import cv2

if __name__ == '__main__':
    input_img = r'C:\Users\Administrator\Desktop\Upload\d825cc1e-6518-afd5-1b02-ed88a7a72806.jpg'


    image = cv2.imread(input_img)
    imagename = str(input_img).split(".")[0]

    # BGR2GRAY 转换成灰阶（黑白图）
    gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
    cv2.imwrite(imagename + "_gray.jpg", gray_image)

    # #反转片
    inverted_image = 255 - gray_image
    blurred = cv2.GaussianBlur(inverted_image, (21, 21), 0)
    inverted_blurred = 255 - blurred
    pencil_sketch = cv2.divide(gray_image, inverted_blurred, scale=256.0)
    cv2.imwrite(imagename + "_pencil.jpg", pencil_sketch)