1. opencv方法

import cv2
img_path =r"C:/Users/gf879/Pictures/Saved Pictures/cat1.jpg"
img = cv2.imread(img_path)
cv2.namedWindow('myPicture',0)
cv2.resizeWindow('myPicture', 500, 500)
cv2.imshow('myPicture',img)
cv2.waitKey()
cv2.destroyWindow('myPicture')

结果：

2. matplotlib方法

import matplotlib.pyplot as plt
img_path =r"C:/Users/gf879/Pictures/Saved Pictures/cat1.jpg"
img = plt.imread(img_path)
fig = plt.figure('show picture')
# ax = fig.add_subplot(111)
plt.imshow(img)
plt.show()

结果：

3. PIL

from PIL import Image
img=Image.open('C:/Users/gf879/Pictures/Saved Pictures/cat1.jpg')
img.show()

结果：