python中opencv与PIL图片读取保存及相互转化方式

import cv2
img = cv2.imread('img.jpg')
cv2.imshow('img', img)  # 图片显示
cv2.waitKey()  # 括号内的输入控制imshow的持续时间

from PIL import Image
image = Image.open("img.jpg")
image.show()

import cv2
from PIL import Image
import numpy
image = Image.open("img.jpg")  # PIL读取
img = cv2.cvtColor(numpy.asarray(image), cv2.COLOR_RGB2BGR)  # 转换代码
cv2.imshow('img', img)  # opencv显示
cv2.waitKey()

import cv2
from PIL import Image
img = cv2.imread('img.jpg')  # opencv读取
image = Image.fromarray(cv2.cvtColor(img, cv2.COLOR_BGR2RGB))  # 转换代码
image.show()  # PIL显示

import cv2
img = cv2.imread('img.jpg')
cv2.imwrite('XXX.jpg', img)  # 保存为XXX.jpg

from PIL import Image
image = Image.open("img.jpg")
image.save('XXX.jpg')  # 保存为XXX.jpg

import cv2
import numpy as np
from PIL import Image
def load_img_by_cv(file):
    return cv2.imread(file)
def load_img_by_PIL(file):
    return Image.open(file)
def cv2PIL(img_cv):
    return Image.fromarray(cv2.cvtColor(img_cv,cv2.COLOR_BGR2RGB))
def PIL2cv(img_pil):
    return cv2.cvtColor(np.asarray(img_pil),cv2.COLOR_RGB2BGR)