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Re: Transfers, records and Repeatability.
- To: Veenotph at aol.com
- Subject: Re: Transfers, records and Repeatability.
- From: "Robert Lovejoy" <rlovejoy at bellatlantic.net>
- Date: Fri, 4 Jul 1997 10:29:37 +0000
- CC: telecine at xyzoom.alegria.com
- Comments: Authenticated sender is <rlovejoy at postoffice.bellatlantic.net>
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- Resent-Date: Fri, 4 Jul 1997 07:29:49 -0700 (PDT)
- Resent-From: telecine at sun.alegria.com
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> My question is this, when i take my negative to a telecine session, and then
> we set up the gray scale, and start correcting. Can the correction settings
> be saved? Can I shot something two weeks later, and walk into the telecine ses
> sion and say, I'd like to see The correction we did two weeks ago first (or
> bring a record of that correction with me), and then go from there? Can the
> individual sessions corrections be printed out, in terms of what correction
> for what footage.
A two week wait will not be a problem anywhere. On a Rank, the CRT
ages significantly over its lifespan. Two weeks would not be a
problem, but two months would show a noticeable difference. For this
reason, it is also necessary to return to the original transfer
facility, as other facilities' tubes would be in random states of
decay. There are so many variables on a telecine - resistors, caps,
transformers whose values drift over the lifetime of the device -
that a complete and viable standard cannot readily be achieved.
Printers are dealing with light bulbs while we have complex
electronic circuits to control.
If you are concerned about longer-term repeatability, I suggest
choosing a facility with a CCD telecine such as the Spirit. CCDs do
not drift over time as much as tubes and it is likely that their
corrections will hold much longer. Tube ageing is the most
significant reason for corrections having errors over time.
Modern color correctors also offer global correction ability, in
which a colorist may rebalance one scene to a still-stored image, and
the same correction will be applied to the entire list. This could
quickly return a corrupted-by-time set of corrections to viable ones.
It is unlikely that using this method will result in a 100 per cent
recovery of the original session.
> Is this what the calibration films that are coming out supposed to help
> accomplish? Or is it impossible to balance telecines to the same neutral day
> to day.
Yes, using these films regularly can help keep a telecine's day to
day neutrality, but that neutrality is only valid for that period of
adjustment. Your old corrections are still losing their accuracy as
the tube ages. It's just that the operator is keeping the telecine
adjusted for a standard as it is drifting away.
> I would really love to be able to see/have some kind of readout/printout.
> whatever, of the session. Just so I could have a better grasp of how the film
> is reacting to the Telecine, and Vice Versa.
I think the TOPSY had this! Ah, progress...
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