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Kodak TTAF/Aaton Keylink
Rob, David, Jeff and
Craig, Paul, Bill, Bob K, Bob F, Andy
The day we received a Kodak TTAF film we activated the built-in Keylink
CCIR601 digital keyer YUV sampler and wrote a few C++ lines to convert
these samples into RGB levels for the colorist, and into Printer Points
for the DPs and labs: the TTAF process worked beautifully. It is so
simple and straightforward that it will certainly be accepted faster than
the poor old TAF.
Obviously an 18% grey card will not be often seen at the start of takes
of documentary films, but it will be of great value for these DPs who
never know what YOU colorists (taxi driving or beer drinking, or both)
have done to THEIR light ! The big drawback of film video editing, i.e.
no workprint dailies for the DP to relax, will disappear.
Under the Aaton Keylink method, operations can be summarized as follows :
1st - Setting the TK & its Controller for TTAF calibration.
Keylink 601 simultaneously samples the black, grey & white TTAF patches
(that Kodak records on the same frame), and burns nine RGB digital
windows on the image of the patches themselves (see picture on Feb 16 96
Keylink V6.0 user manual) ; this helps trim these interdependant
parameters for the operator to converge quickly on the Kodak
densitometer-like settings. Once completed, this "TTAF Cal." is entered
into the DaVinci/Pandora memory for instant further recall (see under).
2nd - Day to day operation.
The colorist finds and hit the DP's grey card (WHATEVER ITS POSITION in
the picture frame) with a pointer driven by the KL keyboard arrow keys or
KL then samples the whole card surface under the recalled
DaVinci/Pandora "TTAF Cal." and converts the card RGB values into Printer
Points through look-up tables (the adequate rawstock look-up table is
auto loaded by the KL keycode reader itself).
At colorist's request PPs are burned into both the analog & digital
channels. They are recorded into the Keylink database for ATL/FLeX/FTL
list export. and they can be printed to be delivered with the dailies. .
The system will be shown - under its present version - working on an URSA
during the NAB 96. As this TTAF business really is at the root of the
colorist savoir-faire, we can expect a bunch of suggestions to be
implemented right after the show. Thus this software Keylink option
availability will probably be postponed to the end of April.
Jean-Pierre Beauviala / Aaton