How to set the size of a figure in Python matplotlib

Question

Could someone tell me, why the size of the figure generated by the code below is not as expected.

How can I modify this code to generate a picture with 100*400 pixels?

import numpy as np
import matplotlib.pyplot as plt

fig  = plt.figure(figsize=(1,4),dpi=100,facecolor = 'red')
plt.show(fig)

the picture generated by this code have 218*409 pixels, and I don't konw why? — Sean Liu
– Sean Liu, Commented Mar 11, 2016 at 6:17
Good point. I tried (very small changes to your code) and got 100dpi and 120x398 pixels. Size is in inches and dpi is dots per inch, so you should get 100 x 400. — roadrunner66
– roadrunner66, Commented Mar 11, 2016 at 6:20
But see this page: http://stackoverflow.com/questions/332289/how-do-you-change-the-size-of-figures-drawn-with-matplotlib So this is a possible duplicate. — roadrunner66
– roadrunner66, Commented Mar 11, 2016 at 6:26

ssm · Accepted Answer · 2016-03-11 08:28:59Z

1

You should set the dpi during savefig

import numpy as np
import matplotlib.pyplot as plt

fig  = plt.figure(figsize=(1,4),facecolor = 'red', dpi=100)
plt.savefig('test.png', dpi=100)

plt.show(fig)

Of course, it wont be perfect, but will be close ..

edited Mar 11, 2016 at 8:28

answered Mar 11, 2016 at 8:20

ssm

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