I am not sure I completely understand the question but here goes...
if your question is "how to call a command-line tool from lua" (including
passing parameters) you have multiple examples her :
http://darktable.org/redmine/projects/darktable/wiki/LuaScripts
if your question is "how to get exif information out of an image" it's a
bit more complicated... There is no generic way to get a specific piece of
exif information but the most important fields (the ones that DT already
uses) are already accessible on the image objects in lua. The page
http://darktable.org/redmine/projects/darktable/wiki/LuaAPI#dt_lua_image_t
will give you all the info you need
hope this helps...
On Tue, Oct 21, 2014 at 11:22 AM, Ralf Ullrich <rullr...@web.de> wrote:
> Dear fellow dt users,
>
> I am using dt since a while now and the more I use the more I like it.
> Thanks to the developers for this great piece of software!
> I use dt not only for digital, but also for analog photography, where I
> scan my negative film with Canoscan and import it into dt afterwards. What
> I would like to do is running exiftool from within dt via lua and pass it
> arguments like CreationDate, Lens, LensModel, Aperture etc. Running
> exiftool isn't too complicated but how do I pass the arguments? How can I
> do this from within dt/lua? Hoes somebody done something similar to pint me
> in the right direction?
>
>
> Thanks a lot,
>
> Ralf
>
>
> --
> -------------------------------------------------------------
> Ralf Ullrich
>
>
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