refer to: https://matplotlib.org/stable/gallery/text_labels_and_annotations/watermark_text.html#sphx-glr-gallery-text-labels-and-annotations-watermark-text-py

Text watermark

A watermark effect can be achieved by drawing a semi-transparent text.

import numpy as npimport matplotlib.pyplot as plt# Fixing random state for reproducibilitynp.random.seed(19680801)fig, ax = plt.subplots()ax.plot(np.random.rand(20), '-o', ms=20, lw=2, alpha=0.7, mfc='orange')ax.grid()ax.text(0.5, 0.5, 'created with matplotlib', transform=ax.transAxes,
        fontsize=40, color='gray', alpha=0.5,
        ha='center', va='center', rotation='30')plt.show()

References

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

• matplotlib.figure.Figure.text

Download Python source code: watermark_text.py

Download Jupyter notebook: watermark_text.ipynb