computing the size of a tikz to png image during export

[Alan Schmitt <alan.schmitt@polytechnique.org>]

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Hello,

I use this great trick to have both a pdf and html export of tikz
images:

#+header: :file (by-backend (latex "tp6-tree.tikz") (t "tp6-tree.png"))
#+header: :imagemagick yes :iminoptions -density 600 :imoutoptions -geometry 800
#+header: :results file raw
#+header: :fit yes
#+header: :headers '("\\usepackage{tikz}")
#+begin_src latex
\begin{tikzpicture}
…
\end{tikzpicture}
#+end_src

If I understand how it works in the png case, a standalone latex file is
first generated, then it is compiled to pdf and converted to png using
imagemagick. Instead of specifying the geometry of the image (width of
800 pixels above), I would like to compute it using its original size.
Is it possible?

Thanks a lot,

Alan

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