, the Inner Glow effects property (below) creates a sharp outer boundary that fades towards the inside.

I would expect that the Outer Glow effects property (below) would provide the "reverse" of the Inner Glow: a sharp polygon boundary fading to the outside. However, it results in a glow to both(!) sides of the polygon boundary, with no sharp boundary delineation.

How do I create the reverse of the Inner Glow: a sharp boundary that fades to the outside?

I tried using the Inner Glow with negative Spread and Radius, but no joy.

Answer 1

Set layer rendering to Inverted Polygons and Symbol layer type to Shapeburst fill and under Shading style set a distance. Set the second color (here: white) to transparent to see the background: