mac matplotlib 图片显示问题 和 Python is not installed as a framework

Python is not installed as a framework 报错问题

报错信息如下：

RuntimeError: Python is not installed as a framework. The Mac OS X backend will not be able to function correctly if Python is not installed as a framework. See the Python documentation for more information on installing Python as a framework on Mac OS X. Please either reinstall Python as a framework, or try one of the other backends. If you are using (Ana)Conda please install python.app and replace the use of 'python' with 'pythonw'. See 'Working with Matplotlib on OSX' in the Matplotlib FAQ for more information.

解决方法：在import matplotlib后，要use TkAgg. 

import matplotlib
matplotlib.use('TkAgg')
import matplotlib.pyplot as plt

matplotlib图片不显示问题

plt.imshow() 函数后，要加 plt.show()函数，才可显示图片

 

import matplotlib
matplotlib.use('TkAgg')
import matplotlib.pyplot as plt

import cv2
import numpy as np
from PIL import Image

path="/Users/waldenz/Documents/Work/doc/TestImages/c1.jpeg"
img1 = cv2.imread(path, 3)
img2 = Image.open(path)
img2 = np.asarray(img2)
plt.subplot(121)
plt.imshow(img1)
plt.subplot(122)
plt.imshow(img2)
# plt.figure()
plt.show()

左侧为原图。右侧为代码运行结果图

                  

关于OpenCV和PIL Image显示图片的不同，请参考另一篇文章
cv2.imread 和PIL中的image.open图片显示区别 格式互相转换