This time, I made method of Make clean edge without "GIMP's edge detect", I share this method today.
I Hope this method will become GIMP's new edge-detect effect...
First, Selest object by Fuzzy Select Tool.

And Select -> Glow, Glow selected range. (ex. about 7px this time)


And Invert Selected

Select Object again!

And Invert Selected once more.

Create new layer for Final result

Paint selected area at Bukket fill tool

Complete!

Usage Example for artwork

https://www.flickr.com/photos/154078448 ... ateposted/