John H. K. John H. K. - 1 month ago 14
Python Question

How to obtain the same font(-style, -size etc.) in matplotlib output as in latex output?

I have one

.tex
-document in which one graph is made by the python module
matplotlib
. What I want is, that the graph blends in to the document as good as possible. So I want the characters used in the graph to look exactly like the other same characters in the rest of the document.

My first try looks like this (the
matplotlibrc
-file):

text.usetex : True
text.latex.preamble: \usepackage{lmodern} #Used in .tex-document
font.size : 11.0 #Same as in .tex-document
backend: PDF


For compiling of the
.tex
in which the PDF output of
matplotlib
is included,
pdflatex
is used.

Now, the output looks not bad, but it looks somewhat different, the characters in the graph seem weaker in stroke width.

What is the best approach for this?

EDIT: Minimum example: LaTeX-Input:

\documentclass[11pt]{scrartcl}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage{graphicx}

\begin{document}

\begin{figure}
\includegraphics{./graph}
\caption{Excitation-Energy}
\label{fig:graph}
\end{figure}

\end{document}


Python-Script:

import matplotlib.pyplot as plt
import numpy as np

plt.plot([1,2,3,4])
plt.xlabel("Excitation-Energy")
plt.ylabel("Intensit├Ąt")
plt.savefig("graph.pdf")


PDF output:

enter image description here

Answer

The difference in the fonts can be caused by incorrect parameter setting out pictures with matplotlib or wrong its integration into the final document. I think problem in text.latex.preamble: \usepackage{lmodern}. This thing works very badly and even developers do not guarantee its workability, how you can find here. In my case it did not work at all.

Minimal differences in font associated with font family. For fix this u need: 'font.family' : 'lmodern' in rc. Other options and more detailed settings can be found here.

To suppress this problem, I used a slightly different method - direct. plt.rcParams['text.latex.preamble']=[r"\usepackage{lmodern}"]. It is not strange, but it worked. Further information can be found at the link above.


To prevent these effects suggest taking a look at this code:

import matplotlib.pyplot as plt

#Direct input 
plt.rcParams['text.latex.preamble']=[r"\usepackage{lmodern}"]
#Options
params = {'text.usetex' : True,
          'font.size' : 11,
          'font.family' : 'lmodern',
          'text.latex.unicode': True,
          }
plt.rcParams.update(params) 

fig = plt.figure()

#You must select the correct size of the plot in advance
fig.set_size_inches(3.54,3.54) 

plt.plot([1,2,3,4])
plt.xlabel("Excitation-Energy")
plt.ylabel("Intensit├Ąt")
plt.savefig("graph.pdf", 
            #This is simple recomendation for publication plots
            dpi=1000, 
            # Plot will be occupy a maximum of available space
            bbox_inches='tight', 
            )

And finally move on to the latex:

\documentclass[11pt]{scrartcl}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage{graphicx}

\begin{document}

\begin{figure}
    \begin{center}
        \includegraphics{./graph}
        \caption{Excitation-Energy}
        \label{fig:graph}
    \end{center}
\end{figure}

\end{document}

Results

Zoom of pdf document

As can be seen from a comparison of two fonts - differences do not exist (1 - MatPlotlib, 2 - pdfLaTeX) Comparison of fonts

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