Extend your edges with Blur nodes become fun! Dynamic creation of 'blur-unpremult' method inside a group.
Gaussian Edge Extend
Updated: 3 October 2023
Author: Olivier_Blanchet
Compatible Nuke versions: 10.0 or later
Compatibility: Linux, Mac, Windows
Gaussian Edge Extend is based on the popular method used to spread edges pixels and avoid exctraction common issues.
This method is of course the 'blur-unpremult'.
It has Matte and Mask inputs.
Example of use:

This node is simply a group that will generate a controled number of iteration of this method! (dynamic nodes creation inside the group)
It's designed the way I use it so I suggest you to shape it your way!
UI:
Example of the inside tree with 10 iterations: