If you want a little more control in the Clarify effect than you can get with the Strength settings, try duplicating the layer you want to clarify, apply the effect to the duplicate layer, and then adjust the opacity of the duplicate layer to moderate the strength of the effect.
Another technique that has been suggested is to split the image to RGB (Image...Split Channel...Split to RGB), apply Clarify to each channel, and then recombine the channels (Image...Combine Channel...Combine from RGB).
Another technique that has been suggested is to split the image to RGB (Image...Split Channel...Split to RGB), apply Clarify to each channel, and then recombine the channels (Image...Combine Channel...Combine from RGB).
