Increase dpi in matplotlib chart without changing it's size

Question

I'm trying to create a pdf using Python's reportlab module. I generated a png with matplotlib and saved it in the pdf file using report labs canvas.drawImage method. My problem is that the generated png file is very fuzzy. I specified the size in inches with plt.figure(figsize=(20,10)) and saved the picture with the plt.savefig method.
This works out perfectly (except the fuzzy quality of the picture).
But when I increase the dpi within the savefig method the size of the picture increases.
Is there any way to improve the dpi without changing the picture size. Or is there a way to resize it to the predefined values?

Thanks!

To understand the Relationship between dpi and figure size.

ImportanceOfBeingErnest
– ImportanceOfBeingErnest

2018-12-18 09:23:08 +00:00
Commented Dec 18, 2018 at 9:23 — ImportanceOfBeingErnest
– ImportanceOfBeingErnest, Commented Dec 18, 2018 at 9:23

jason m · Accepted Answer · 2018-12-17 18:56:35Z

2

f = df.plot()
fig = f.get_figure()
fig.set_size_inches((2,2))
fig.savefig('C:/temp/foo.png', bbox_inches='tight', dpi=1500)

answered Dec 17, 2018 at 18:56

jason m

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2 Comments

j. DOE Over a year ago

Hi, thanks for the quick response. Unfortunately it doesn't work. The picture of the chart is still increasing in size when I increase the dpi. If I use your method and set it to 100 instead of 1500 I get the same resulst as before.

jason m Over a year ago

matplotlib.org/api/_as_gen/matplotlib.pyplot.savefig.html - that is not what should happen.

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