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Use a PNG file as a watermark
import numpy as np
import matplotlib

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')
fig.figimage(im, 10, 10)

fig.savefig('watermarked', transparent=True)

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