Correct bluring

[rich2005]

This has come up before.  Start with this about blending.

https://www.gimp-forum.net/Thread-Gimp-2...mudge-tool

To avoid the dark boundaries you will have to update to Gimp 2.10

The default settings in Gimp 2.10 avoid the problem. There is a drop-down in the tool options to revert back to (legacy) ie. the same as Gimp 2.8

   


What else? A overall linear mode set in the Image -> Precision

   

edit: the video found the earlier questions
https://www.gimp-forum.net/Thread-Gimp-2...76#pid4876
https://www.gimp-forum.net/Thread-Linear...88#pid2588