This node is a combined sharpen and noise reduction tool. It works by splitting the image into 2 components; one representing high frequency details; and one representing the low frequency or broad details (overall tone).
High Detail Contrast
0 to 10
This controls the contrast in the finely detailed parts of the image. Increase the high detail contrast to sharpen the image.
Low Detail Contrast
0 to 2
This controls the contrast in the non-detailed parts of the image.
0 to 1
Removes low amplitude detail from the high detail image (removes noise)