PIL和cv2是python中两个常用的图像处理库，PIL一般是anaconda自带的，cv2是opencv的python版本。base64在网络传输图片的时候经常用到。

##PIL读取、保存图片方法
from PIL import Image
img = Image.open(img_path)
img.save(img_path2)

##cv2读取、保存图片方法
import cv2
img = cv2.imread(img_path)
cv2.imwrite(img_path2,img)

##图片文件打开为base64
import base64

def img_base64(img_path):
  with open(img_path,"rb") as f:
    base64_str = base64.b64encode(f.read())
  return base64_str 

1、PIL和cv2转换

##PIL转cv2
import cv2
from PIL import Image
import numpy as np

def pil_cv2(img_path):
  image = Image.open(img_path)
  img = cv2.cvtColor(np.asarray(image),cv2.COLOR_RGB2BGR)
  return img

##cv2转PIL
import cv2
from PIL import Image

def cv2_pil(img_path):
  image = cv2.imread(img_path)
  image = Image.fromarray(cv2.cvtColor(image,cv2.COLOR_BGR2RGB))
  return image

2、PIL和base64转换

##PIL转base64
import base64
from io import BytesIO

def pil_base64(image):
  img_buffer = BytesIO()
  image.save(img_buffer,format='JPEG')
  byte_data = img_buffer.getvalue()
  base64_str = base64.b64encode(byte_data)
  return base64_str

##base64转PIL
import base64
from io import BytesIO
from PIL import Image

def base64_pil(base64_str):
  image = base64.b64decode(base64_str)
  image = BytesIO(image)
  image = Image.open(image)
  return image

3、cv2和base64转换

##cv2转base64
import cv2

def cv2_base64(image):
  base64_str = cv2.imencode('.jpg',image)[1].tostring()
  base64_str = base64.b64encode(base64_str)
  return base64_str 

##base64转cv2
import base64
import numpy as np
import cv2

def base64_cv2(base64_str):
  imgString = base64.b64decode(base64_str)
  nparr = np.fromstring(imgString,np.uint8)
  image = cv2.imdecode(nparr,cv2.IMREAD_COLOR)
  return image

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