[Matplotlib-users] The dpi set is useless in my picture when using matplotlib

tanweiwei at pku.edu.cn tanweiwei at pku.edu.cn
Sun May 15 11:02:17 EDT 2016

I am learing to use matplotlib to produce high quality picture for my paper. The demand dpi of this magzine is 300. 
So, I wrote some example codes:
import numpy as np
import matplotlib.pyplot as plt
a = np.linspace(0, 10, 100)
b = np.linspace(0, 20, 100)
plt.plot(a, b, 'o')
plt.savefig('fig1.jpg', dpi=300, format='jpg')
But I got a picure whose dpi is 72, and its size is 2400*1800. I'm confused about this outcome. I searched the Internet and some references about dpi setting, but I can't solve this problem anyway.
Also I tried those:
matplotlib.rcParams['savefig.dpi'] = 300
in this file, make
All of those is useless. 
I think the reason why the size of produced figure is 2400*1800. Because (300dpi*8 inches)*(300dpi*6 inches). The default size of figure in rc file is 8 inches and 6 inches. But why the dpi of this figure can't be changed!
My operating system is windows 10. Anaconda 3 helped me to install matplotlib module.
Thank for your help!

Weiwei Tan
Institute of Heavy Ion Physics
School of Physics,Peking University 
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