Reduce Motion Blur Using the GIMP : 6 Steps - Instructables
Blur Effect in GIMP | Illustrations to create Blur Effect in GIMP
How to Blur Backgrounds in GIMP 2.10 - Shallow Depth of Field Effect - YouTube
I made a new Gimp plugin that sharpens images with many different algorithms. It is like Gimp's "High pass" filter but with many more options. IMO, Median Sharpen is best. Follow simple