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<svg height="345.6pt" version="1.1" viewBox="0 0 460.8 345.6" width="460.8pt"

<svg height="345.6pt" version="1.1" viewBox="0 0 460.8 345.6" width="460.8pt"

./base.py
identify base.png

fig.dpi = 100.0
fig.get_size_inches() = [6.4 4.8]
base.png PNG 640x480 640x480+0+0 8-bit sRGB 13064B 0.000u 0:00.000

./get_size.py 431

get_size.png PNG 574x431 574x431+0+0 8-bit sRGB 10058B 0.000u 0:00.000

./get_size.py 1293

main.png PNG 1724x1293 1724x1293+0+0 8-bit sRGB 46709B 0.000u 0:00.000

./width.py 431 869

width.png PNG 869x431 869x431+0+0 8-bit sRGB 10965B 0.000u 0:00.000

./width.py 431 869

width.png PNG 211x431 211x431+0+0 8-bit sRGB 6949B 0.000u 0:00.000

width.png PNG 211x431 211x431+0+0 8-bit sRGB 7134B 0.000u 0:00.000

./magic.py 431 231

magic.png PNG 431x231 431x231+0+0 8-bit sRGB 7923B 0.000u 0:00.000

./magic.py 1291 693

magic.png PNG 1291x693 1291x693+0+0 8-bit sRGB 25013B 0.000u 0:00.000

./set_size_inches.py 431 231

set_size_inches.png PNG 430x231 430x231+0+0 8-bit sRGB 8078B 0.000u 0:00.000

./set_size_inches.py 1291 693

set_size_inches.png PNG 1291x693 1291x693+0+0 8-bit sRGB 19798B 0.000u 0:00.000

./get_size_svg.py 431

get_size_svg.svg SVG 614x461 614x461+0+0 8-bit sRGB 17094B 0.000u 0:00.000

inkscape -h 431 get_size_svg.svg -b FFF -e get_size_svg.png

./base.py
identify base.png

fig.dpi = 100.0
fig.get_size_inches() = [6.4 4.8]
base.png PNG 640x480 640x480+0+0 8-bit sRGB 13064B 0.000u 0:00.000

./get_size.py 431

get_size.png PNG 574x431 574x431+0+0 8-bit sRGB 10058B 0.000u 0:00.000

./get_size.py 1293

main.png PNG 1724x1293 1724x1293+0+0 8-bit sRGB 46709B 0.000u 0:00.000

./width.py 431 869

width.png PNG 869x431 869x431+0+0 8-bit sRGB 10965B 0.000u 0:00.000

./width.py 431 869

width.png PNG 211x431 211x431+0+0 8-bit sRGB 6949B 0.000u 0:00.000

width.png PNG 211x431 211x431+0+0 8-bit sRGB 7134B 0.000u 0:00.000

./magic.py 431 231

magic.png PNG 431x231 431x231+0+0 8-bit sRGB 7923B 0.000u 0:00.000

./magic.py 1291 693

magic.png PNG 1291x693 1291x693+0+0 8-bit sRGB 25013B 0.000u 0:00.000

./set_size_inches.py 431 231

set_size_inches.png PNG 430x231 430x231+0+0 8-bit sRGB 8078B 0.000u 0:00.000

./set_size_inches.py 1291 693

set_size_inches.png PNG 1291x693 1291x693+0+0 8-bit sRGB 19798B 0.000u 0:00.000

./get_size_svg.py 431

get_size_svg.svg SVG 614x461 614x461+0+0 8-bit sRGB 17094B 0.000u 0:00.000

inkscape -h 431 get_size_svg.svg -b FFF -e get_size_svg.png

Summary of current status: things are messy, not sure if it is a fundamental limitation, or if the use case just didn't get enough attention from devs, I couldn't easily find an upstream discussion about this.

base.py

run:

outputs:

get_size.py

run:

outputs:

outputs:

width.py

run:

output:

output:

magic.py

run:

outputs:

outputs:

set_size_inches.py

run:

outputs:

so the height is slightly off, and the image:

outputs:

I could not find how to set it for SVG images, my approaches only worked for PNG e.g.:

get_size_svg.py

run:

and the generated output contains:

and identify says:

and if I open it in Chromium 86 the browser debug tools mouse image hover confirm that height as 460.79.

I use Inkscape instead of Imagemagick's convert here because you need to mess with -density as well to get sharp SVG resizes with ImageMagick:

Tested on matplotlib==3.2.2.

Summary of current status: things are messy, and I am not sure if it is a fundamental limitation, or if the use case just didn't get enough attention from developers. I couldn't easily find an upstream discussion about this.

base.py

Run:

Outputs:

get_size.py

Run:

Outputs:

Outputs:

width.py

Run:

Output:

Output:

magic.py

Run:

Outputs:

Outputs:

set_size_inches.py

Run:

Outputs:

So the height is slightly off, and the image:

Outputs:

I could not find how to set it for SVG images, my approaches only worked for PNG, e.g.:

get_size_svg.py

Run:

And the generated output contains:

And identify says:

And if I open it in Chromium 86 the browser debug tools mouse image hover confirm that height as 460.79.

I use Inkscape instead of ImageMagick's convert here because you need to mess with -density as well to get sharp SVG resizes with ImageMagick:

It was tested on matplotlib 3.2.2.