.. _pylab_examples-agg_buffer:

pylab_examples example code: agg_buffer.py
==========================================



.. plot:: /home/tcaswell/source/p/matplotlib/doc/mpl_examples/pylab_examples/agg_buffer.py

::

    """
    Use backend agg to access the figure canvas as an RGB string and then
    convert it to an array and pass it to Pillow for rendering.
    """
    
    import numpy as np
    
    import matplotlib.pyplot as plt
    from matplotlib.backends.backend_agg import FigureCanvasAgg
    
    
    try:
        from PIL import Image
    except ImportError:
        raise SystemExit("Pillow must be installed to run this example")
    
    plt.plot([1, 2, 3])
    
    canvas = plt.get_current_fig_manager().canvas
    
    agg = canvas.switch_backends(FigureCanvasAgg)
    agg.draw()
    s = agg.tostring_rgb()
    
    # get the width and the height to resize the matrix
    l, b, w, h = agg.figure.bbox.bounds
    w, h = int(w), int(h)
    
    X = np.fromstring(s, np.uint8)
    X.shape = h, w, 3
    
    try:
        im = Image.fromstring("RGB", (w, h), s)
    except Exception:
        im = Image.frombytes("RGB", (w, h), s)
    
    # Uncomment this line to display the image using ImageMagick's
    # `display` tool.
    # im.show()
    

Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)