Watermark image

Using a PNG file as a watermark.

import numpy as np
import matplotlib.cbook as cbook
import matplotlib.image as image
import matplotlib.pyplot as plt


with cbook.get_sample_data('logo2.png') as file:
    im = image.imread(file)

fig, ax = plt.subplots()

ax.plot(np.sin(10 * np.linspace(0, 1)), '-o', ms=20, alpha=0.7, mfc='orange')
ax.grid()
fig.figimage(im, 10, 10, zorder=3, alpha=.5)

plt.show()

Out:

/build/matplotlib-Aszjp3/matplotlib-3.2.0/examples/images_contours_and_fields/watermark_image.py:15: MatplotlibDeprecationWarning:
The MATPLOTLIBDATA environment variable was deprecated in Matplotlib 3.1 and will be removed in 3.3.
  with cbook.get_sample_data('logo2.png') as file:

---

References

The use of the following functions, methods, classes and modules is shown in this example:

import matplotlib
matplotlib.image
matplotlib.image.imread
matplotlib.pyplot.imread
matplotlib.figure.Figure.figimage

Out:

<function Figure.figimage at 0x7fa64ab4daf0>