Yes, I used the shadow effect, just setting Offset X and Offset Y to 0, so it behaved more like a glow or “luminous” as you put it.
It’s a simple way of increasing the shadow / glow / luminous intensity.
In image editing software (I used Gimp), you can duplicate the layer, over and over, until you have the intensity you need. Then export it as a PNG (with alpha) again.
The repository is here:
You could probably run this locally via Node.js?
You can also install it as a web-app:
