How to get matplotlib figure size

Question

For a project, I need to know the current size (in pixels) of my matplotlib figure, but I can't find how to do this. Does anyone know how to do this ?

Handsel

Answer 1

import matplotlib.plt
fig = plt.figure()
size = fig.get_size_inches()*fig.dpi # size in pixels

To do it for the current figure,

fig = plt.gcf()
size = fig.get_size_inches()*fig.dpi # size in pixels

You can get the same info by doing:

bbox = fig.get_window_extent().transformed(fig.dpi_scale_trans.inverted())
width, height = bbox.width*fig.dpi, bbox.height*fig.dpi

Shingly

Thank you, it gives me the size of the figure when first plotted I think, but it does not actualize if I change the size of my window and re draw my figure :/ – Handsel

it does for me. I first turned interactive plotting on plt.ion(). I created a figure fig. size = fig.get_size_inches()*fig.dpi returned array([ 640., 480.]). I resized it and recalculated the size and got array([ 704., 270.]) – Shingly

Thanks, I will investigate this way so. I just need to turn interactive plotting on now in my FigureCanvas :) – Handsel

is fig.get_size_inches()*fig.dpi width or height? – Bulbul

@JosephGarvin both: fig_width, fig_height = plt.gcf().get_size_inches() – Sajovich

Answer 2

Maybe this animation might help:

Quondam

It should only illustrate the connection between dpi and figure_size, as an addition to the already good answer from Julien Spronck, however, If you don't find this useful, I can also remove this answer again. – Quondam

I think it would be useful and pretty cool if you put code. – Sajovich

here is the code: manimplotlib.readthedocs.io/en/latest/manimplotlib4.html – Quondam

Answer 3

Quickly extract figure size in inches

To get width and height in inches I just use:

fig_width, fig_height = plt.gcf().get_size_inches()
print(fig_width, fig_height)

I put this here because this question is the first result that pops up when you search 'get matplotlib figure size', and the api most naturally works in inches, not pixels.

Sajovich