PIL.Image、Base64 String、Requests图片rst.content的互相转换

转自：PIL.Image与Base64 String的互相转换 - 简书

0.环境

• py2: python2.7.13
• py3: python3.6.2
• PIL: pip(2/3) install pillow, PIL库已不再维护，而pillow是PIL的一个分支，如今已超越PIL

1.Convert PIL.Image to Base64 String

• py2 ：
  先使用CStringIO.StringIO把图片内容转为二进制流，再进行base64编码

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

import base64
from cStringIO import StringIO

# pip2 install pillow
from PIL import Image


def image_to_base64(image_path):
    img = Image.open(image_path)
    output_buffer = StringIO()
    img.save(output_buffer, format='PNG')
    binary_data = output_buffer.getvalue()
    base64_data = base64.b64encode(binary_data)
    return base64_data

• py3:
  python3中没有cStringIO，对应的是io，但却不能使用io.StringIO来处理图片，它用来处理文本的IO操作，处理图片的应该是io.BytesIO

import base64
from io import BytesIO

# pip3 install pillow
from PIL import Image

# 若img.save()报错 cannot write mode RGBA as JPEG
# 则img = Image.open(image_path).convert('RGB')
def image_to_base64(image_path):
    img = Image.open(image_path)
    output_buffer = BytesIO()
    img.save(output_buffer, format='PNG')
    byte_data = output_buffer.getvalue()
    base64_str = base64.b64encode(byte_data)
    ret