Maintaing aspect ratio while saving a subplot in matplotlib

Question

Maintaining the aspect ratio while plotting is quiet easy. I was trying to save the subplot while maintaining the aspect ratio but things didn't turn out the way I expected. This is the original plot along with the code how it is generated:

f,ax = plt.subplots()
ax.plot(x_new, y_new, 'black')
ax.set_xlim(0, img.shape[1])
ax.set_ylim(0, img.shape[0])
x0,x1 = ax.get_xlim()
y0,y1 = ax.get_ylim()
ax.set_aspect(abs(x1-x0)/abs(y1-y0))
plt.gca().invert_yaxis()

I saved the subplot as:

extent = ax.get_window_extent().transformed(f.dpi_scale_trans.inverted())
f.savefig('ax_figure.png', bbox_inches=extent)

But when I read the saved figure and do plt.imshow(img), I get this:

What should I do to get the saved image as in the subplot?

dseuss · Accepted Answer · 2017-09-13 09:48:01Z

1

The problem is that imshow may change the aspect ratio of the image depending on your settings. To force imshow to use the image's aspect ratio use

plt.imshow(img, aspect='equal')

answered Sep 13, 2017 at 9:48

dseuss

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