#!/usr/bin/env python3.5.2
# -*- coding: utf-8 -*-
'''4图片灰度调整及二值化：
集成环境：win10 python3 Pycharm
'''

from PIL import Image

# load a color image
im = Image.open('picture\\haha.png' )#当前目录创建picture文件夹

# convert to grey level image
Lim = im.convert('L' )
Lim.save('pice.jpg' )

# setup a converting table with constant threshold
threshold = 185
table = []
for i in range(256):
  if i < threshold:
    table.append(0)
  else:
    table.append(1)

# convert to binary image by the table
bim = Lim.point(table, '1' )

bim.save('picf.png' )