matplotlib/examples/api/watermark_image.py at master · cybertxt/matplotlib · GitHub

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"""

Use a PNG file as a watermark

"""

from __future__ import print_function

import numpy as np

import matplotlib.cbook as cbook

import matplotlib.image as image

import matplotlib.pyplot as plt

datafile = cbook.get_sample_data('logo2.png', asfileobj=False)

print('loading %s' % datafile)

im = image.imread(datafile)

im[:, :, -1] = 0.5 # set the alpha channel

fig, ax = plt.subplots()

ax.plot(np.random.rand(20), '-o', ms=20, lw=2, alpha=0.7, mfc='orange')

ax.grid()

fig.figimage(im, 10, 10)

plt.show()