I was trying to embed tikzpicture code in my org files. But fount that whenever I want to output the latex source code written to generate a picture, I was only able to do it when the :file option is set to svg. It will give not authorized error for png files.

For example, I have the following code blocks in my org file:

#+name: 2.24-list-tree
#+header: :fit yes :iminoptions -density 600 :imoutoptions -geometry 400
#+begin_src latex :file ./images/2.24-tree.png
\begin{tikzpicture}
\node {root}
child {node {1}}
child {node {(2 (3 4))}
child {node {2}}
child {node {(3 4)}
child {node {3}}
child {node {4}}
}
};
\end{tikzpicture}
#+end_src


and it never generates the file. Later I found that the issue is with the debian version of the package imagemagick. In order to re-enable us to generate png files, do the following:

1. Switch to root user
2. Edit file /etc/ImageMagic-6/policy.xml
3. Replace <policy domain="coder" rights="none" pattern="PDF" /> with
1. Save it.

Now we should be able to generate png files just fine.

I found the solution here.

Updated: