[Gimp-user] How to Blur

[Helmut Jarausch <jarausch skynet be>]

Hi,
probably this is FAQ but I couldn't find an answer.

I have a light skirt of a person in foreground in front of a rather  
dark background.
I have created a selection for the background (using GMIC select  
foreground).
This selection is not feathered and clearly separates the foreground  
from the background.

Now I want to blur the background. Unfortunately I get some 'halo'  
around the foreground.
'Selective Gaussian Blur' performs better near the boundary of the  
selection but it blurs
part of the background not enough.

Many thanks for a hint,
Helmut