Eric,

Thanks a lot for your answer it works with the following updates

--8<---------------cut here---------------start------------->8---
#+begin_src dot :file test.png
digraph test {
A -> B
}
#+end_src


#+attr_latex: :width .5\linewidth
#+RESULTS:
[[file:test.png]]
--8<---------------cut here---------------end--------------->8---

Kind regards.


--
Juan Amiguet Vercher
Practising theorist
All-round geek
Polyglot polymath

+41(0)774867913

On Mon, Oct 2, 2017 at 12:26 PM, Eric S Fraga <esflists@gmail.com> wrote:

> On Monday,  2 Oct 2017 at 08:46, Juan Amiguet wrote:
> > Dear all,
> >
> > I have been having this issue for quite a while perhaps I am using the
> > feature wrong and someone can enlighten me or perhaps someone can point
> me
> > at the bit of code I can patch it myself.
> > Here is the issue:
> >
> > I have a babel block such as
> >
> > #+begin_src dot :file test.png
> > digraph test {
> > A -> B
> > }
> > #+end_src
> >
> >
> > This will create after execution a
> >
> > #+RESULT:
> > [[file:./test.png]]
> >
> > Now if I would like have something like :width .5/.linewith as a
> attribute
> > to the image the only I have found is to do the following
> >
> > #+begin_src dot :file test.png :exports none
> > digraph test {
> > A -> B
> > }
> > #+end_src
> >
> > #+attr_latex: width=.5/linewidth
> > [[file:./test.png]]
> >
> > Is there a way of passing the export attributes to babel blocks in a way
> in
> > which from direct rendering of the document things work and I can adjust?
> > If now which part of the org mode codebase controls all of this?
>
> Simply add the attr_latex line to just before the #+result line and any
> re-evaluation of the src block will work just fine.  I.e.:
>
> --8<---------------cut here---------------start------------->8---
> #+begin_src dot :file test.png
> digraph test {
> A -> B
> }
> #+end_src
>
> #+attr_latex: width=.5/linewidth
> #+RESULT:
> [[file:./test.png]]
> --8<---------------cut here---------------end--------------->8---
>
> --
> : Eric S Fraga via Emacs 27.0.50, Org release_9.1.1-78-gfbf47c
>