Sorry, I finally found a solution by myself :)

Using a minipage instead of a scalebox tolerates the \begin{center} that is automatically inserted:

#+LATEX: \center \begin{minipage}[c]{.85\textwidth}
#+INCLUDE: ./test.dot src dot :file test.png
#+LATEX: \end{minipage}

However, if someone has a pure/clean org-mode solution, I would love to learn it :)

On 3/30/22 11:07, Guillaume MULLER wrote:
> Dear all,
> 
> Thanks for org-mode, it is so perfect :)
> 
> I'm currently fighting with a problem that I cannot find a solution to (either on my own or with help on the web). If someone could help me, I would be very thankful.
> 
> I have an org-mode file that "includes" ane xternally generated image, like so:
> 
> #+INCLUDE: ./test.dot src dot :file test.png
> 
> The thing is the resulting image is too big. So I want to resize it.
> 
> I've tried several things that did not work:
> - add #+ATTR_LATEX: :width xxx before the #+INCLUDE
> - add :width xxx or :scale xxx on the #+INCLUDE line itself
> - ...
> 
> Thus I resolved to use plain LaTeX code with something like:
> #+LATEX: \center \scalebox{.85}{%
> #+INCLUDE: ./test.dot src dot :file test.png
> #+LATEX: }
> 
> Then the problem is that #+INCLUDE adds a \begin{center}\end{center} around the image inclusion, and \scalebox{} does not like that, making the resulting .tex file not compile ("perhaps missing \item").
> 
> Again, I've tried several unsuccessful things :
> - add #+ATTR_LATEX: :center nil before the #+INCLUDE
> - add :center nil on the #+INCLUDE line itself
> - ...
> 
> If anyone has an idea how a can solve the problem of resizing a #+INCLUDE'd image, either in plain org or with a LaTeX "warkaround", I would be very grateful.
> 
> Thanks !
>  
> Guillaume MULLER, PhD

-- 
Guillaume MULLER, PhD