Frank Davis wondered how digital info was transferred to film.
Before images can be digitally treated the film has to be scanned using
some kind of optical or laser process to translate the picture information
into digital format.
Computer Film Company in London (CFC) uses an optical process to scan the
negative or positive film frames and then can manipulate the resultant
image on their proprietary computer platform. This is done at resolutions
much higher than videotape and is not in any sense video. At the digital
compositing stage images can be combined, altered, recoloured, decoloured
and manipulated in a myriad of ways. When the producer/director are happy
with the result the output is scanned back onto film in a reverse of the
original digitizing process.
Kodak have developed a similar system but use laser scanning and writing
back to film.
The scane rates are about 2-3 seconds per frame. Projected film travels at
24 frames per second so it takes 48-72 seconds per second of screen time to
scan or write the material.
At the manipulation stage there are numerous platforms now being used.
Flame is an American device being used in features and TV commercials. You
may have seen an NFL ad which places Dennis Hopper on the field of play in
a game dressed as an umpire.
There will be literature around on the subject - try the Academy in Hollytown.
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