Adjust > Add / Remove Noise > Despeckle
The Despeckle filter allows you to smooth areas in which noise is noticeable while leaving complex areas untouched. The effect is that grain or other noise is reduced without severely affecting edges.
1. Choose Adjust > Add / Remove Noise > Despeckle
2. Use the following options:
Use this option to control how much the tonal values of neighboring pixels must diverge from the center pixel value before being part of the blur. Pixels with tonal value differences less than the Threshold value are excluded from the blur.

Min = 0, Max = 255, Default = 128.
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