GIMPHELP.ORG
a tribute and my humble
contribution of brushes,
scripts and tips for the GNU
Image Manipulation Program

Script-Fu -> Sharpness -> Sharper -> Wisest Sharpen

This is an adjustable script.
LOTS of parameters to tweaqk.. if you want to try sharpening without increasing noise.

Script-FU > Sharpness > Sharpen > Wisest Sharpen

Dialog

Original Image

Result:

Download

210_sharpness-sharper_wisest-sharpen.scm

;  This script should be placed 
;  in the user or system-wide script folder.
;
;  Windows Vista/7/8/10)
;  C:\Program Files\GIMP 2\share\gimp\2.0\scripts
;  or
;  C:\Users\YOUR-NAME\.gimp-2.8\scripts
; 
;  Windows XP
;  C:\Program Files\GIMP 2\share\gimp\2.0\scripts
;  or
;  C:\Documents and Settings\yourname\.gimp-2.8\scripts   
; 
;  Linux
;  /home/yourname/.gimp-2.8/scripts  
;