[Matplotlib-users] Exporting plot with given scale and DPI

[Jody Klymak]

Does `fig.set_size_inches()` do what you want?

Cheers,   Jody

> On 8 Jan 2018, at 08:44, Alexander Bruy <alexander.bruy at gmail.com> wrote:
> 
> Hi all.
> 
> I use matplotlib inside PyQt app and want to export plot into PNG image with
> some user-defined scale and DPI. So after printing that image I should be able
> to measure on the paper according to the scale.
> 
> For example, length of the profile line is 500m (this is my x-axis),
> scale set to 1:10000 and DPI is 150. 500m at 1:10000 should result in
> a 5cm print out. Taking 150 DPI into account resulting bitmap should
> be 295 pixels wide:
> 
> 1cm is 0.393701 inches
> 5cm is 1.968505 inches
> 1.968505inches * 150DPI = 295.27575 px
> 
> Also it is necessary to take into account that resulting image may be
> really big, for
> example if profile line length is several kilometers and DPI is 600.
> 
> As I can see there is a 'dpi' parameter in the savefig() call, but I
> can't figure out how
> to adjust size of the existing figure when exporting. Can you help me?
> 
> Thanks
> -- 
> Alexander Bruy
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--
Jody Klymak    
http://web.uvic.ca/~jklymak/