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

TAF & SUCH



> 
> Jean:
> 
> It was with great interest that I read you messages regarding TAF's,
> alignments, etc.
> 
> Here is how I did it. (I DO NOT intend on putting myself in as
> position as one who can set a standard,  but one who has ridden this
> bucking bronco subject (TAF) for more years than I would be willing to
> admidt to.)
> 
> I am an engineer, not a colorist.  From an engineering point, I MUST
> deal in RGB.  I hear film people talk in YEL/CYAN/MAGENTA.  It is like
> a Greek trying to talk to an Arab.  Each knows what he is saying, but
> the other can't understand fully.  Back to engineering.  I veiw
> setting up the RANK with the best REFERENCE STARTING POINT, as my main
> goal.  With TAF's of the past, the reference starting point made
> client films look over-exposed and green, (a real public relations
> nightmare).  The Chicago Production houses got so fed up, they made
> their own TAF, The Chicago TAF.  That was better, but not perfect..
> I'm now using a piece of experimental film I received from Kodak a
> year or so ago, which is referred to as the "U" chart, I am told.
> It has a ACCURATE 12 step grey scale chart, some color chips, and two
> ladies wearing black and white.  It is the most accurate piece of film
> I have ever set up on... The colorists LOVE IT.
> 
> Back to engineering talk...  WHAT WE NEED IS A ROSETTA STONE!
> Something that will bridge the film and video worlds together so that
> the two of us (film-types, video-types) can both speak the same
> language.  I'm not a film knowledgeable person, but from the video
> side, I would believe an perfect 11 step greyscale chart would do
> nicely.  11 steps, one for each 10 IRE of component video...
> Seeing that engineers have no choice but to deal in RGB, and since
> the hardest thing for cameras to do is B&W (and telecines ARE
> cameras!).  Therefore if a 11 step greyscale could be produced with
> the blackest being black(0IRE COMPONENT), the whitest being
> white(100IRE COMPONENT), and the greyscales being fairly linear on all
> steps, THEN a film and video person COULD DISCUSS what we are seeing
> in terms we BOTH could understand.
> 
> This is approximately what the "U" chart has done for us, and it has
> been the closest film to a "reference" that I have seen.
> Sorry for being so wordy...  Jan