Quote Originally Posted by ricktas View Post
High Pass sharpening has two big advantages. The first advantage is that the sharpening is done on a separate layer. With High Pass sharpening applied on a separate layer, not only can the sharpening be adjusted at a later date but also can be completely undone simply by deleting the layer that was added during the High Pass Sharpening process.

The second advantage is that the High Pass sharpening technique uses the High Pass filter, which isolates the edges. Thus, High Pass sharpening applies sharpening primarily to the edges where it is needed and protects smoother areas from the sharpening.

Thanks (yet again) Rick for reminding me about this ...completely forgotten about this I will have to bookmark this for latter reference.