[Python] matplotlib savefig image size with bbox_inches='tight'

I have to make a vector plot and I want to just see the vectors without the axes, titles etc so here is how I try to do it:

pyplot.figure(None, figsize=(10, 16), dpi=100)
pyplot.quiver(data['x'], data['y'], data['u'], data['v'],
pivot='tail',
units='dots',
scale=0.2,
color='black')

pyplot.autoscale(tight=True)
pyplot.axis('off')
ax = pyplot.gca()
ax.xaxis.set_major_locator(pylab.NullLocator())
ax.yaxis.set_major_locator(pylab.NullLocator())
pyplot.savefig("test.png",
bbox_inches='tight',
transparent=True,
pad_inches=0)


and despite my efforts to have an image 1000 by 1600 I get one 775 by 1280. How do I make it the desired size? Thank you.

UPDATE The presented solution works, except in my case I also had to manually set the axes limits. Otherwise, matplotlib could not figure out the "tight" bounding box.

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