scipy: savefig without frames, axes, only content

Question

In numpy/scipy I have an image stored in an array. I can display it, I want to save it using savefig without any borders, axes, labels, titles,... Just pure image, nothing else.

I want to avoid packages like PyPNG or scipy.misc.imsave, they are sometimes problematic (they do not always install well, only basic savefig() for me

Answer 1

EDIT

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

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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.

Answer 2

An easier solution seems to be:

fig.savefig('out.png', bbox_inches='tight', pad_inches=0)