sharpen photo cfr photoshop action

[denzjos]

An action in photoshop is great to sharpen photos. It is concerning the following action, Russell Brown's detailing action that one can found on: https://www.photoshop.com/spotlights/russell-brown. I tried to make the same thing in gimp, but I think I missed something because the result is a more colorful photo, but it is not sharpen. It use a negative curve preset in photoshop. I don't know how to do that in gimp. Anyone? Thanks in advance.