It amuses me that you have internalized the meaning of a technique called (without irony) "unsharp mask" but can't spend 20 minutes reading a tutorial to figure out how to do it in a different tool.

It's not for you. You have photoshop and like it, and apparently don't mind paying for it. Slamming competing software when it is blindingly obvious that you have no intention of using it is basically just knee-jerk jealousy.