[Matplotlib-users] how can i raise the dpi without changing the dimensions of my picture?

[Bradley C. <col...@se...>]

Hi there, I make a figure, then I do some stuff, then I save the figure.

stuff
fig = figure(figsize = (0.75, 3.5))
stuff
fig.savefig(‘name.png’, bbox_inches='tight')

My figure is perfect, but I'm having trouble increasing the resolution. 
There are two ways that I can figure out to do that, one is send a dpi as an
argument to figure() and the other to savefig().  Sending it to figure()
doesn’t change the file at all, so I'm not sure what it does, but sending it
to savefig() does change the file.  When I send dpi to savefig(), like
dpi=500, the resolution seems to get much better, and the file size grows,
but the problem is that the height and width of the picture grows too.  I
want the resolution to go up, but not the height and width of the picture. 
What can I do?

Thanks!
Bradley