# [Matplotlib-users] physical size of plot

Benjamin Root ben.v.root at gmail.com
Wed Mar 8 11:34:01 EST 2017

```The figures in the gallery and documentation might also be automatically
cropped to eliminate white space.

On Wed, Mar 8, 2017 at 10:15 AM, vincent.adrien at gmail.com <

> Hello Jean-Philippe,
>
> you can use the `figsize` keyword argument when creating a figure to set
> its size in inches (1 in = 2.54 cm). You can also set the DPI value
> directly with the `dpi` argument. Or you can wait until saving the
> figure: the keyword argument is the same.
>
> For example
> ```python
>
> import matplotlib.pyplot as plt
>
> # Set the dimensions that you want in inches,
> # here let's say a quarter of a A4 sheet.
> a4_sheet = (21.0, 29.7)  # in cm
> my_size = [0.5*val/2.54 for val in a4_sheet]  # converted in inches
>
> fig, ax = plt.subplots(figsize=my_size)  # one could add 'dpi=300'
>
> ax.plot([0, 1, 2], [1, 2, 0])  # dummy plot
>
> # Saving with a specific dot-per-inch (dpi) value, here 300
> # Given my_size, the final picture should be ~ 1240x1754
> fig.savefig('my_figure_in_300_dpi.png', dpi=300)
>
> ```
>
> You may find more details in the online documentation:
> -
> [pyplot.figure](http://matplotlib.org/api/pyplot_api.
> html?highlight=figure#matplotlib.pyplot.figure)
> -
> [pyplot.savefig](http://matplotlib.org/api/pyplot_api.
> html?highlight=savefig#matplotlib.pyplot.savefig)
>
> I hope this helps.
>
> Regards
>
>
> PS: the figure size that you report is a bit surprising. The 2.0
> defaults are expected to produce 640×480 pixel-pictures (if I am not
> wrong).
>
> On 08/03/2017 15:19, Jean-Philippe Grivet wrote:
> > Hello,
> >
> > I use python(3.6)+numpy+matplotlib(2.0) (Anaconda distribution under
> > Win7) to draw simple figures and I meet the following problem. All the
> > figures that I plot come out the same size (432x288 px). This is OK for
> > simple curves but leads to obscure plots in more complicated cases.
> > I notice that all figures in the pyplot tutorial have size 550x450 as
> > they do also in the Matplotlib examples, while many figures in the
> > gallery are 165x135.
> >
> > How canI force the size of a picture in order to display it full screen
> > or to cover most of anA4 sheet of paper ?
> >
> > Thank you for your help
> > JP Grivet
> >
> >
> > ---
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> >
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>
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