pylab_examples example code: to_numeric.py

(Source code, png)

#!/usr/bin/env python
"""
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 pylab
from matplotlib.backends.backend_agg import FigureCanvasAgg

try:
    from PIL import Image
except ImportError:
    raise SystemExit("PIL must be installed to run this example")

pylab.plot([1, 2, 3])

canvas = pylab.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 = pylab.fromstring(s, pylab.uint8)
X.shape = h, w, 3

im = Image.fromstring("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 Search examples)