EFTA01222492Dataset 9
6p1,346w
…and 5 are useful. Use a higher threshold for grainy images or skin tones (5 or sometimes more), so die filter won't merely amplify noise in the image. In our example, we used the following values: Amount—I20: Radius—Ii Threshold-5 As you can see, applying an Unsharp Mask effect to this image has produced a subtle, yet very effective result. The subjects' faces are enhanced, and detail in the flowers and background is revealed, without introducing 'noise…
https://www.justice.gov/epstein/files/DataSet%209/EFTA01222492.pdf