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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