# Minimum/Maximum

std.Minimum(vnode clip[, int[] planes=[0, 1, 2], float threshold, bint[] coordinates=[1, 1, 1, 1, 1, 1, 1, 1]])

  Replaces each pixel with the smallest value in its 3x3 neighbourhood. This operation is also known as erosion.

  clip

    Clip to process. It must have integer sample type and bit depth between 8 and 16, or float sample type and bit depth of 32. If there are any frames with other formats, an error will be returned.

  planes

    Specifies which planes will be processed. Any unprocessed planes will be simply copied.

  threshold

    Allows to limit how much pixels are changed. Output pixels will not become less than `input - threshold`. The default is no limit.

  coordinates

    Specifies which pixels from the 3x3 neighbourhood are considered. If an element of this array is 0, the corresponding pixel is not considered when finding the minimum value. This must contain exactly 8 numbers.

    Here is how each number corresponds to a pixel in the 3x3 neighbourhood:

        1 2 3
        4   5
        6 7 8

std.Maximum(vnode clip[, int[] planes=[0, 1, 2], float threshold, bint[] coordinates=[1, 1, 1, 1, 1, 1, 1, 1]])

  Replaces each pixel with the largest value in its 3x3 neighbourhood. This operation is also known as dilation.

  clip

    Clip to process. It must have integer sample type and bit depth between 8 and 16, or float sample type and bit depth of 32. If there are any frames with other formats, an error will be returned.

  planes

    Specifies which planes will be processed. Any unprocessed planes will be simply copied.

  threshold

    Allows to limit how much pixels are changed. Output pixels will not become less than `input - threshold`. The default is no limit.

  coordinates

    Specifies which pixels from the 3x3 neighbourhood are considered. If an element of this array is 0, the corresponding pixel is not considered when finding the maximum value. This must contain exactly 8 numbers.

    Here is how each number corresponds to a pixel in the 3x3 neighbourhood:

        1 2 3
        4   5
        6 7 8