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From: "Charles C. Berry" <ccberry@ucsd.edu>
Subject: Re: pdf images in html export
Date: Wed, 12 Nov 2014 11:03:50 -0800
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To: Andreas Leha <andreas.leha@med.uni-goettingen.de>
Cc: emacs-orgmode@gnu.org

On Wed, 12 Nov 2014, Andreas Leha wrote:

> Hi Rainer,
>
> Rainer M Krug <Rainer@krugs.de> writes:
>> Andreas Leha <andreas.leha@med.uni-goettingen.de> writes:
>>
>>> Hi Marco,
>>>
>>> Marco Wahl <marcowahlsoft@gmail.com> writes:
>>>> Andreas Leha <andreas.leha@med.uni-goettingen.de> writes:
>>>>
>>>>> how would I export an org file containing
>>>>>
>>>>>   [[file:./myimage.pdf]]
>>>>>
>>>>> to html so that a say png version myimage.pdf is inlined in the html
>>>>> which links to the pdf?
>>>>>

[deleted]

Andreas replying:

>
> Thanks for this.  I am aware of how to *produce* graphics in different
> formats for different export backends.  I use your first approach,
> which I think is the better solution.
>
> Here, I am after a solution, that works on images that are not produced
> but merely included via [[file:./some.pdf]].
>
> I think there should be the possibility to include these into html (and
> odt) export without any user interaction.  So, I
> - do not want to write a source block just to produce the by-backend image
> - do not want to change the link manually
> - do not want to run the converter manually
>
> I am pretty sure this should be achievable with standard orgmode tools
> (like filters, export hooks, or anything).
>
> Since 'this is coming again and again' it seems a non-esoteric task.
> And as there is 'no solution out of the box', I assume(d) that somebody has
> written these filters already.
>

What you want is a custom `hyperlink type'.

I don't know if anyone has written this, but the machinery is in 
`org-add-link-type'. You user would enter (say)

 	[[pdf:./some.pdf]]

and clicking on it would open the file (assuming a proper FOLLOW argument) 
and exporting would handle all the behind the scenes tinkering to 
create png's or whatever is needed for the backend in question (assuming 
a suitable EXPORT argument).

The docstring for `org-add-link-type' has details. Also there is a worked 
example and more instructions at

 	(info "(org) Adding hyperlink types")

HTH,

Chuck