In [1]:

    

import cv2


    

In [2]:

    

import matplotlib.pyplot as plt


    

In [3]:

    

img_gray = cv2.imread('bike.jpg',cv2.IMREAD_GRAYSCALE)


    

In [4]:

    

plt.imshow(img_gray, cmap='gray')


    

    
Out[4]:





<matplotlib.image.AxesImage at 0x7f19c6109f98>

In [5]:

    

plt.show()


    

In [6]:

    

print('Gray image shape:', img_gray.shape)


    

    




Gray image shape: (590, 670)

In [7]:

    

print('File_size:', img_gray.size/1024/8, 'KB')


    

    




File_size: 48.25439453125 KB

In [8]:

    

img_cropped = img_gray[250:550,400:650]


    

In [9]:

    

plt.imshow(img_cropped, cmap='gray')


    

    
Out[9]:





<matplotlib.image.AxesImage at 0x7f19c487cdd8>

In [10]:

    

plt.show()


    

In [11]:

    

print('Cropped image shape:', img_cropped.shape)


    

    




Cropped image shape: (300, 250)

In [12]:

    

print('File_size_cropped:', img_cropped.size/1024/8, 'KB')


    

    




File_size_cropped: 9.1552734375 KB