CODEWITHSUNDEEP
pythonmatplotlibplot
MaxPowers
MaxPowers

Reputation: 5486

High quality plots in matplotlib

I try plot some time series in high quality but matplotlib fails to save the figures in high quality. In the plotting the output looks like in the picture below, which is a screenshot.Picture 1

But using plt.safefig() or the save button gives me the following resultPicture

The core of the problem is that I have to save plots using the png-backend. Safing as pdf, a file is created, which can not be opened by other apps. Even though the files are < 500 kb. The same happens when safing as .eps. My code is like:

fig = plt.figure(1, figsize=(10, 6))
ax = fig.add_subplot(111, autoscale_on=True, ylim=(-1,1))
ax.plot(sig_obj, '-k', alpha=.3)
# plot of vertical lines ...
plt.savefig('figure_1.png')    # or .pdf

where sig_obj is an array of length > 350000. Using Python 3.4 and matplotlib 1.3.3 on OS X 10.9.4.

Does anyone have an idea to improve my plot quality?

Upvotes: 2

Views: 5748

Answers (1)

Adobe
Adobe

Reputation: 13467

You can either set a high dpi for a raster image:

savefig("1.png", dpi=600)

or save it in a vector format:

savefig("1.svg") # or: "1.pdf" (depending on a backend)

Upvotes: 7

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