process.py

import cv2


def get_sketch(image_path):
    image = cv2.imread(image_path)

    # add gray effect
    gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

    # invert the image
    inverted_image = cv2.bitwise_not(gray_image)

    # blur the image
    blur_image = cv2.GaussianBlur(inverted_image, (21, 21), 0)

    # create inverted blur image
    inverted_blur = cv2.bitwise_not(blur_image)

    # divide the gray image and inverted blur

    sketch = cv2.divide(gray_image, inverted_blur, scale=256.0)

    # save the file to the folder

    return sketch