Thank you. PSP doesn't offer much in the way of a definition; it suggests using despeckle "to remove single-pixel specks." So I think it works in a more discrete manner than some of the other functions, but it is applied uniformly.
I see now that PSP (and maybe other tools) has a lot in the way of noise removing functions. I suppose one is as legal as the other so long as they are applied uniformly (the key word here, it seems).
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