scipy: savefig without frames, axes, only content

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EDIT

Changed aspect="normal to aspect="auto' since that changed in more recent versions of matplotlib (thanks to @Luke19).

Assuming : 

import matplotlib.pyplot as plt

To make a figure without the frame :

fig = plt.figure(frameon=False)
fig.set_size_inches(w,h)

To make the content fill the whole figure 

ax = plt.Axes(fig, [0., 0., 1., 1.])
ax.set_axis_off()
fig.add_axes(ax)

Then draw your image on it :

ax.imshow(your_image, aspect="auto")
fig.savefig(fname, dpi)

The aspect parameter changes the pixel size to make sure they fill the figure size specified in fig.set_size_inches(…). To get a feel of how to play with this sort of things, read through matplotlib’s documentation, particularly on the subject of Axes, Axis and Artist.

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