Accordingly to my friend who was the lab manager for the King Kong
movie, the prevalent approach is to shoot on film, digitalize it,
edit on computer and then re-expose back onto film.
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You have the production work-flow exactly right for the majority of
theatrical films! Even if a film is released in digital format to
some theatres, there are still hundreds (if not thousands) of film
prints also released. Otherwise the film could not be exhibited
world-wide. Also, some few films that are shot digitally, are
released on film! in addition to digital media. Even some movies
and productions intended only for television are shot on film
still. Film is quite alive.