I doubt this will be implemented in the GUI. I asked the same a few months
back (there are more such occasions, Levels and especially white balance
comes to mind). I got a pretty strong response from the developers that
they don't consider this useful. I since learned that this is probably the
end of the road.
On Wednesday, December 4, 2013, Stéphane Gourichon wrote:
> Hello,
> Introduction Darktable is really nice and satisfies most needs (well, my
> needs anyway).
> I had a little issue when shooting a bunch of pictures (say, dozens to
> hundreds) with varying light conditions.
>
> Due to time constraints (e.g. sport/action situation), the batch of
> pictures may have varying exposures. For example, I might have let the
> camera auto-exposure for most shots, but used exposure bias -1.0 starting
> with shots that had much contrast or backlight to avoid digital clipping,
> then let it through while I was shooting more normal shots with normal
> contrast and no backlight. The result is a set of pictures with varying
> gaps between actual exposure and ideal exposure.
> Wished behavior In those cases, it would be nice to apply darktable
> auto-exposure in batch.
>
> In practice, I expected that "copy development" from a photo that has had
> auto exposure, then "paste" that to some or all photos would trigger
> auto-exposure computation for those photographs.
>
> Such a feature would allow to "level" the set of pictures. This of course
> does not forbid quickly visually check if any of them needs more
> adjustments (since darktable doc says that this feature is not considered
> rock-solid, though it has worked very well in my use).
> Observed behavior I tried to just "copy development" from a photo that
> has had auto exposure it copies the particular parameters for the source
> photo (for example exposure +1.23EV which lightens). Then "pasting" that to
> other photos just applies the same value (for example lightening all
> photographs, even those that were ok or even overexposed already).
> It does not trigger an auto-exposure computation for destination pictures.
> Workaround So, at the moment I have no choice other than (on small sets)
> walk the whole list and tick "auto exposure" on every photo. On big sets,
> just open those which really stand out for wildly different exposure and
> apply "auto exposure" to them.
> Additional information Of course I googled first and checked the wiki.
> I asked on IRC, where LUA scripting was mentioned, but would it make easy
> to implement that wish, like a
> script<http://darktable.org/redmine/projects/darktable/wiki/LuaScripts>that
> could be applied on all pictures ?
>
>
> Any hint ?
>
> Thank you for your attention.
>
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