main.py

import cv2
import numpy as np


def dodge_v2(image, mask):
    return cv2.divide(image, 255 - mask, scale=256)


def img2sketch(source_path, destination_path):
    source_photo = cv2.imread(source_path)
    scale_percent = 1

    width = int(source_photo.shape[1] * scale_percent)
    height = int(source_photo.shape[0] * scale_percent)
    dim = (width, height)
    resized = cv2.resize(source_photo, dim, interpolation=cv2.INTER_AREA)

    kernel_sharpening = np.array([[-1, -1, -1], [-1, 9, -1], [-1, -1, -1]])
    sharpened = cv2.filter2D(resized, -1, kernel_sharpening)
    gray = cv2.cvtColor(sharpened, cv2.COLOR_BGR2GRAY)
    inv = 255 - gray
    gauss = cv2.GaussianBlur(inv, ksize=(15, 15), sigmaX=0, sigmaY=0)
    pencil_photo = dodge_v2(gray, gauss)
    cv2.imwrite(destination_path, pencil_photo)


if __name__ == "__main__":
    img2sketch("Luffy.jpg", "Luffy5.jpg")