[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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 
track ball.  
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