Is it possible to extract TikZ diagrams as image files?

Question

I’m using TikZ to draw diagrams in LaTeX that I then want to isolate as image files to put online. I’m using TeXnicCenter to edit the sources.

Is there is a way to extract these diagrams directly without having to extract them from the finished PDF file?

Solution 1

Following up on my comment: Cirkuit converts TikZ diagrams into images by running something like the following sequence of commands:

pdflatex img.tex
pdftops -eps img.pdf
convert -density 300 img.eps img.png

Here img.tex would be a LaTeX file that follows this template:

\documentclass{article}
\usepackage{tikz,amsmath,siunitx}
\usetikzlibrary{arrows,snakes,backgrounds,patterns,matrix,shapes,fit,calc,shadows,plotmarks}
\usepackage[graphics,tightpage,active]{preview}
\PreviewEnvironment{tikzpicture}
\PreviewEnvironment{equation}
\PreviewEnvironment{equation*}
\newlength{\imagewidth}
\newlength{\imagescale}
\pagestyle{empty}
\thispagestyle{empty}
\begin{document}
\begin{tikzpicture}
    % (your TikZ code goes here)
\end{tikzpicture}
\end{document}

If you are able to use Cirkuit or a similar editor, or write a script for yourself to put your diagram into that template and run the appropriate tools, you'll have a quick way to convert TikZ code into a PNG image.

To answer your question more directly... no, I don't know of any way to convert a TikZ diagram directly to PNG without going through a PDF file (or at least DVI) at some stage.

Solution 2

I would recommend the following approach. Place the TikZ picture in question in a separate file and use the standalone class to compile it standalone. It uses the preview package mentioned in the other answers. To include the picture in the main document, load the standalone package there first and then use the \input command on the picture file.

This will allow you to get a single PDF of the TikZ picture without margins. Then you can use, say, a PDF-to-PNG converter to get a PNG (recommended for web publishing of drawings). The SVG format would be nicer, because it’s a vector format, but not all browsers might be able to display it.

Here some example code. The TikZ picture file (e.g., pic.tex):

\documentclass{standalone}
\usepackage{tikz}
% all other packages and stuff you need for the picture

\begin{document}
\begin{tikzpicture}
% your picture code
\end{tikzpicture}
\end{document}

The main document:

\documentclass{article} % or whatever class you are using
\usepackage{standalone}
\usepackage{tikz}
% All other packages required
\begin{document}
% Text text text
% somewhere where you want the tikz picture
\input{pic}
% Text text text
\end{document}

Then compile the picture and convert it, e.g., with ImageMagick:

pdflatex pic
convert -density 600x600 pic.pdf -quality 90 -resize 800x600 pic.png

or try SVG:

convert pic.pdf pic.svg

Solution 3

See the TikZ manual section “Externalizing Graphics”. This lets you make EPS or PDF versions of your graphics. I use EPS files, convert them to TIFFs and can then put them wherever I need to.

Solution 4

I'm generally using something along these lines:

\documentclass{article}
\usepackage[pdftex,active,tightpage]{preview}
%\setlength\PreviewBorder{2mm} % use to add a border around the image
\usepackage{tikz}
\begin{document}
\begin{preview}
\begin{tikzpicture}
    \shade (0,0) circle(2); % background
    \draw (0,0) circle(2);  % rim
    \draw (.75,1) circle(.5);   % right eye
    \fill (.66,.9) circle(.25); % right pupil
    \draw (-.75,1) circle(.5);  % left eye
    \fill (-.66,.9) circle(.25);% left pupil
    \fill (.2,0) circle (.1);   % right nostril
    \fill (-.2,0) circle (.1);  % left nostril
    \draw (-135:1) arc (-135:-45:1) -- cycle; % mouth
  \end{tikzpicture}
\end{preview}
\end{document}

The pdf file generated contains the standalone TikZ picture. To convert it to any other file format, simply open it with Gimp.

Solution 5

Windows: Just to be completely explicit for noobs like me

Use the prewiew package as Habi suggested in the above in your latex code to remove margins.

Install MIktex and Inkscape and use the following bat file:

cd = "C:\Path to tex"
pdflatex input-file-name.tex
"C:\Program Files (x86)\Inkscape\inkscape.exe" input-file-name.pdf --export-plain-svg=output-file-name.svg

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Comments

[Admin]

Thanks! All I wanted to avoid was having to manually isolate the diagrams, so this should work fine.

[Glutanimate]

I've found pdf2svg to be a more reliable tool for converting PDF to SVG than imagemagick.

[Martin Scharrer]

@Glutanimate: In the meantime I started to use inkscape for it.

[user4035]

@MartinScharrer I was able to embed pdf file into the parent document, without converting it to png or svg: \includegraphics{file_name.pdf}

[Martin Scharrer]

@user4035: Sure, that's the normal way to inlcude PDFs into your (pdf)LaTeX document. However, this question is about how to get the diagrams as raster image files so that they can be displayed online.

[Alex Hirzel]

As of 2013, I think this is probably the best approach.

[Yaroslav Nikitenko]

In 2017 this is section 50.4 (page 607) of the pgfmanual. It seems we can't give the link to a web page for the section (it's only in pdf). :(

[Eike P.]

Theoretically, this works nicely. In practice, after using tikzexternalize for quite a while, I have reverted to the standalone approach, because just seems easier to get it working. I've had quite a bit of a hassle with tikzexternalize.