# Prewitt/Sobel

std.Prewitt(vnode clip[, int[] planes=[0, 1, 2], float scale=1])

  Creates an edge mask using the Prewitt operator.

std.Sobel(vnode clip[, int[] planes=[0, 1, 2], float scale=1])

  Creates an edge mask using the Sobel operator.

  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.

  scale

    Multiply all pixels by scale before outputting. This can be used to increase or decrease the intensity of edges in the output.