Enhancing or smoothing detail

The Detail Enhancement slider, located at the bottom of the "Exposure and Detail" filter panel, controls a sophisticated local contrast enhancement algorithm:

The slider has two modes and is very simple to use:

Here is an example of the enhancement effect. Note the improved definition of the mountain, clouds, and foliage:

And here is an illustration of the smoothing effect. The skin has been effectively smoothed, yet the image retains a sharp appearance:

Some additional examples are here.