Hi Mario,

You can use `dot.*` as a filename.
refs:
http://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#images
```
Dear reader, behold :numref:`Fig %s <fooBar>`.

.. _fooBar:

.. figure:: docgraphs/dot/dot.*
   :figwidth: 80 %
   :width: 80 %
   :align: center
```

This provides `dot.svg` for html and `dot.png` for latex.
Please refer supported_image_types attribute in the bellow page. You can
get the supported image format for each builders.
http://www.sphinx-doc.org/en/master/builders.html

Regards,

On Fri, Mar 9, 2018 at 12:24 AM Mario S. Mommer <[email protected]>
wrote:

> Hello,
>
> with Sphinx v1.5.5, I want to reference a figure by number. At the same
> time, I want to have different image formats for html or for latex.
> While I can get each feature to work, I haven't been successful at
> getting the combination to work.
>
> The following works, of course:
>
> =============
> Dear reader, behold :numref:`Fig %s <fooBar>`.
>
> .. _fooBar:
>
> .. figure:: docgraphs/dot/dot.png
>    :figwidth: 80 %
>    :width: 80 %
>    :align: center
>
> =============
>
> With conditionals it looks like follows (and does not work)
>
> =============
> Dear reader, behold :numref:`Fig %s <fooBar>`.
>
> .. _fooBar:
>
> .. only:: latex
>
>    .. figure:: docgraphs/dot/dot.png
>       :figwidth: 80 %
>       :width: 80 %
>       :align: center
>
> .. only:: html
>
>    .. figure:: docgraphs/dot/dot.svg
>       :figwidth: 80 %
>       :width: 100 %
>       :align: center
>
> ================
>
> It says "WARNING: undefined label:foobar"
>
> An alternative does not work, either:
>
> =============
> Dear reader, behold :numref:`Fig %s <fooBar>`.
>
> .. only:: latex
>
>    .. _fooBar:
>
>    .. figure:: docgraphs/dot/dot.png
>       :figwidth: 80 %
>       :width: 80 %
>       :align: center
>
> .. only:: html
>
>    .. _fooBar:
>
>    .. figure:: docgraphs/dot/dot.svg
>       :figwidth: 80 %
>       :width: 100 %
>       :align: center
>
> ================
>
> Here it says fist
>
> WARNING: Duplicate explicit target name: foobar
>
> and then
>
> WARNING: undefined label: foobar
>
> How can I place the labels correctly? Any ideas / advice?
>
> Regards, and thanks,
>
>         Mario
>
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