Adapt matplotlib-pgf example to image given by imshow ?

[jowe19]

Hi,
It's all in the title, I think. Currently it is possible to add graphs without external files using the io module. Is it possible to do the same with images from imshow?

I tried some naive things but it doesn't work (and I don't know io at all).

Thanks for your help.

\documentclass{article}

\usepackage{pyluatex}
\usepackage{unicode-math}
\usepackage{pgf}
\usepackage{url}

\title{PyLuaTeX Example -- Matplotlib PGF}
\author{Tobias Enderle}

\begin{document}

\maketitle

In this document we demonstrate how \emph{matplotlib} plots can be generated and
included in a document. In the Python code in this document, the plot is
configured and saved to PGF\footnote{\url{https://ctan.org/pkg/pgf}} code.
The PGF code is then included in the document and creates the plot.

To avoid intermediate files, the PGF code is saved into an in-memory file
using the Python \verb|io.StringIO| class%
\footnote{\url{https://docs.python.org/3/library/io.html#io.StringIO}}.

\begin{center}
\begin{python}
# example based on
# https://matplotlib.org/stable/gallery/lines_bars_and_markers/simple_plot.html
import matplotlib.pyplot as plt
import numpy as np
import io

Im = plt.imread('crayons.jpg') # un tableau numpy
plt.imshow(Im[:,:,1], cmap = 'gray')

with io.StringIO() as file:  # save to "in-memory file"
    plt.savefig(file, format='pgf', bbox_inches='tight', pad_inches=0.1)
    print(file.getvalue())
\end{python}
\end{center}

For an alternative approach of creating plots with \emph{matplotlib},
consider the example \verb|matplotlib-external.tex|.

\end{document}

[tndrle]

Hi,

this is possible with PGF because PGF is basically text commands LaTeX understands. So you can include them in the document directly. Are you able to output PGF with imshow? If not, what image format does it generate?

If the zip file you included contains anything crucial, please try to include it in your post directly. I will not open a zip file.

Best

[jowe19]

Hi,
Thank you for your reply. I updated my message, with an example of a tex file and an image, out of the zip.

[tndrle]

Hi, thanks for extending your post. When I compile it, I get the Python error

ValueError: streamed pgf-code does not support raster graphics, consider using
the pgf-to-pdf option

I'm not an expert on this, but I guess PGF output is not supported for raster graphics.
PGF is for vector graphics. I don't see a way of including raster graphics into LaTeX
without external files.

See also
https://tex.stackexchange.com/questions/47341/can-you-embed-an-image-so-it-doesnt-need-to-be-stored-as-a-separate-file
and
https://tex.stackexchange.com/questions/162013/can-i-bundle-images-in-the-source-file?noredirect=1&lq=1