image to grayscale using python

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Sara
13 Aug 2020
1import numpy as np
2import matplotlib.pyplot as plt
3import matplotlib.image as mpimg
4
5def rgb2gray(rgb):
6    return np.dot(rgb[...,:3], [0.299, 0.587, 0.144])
7
8img = mpimg.imread('img.png')
9
10gray = rgb2gray(img)
11
12plt.imshow(gray, cmap='gray')
13
14plt.savefig('greyscale.png')
15plt.show()
16
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