The High Pass filter retains details where sharp colour transitions occur, generally at the edges, and suppresses the rest of the image.
When a High Pass filter is applied at a high radius value to a duplicate layer and combined with a contrast blend mode (such as overlay, soft light or hard light), it can be used as a useful sharpening technique.
This filter can be applied as a non-destructive, live filter. It can be accessed via the Layer menu, from the New Live Filter Layer category.
The following settings can be adjusted in the filter dialog: