from PIL import Image
import os
path = os.getcwd() # 获取当前路径
file_list = os.listdir()
for file in file_list:
 filename = os.path.splitext(file)[0]
 filexten = os.path.splitext(file)[1]
 if filexten == '.png' or '.jpg':
  I = Image.open(file)
  L = I.convert('L')
  L.save('灰度 - '+file)

from PIL import Image
I = Image.open('F:\\pycharm\\picture_format\\data\\lena.jpg')
I.show()
L = I.convert('L')
L.show()

from PIL import Image
I = Image.open('F:\\pycharm\\picture_format\\data\\lena.jpg')
I.show()
L = I.convert('1')
L.show()

from PIL import Image
import os
 
input_dir = '输入文件夹/'
out_dir = '输出文件夹/'
a = os.listdir(file_dir)
 
for i in a:
 print(i)
 I = Image.open(file_dir+i)
 L = I.convert('L')
 L.save(out_dir+i)