""" Use a PNG file as a watermark """ import numpy as np import matplotlib matplotlib.use('Agg') import matplotlib.image as image import matplotlib.pyplot as plt im = image.imread('../data/logo2.png') im[:,:,-1] = 0.5 # set the alpha channel fig = plt.figure() ax = fig.add_subplot(111) 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()