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    <p>As matplotlib <a href="http://matplotlib.sourceforge.net/api/artist_api.html#matplotlib.artist.Artist" rel="nofollow noreferrer">Artists</a> can be rasterized, any class derived from Artist (<a href="http://matplotlib.sourceforge.net/api/artist_api.html" rel="nofollow noreferrer">http://matplotlib.sourceforge.net/api/artist_api.html</a>) can be rasterized with the keyword <code>rasterized</code> set to <code>True</code>. So you can only rasterize your patches.</p> <p>I just tried some combinations and it seems to work. However the quality seems to be not very good (see also <a href="http://www.mail-archive.com/matplotlib-users@lists.sourceforge.net/msg13276.html" rel="nofollow noreferrer">http://www.mail-archive.com/matplotlib-users@lists.sourceforge.net/msg13276.html</a>).</p> <pre><code>import numpy as np import matplotlib.pyplot as plt def add_patch(ax, **kwargs): if 'rasterized' in kwargs and kwargs['rasterized']: ax.set_rasterization_zorder(0) ax.fill_between(np.arange(1, 10), 1, 2, zorder=-1, **kwargs) ax.set_xlim(0, 10) ax.set_ylim(0, 3) if 'alpha' in kwargs and kwargs['alpha'] &lt; 1: txt = 'This patch is transparent!' else: txt = 'This patch is not transparent!' ax.text(5, 1.5, txt, ha='center', va='center', fontsize=25, zorder=-2, rasterized=True) fig, axes = plt.subplots(nrows=4, sharex=True) add_patch(axes[0], alpha=0.2, rasterized=False) add_patch(axes[1], alpha=0.2, rasterized=True) add_patch(axes[2], rasterized=False) add_patch(axes[3], rasterized=True) plt.tight_layout() plt.savefig('rasterized_transparency.eps') </code></pre> <p>I converted the <code>eps</code> to png to show it in the browser:</p> <p><img src="https://i.stack.imgur.com/x6CSD.png" alt="rasterized_transparency.png"></p> <p>See also: <a href="https://stackoverflow.com/questions/5609969/how-to-save-figures-to-pdf-as-raster-images-in-matplotlib">How to save figures to pdf as raster images in matplotlib</a>.</p>
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    1. POHow to better rasterize a plot without blurring the labels in matplotlib?
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    1. POHow to better rasterize a plot without blurring the labels in matplotlib?
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    1. COThanks, I will try your example and have it tested on my own codes ASAP. Answer will be accepted by then ;-).
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