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.