Clarity

This script is a filter trying to imitate the effect of Clarity slider. This is in essence USM (Unsharp Mask) masked to be effective only in midtones. For best results try large radius values (100 or above).

See samples:
Original:

Clarity filter:

Download from:
https://sourceforge.net/projects/johnlakgimp/files/Clarity/

Copy the .scm file into:
Windows Vista/7:
C:\Users\[USER]\.gimp-2.8\scripts

Windows XP and older:
c:\Documents and Settings\[USER]\.gimp-2.8\scripts

Linux:
/home/[USER]/.gimp-2.8/scripts

In GIMP you will find it under the Filters/Enhance/Clarity menu.

New in Version: 1.1:
> Menu repositioning
> Single layer output