程式碼如下

# -*- coding:utf-8 -*-


import cv2
import numpy as np
from tkinter import filedialog,Tk
from os import getcwd
from re import findall


def open_path():
  # 圖片路徑
  root = Tk()
  root.withdraw()
  file_path = (filedialog.askopenfilename(title='選擇圖片檔案',filetypes=[('All Files','*')]))
  return file_path


def dodgeNaive(image,mask):
  # determine the shape of the input image
  width,height = image.shape[:2]

  # prepare output argument with same size as image
  blend = np.zeros((width,height),np.uint8)

  for col in range(width):
    for row in range(height):
      # do for every pixel
      if mask[col,row] == 255:
        # avoid division by zero
        blend[col,row] = 255
      else:
        # shift image pixel value by 8 bits
        # divide by the inverse of the mask
        tmp = (image[col,row] << 8) / (255 - mask)
        # print('tmp={}'.format(tmp.shape))
        # make sure resulting value stays within bounds
        if tmp.any() > 255:
          tmp = 255
          blend[col,row] = tmp

  return blend


def dodgeV2(image,mask):
  return cv2.divide(image,255 - mask,scale=256)


def burnV2(image,mask):
  return 255 - cv2.divide(255 - image,scale=256)


def rgb_to_sketch(src_image_name):
  print('轉換中......')
  img_rgb = cv2.imread(src_image_name)
  img_gray = cv2.cvtColor(img_rgb,cv2.COLOR_BGR2GRAY)
  # 讀取圖片時直接轉換操作
  # img_gray = cv2.imread('example.jpg',cv2.IMREAD_GRAYSCALE)

  img_gray_inv = 255 - img_gray
  img_blur = cv2.GaussianBlur(img_gray_inv,ksize=(21,21),sigmaX=0,sigmaY=0)
  img_blend = dodgeV2(img_gray,img_blur)

  # cv2.imshow('original',img_rgb)
  # cv2.imshow('gray',img_gray)
  # cv2.imshow('gray_inv',img_gray_inv)
  # cv2.imshow('gray_blur',img_blur)
  cv2.imwrite(dst_image_name,img_blend)
  save_path = getcwd() + "\\" + dst_image_name # 儲存路徑
  print('轉換完成!!!\n')
  print('儲存路徑:' + save_path)
  cv2.imshow(save_path,img_blend)
  cv2.waitKey(0)
  cv2.destroyAllWindows()


if __name__ == '__main__':
  print('請選擇圖片(路徑不要含中文)：')
  src_image_name = open_path() # 檔案路徑
  print(src_image_name + '\n')
  image_name = ''.join(findall(r'[^\\/:*?"<>|\r\n]+$',src_image_name)) # 獲取檔名
  dst_image_name = 'Sketch_' + image_name
  rgb_to_sketch(src_image_name)

效果如下

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