Convert PIL Image to byte array?

import io

img = Image.open(fh, mode=‘r’)
roiImg = img.crop(box)

imgByteArr = io.BytesIO()
roiImg.save(imgByteArr, format=‘PNG’)
imgByteArr = imgByteArr.getvalue()
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2.
from PIL import Image
import io

I don’t know what Python version you’re using, so I’ll try using Python 3 first

try:
import urllib.request as urllib
except ImportError:
# You are using Python 2 it turns out
import urllib

def my_func(filename, ext):
# Get the image from the URL
im = Image.open(urllib.urlopen(filename))

fp = io.BytesIO()
format = Image.registered_extensions()['.'+ext]
im.save(fp, format)
return fp.getvalue()

jpg_bin = my_func(“http://p1.pstatp.com/list/300x196/pgc-image/152923179745640a81b1fdc.webp”, “jpg”)
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3.
import io
from PIL import Image # 注意我的Image版本是pip3 install Pillow==4.3.0
import requests

res = requests.get(‘http://images.xxx.com/-7c0dc4dbdca3.webp’, stream=True) # 获取字节流最好加stream这个参数,原因见requests官方文档

byte_stream = io.BytesIO(res.content) # 把请求到的数据转换为Bytes字节流(这样解释不知道对不对，可以参照廖雪峰的教程看一下)

roiImg = Image.open(byte_stream) # Image打开Byte字节流数据

imgByteArr = io.BytesIO() # 创建一个空的Bytes对象

roiImg.save(imgByteArr, format=‘PNG’) # PNG就是图片格式，我试过换成JPG/jpg都不行

imgByteArr = imgByteArr.getvalue() # 这个就是保存的图片字节流

下面这一步只是本地测试， 可以直接把imgByteArr，当成参数上传到七牛云

with open("./abc.png", “wb”) as f:
f.write(imgByteArr)