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pix-unsharp-mask
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pix-unsharp-mask
procedure
in - PPIX
in - SMOOTHING: filter is odd
int
such as 3, 5, 7. Input is halfwidth = (size - 1)/2,
i.e.
, 1, 2, 3.
in - AMOUNT is
float
, typically in range 0.2 to 0.7.
returns: modified ppix.