Prewitt/Sobel

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

Creates an edge mask using the Prewitt operator.

std.Sobel(clip 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.