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matplotlib.github.com/1.5.3/users/image_tutorial-6.py at plausible · matplotlib/matplotlib.github.com · GitHub

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import matplotlib.pyplot as plt
import matplotlib.image as mpimg
import numpy as np
img = mpimg.imread('../_static/stinkbug.png')
lum_img = img[:,:,0]
plt.hist(lum_img.flatten(), 256, range=(0.0, 1.0), fc='k', ec='k')

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