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masks

Functions:

range_mask 

range_mask(
    clip: VideoNode, rad: int = 2, radc: int = 0
) -> ConstantFormatVideoNode
Source code 
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@limiter
def range_mask(clip: vs.VideoNode, rad: int = 2, radc: int = 0) -> ConstantFormatVideoNode:
    assert check_variable(clip, range_mask)

    def _minmax(clip: vs.VideoNode, iters: int, maxx: bool) -> vs.VideoNode:
        func = Morpho.maximum if maxx else Morpho.minimum

        for i in range(1, iters + 1):
            clip = func(clip, coordinates=Coordinates.from_iter(i))

        return clip

    return join([
        ExprOp.SUB.combine(
            _minmax(plane, r, True),
            _minmax(plane, r, False)
        ) for plane, r in zip(
            split(clip), normalize_seq(radc and [rad, radc] or rad, clip.format.num_planes)
        )
    ])