Wand sketch() function - Python

Wand - sketch() function in Python

Last Updated : 25 Apr, 2025

Sketch is another artistic special effect present in Wand library in python. sketch() function generates a pencil sketched image in output.For best results, radius value should be larger than sigma.

Syntax :
Python3 wand.image.sketch( radius, sigma, angle) # radius should always be greater than sigma(standard deviation)
Parameter :

Parameter Input Type Description
radius numbers.Real Size of Gaussian aperture.
sigma numbers.Real standard deviation of the Gaussian operator.
angle numbers.Real direction of blur.

Source Image:

Example #1:

Python3

# import display() to show final image
from wand.display import display

# import Image from wand.image module
from wand.image import Image

# read file using Image function
with Image(filename ="koala.jpeg") as img:

    # generate pencil sketch image using sketch() function
    img.sketch(0.5, 0.0, 98.0)

    # save final image
    img.save(filename ="rb_koala.jpeg")

    # display final image
    display(img)

Output :

Example #2: To get the best result transform image to grayscale image

Python3

# import display() to show final image
from wand.display import display

# import Image from wand.image module
from wand.image import Image

# read file using Image function
with Image(filename ="koala.jpeg") as img:

    # transform to grayscale image
    img.transform_colorspace("gray")

    # generate pencil sketch image using sketch() function
    img.sketch(0.5, 0.0, 98.0)

    # save final image
    img.save(filename ="rb_koala.jpeg")

    # display final image
    display(img)

Output :

Wand sketch() function - Python

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RahulSabharwal

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