This is a subtle noise reduction tool. It replaces pixels that are significantly different from their neighbors; you control which neighbors are used to compare against using Method
Mix controls the degree of the effect. The other sliders affect how intense and how sensitive the effect is. As each image is different, it is worth experimenting with the settings to see what kind of results you get.
When ✓ Similar is checked, Simrange controls how different pixel colors must be to be considered "different."
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