Creating outer glow effect depending on the graduated symbology color of a shapefile - QGIS

Question

I am working with a line shapefile that represents the road network of a city. I used a graduated symbology to draw each roads depending on their attribute value.

Now, I want to get the outer glow of each lines for visualisation purposes. Going to Symbology > symbol > effect only allows me to add a outer glow effect to the whole network at one with a definite color. I, however, would like to have the glow color depending on the line it is linked to.

Here's an example in case I was not clear enough:

This is the network colored depending on the roads attributes values:

And this is what I get when I add the outer glow effect to it which is not what I am looking for:

What I want is for the red roads glow to be red, for the blue ones to be blue, for the green ones to be also green etc.

Is there a way of doing so? I have been looking for a while and didn't come across any answers yet.

Answer 1

You have two choices

• Solution 1: Geometry generator and ShapeBurst

Follow the accepted answer: QGIS 3 How to Create Glow on Layer with Gradient Symbology

• Solution 2: Stack as many Blur effects as you need to get the desired result

^{Effect Stack}

^Result