26 May
2017
26 May
'17
12:30 p.m.
> Fortuitously, the B&W film was sharp enough to
be able to make out the dot
> mask of the CRT! That made possible the development of a new technique -
> computer recognition of which pixels were the original RGB dots of the image!
> That, unlike manual colorisation, results in reasonably exact recreation of
> the original colors.
On Fri, 26 May 2017, Peter Corlett wrote:
I don't know if you're describing yet another
way colour was retrieved from
telecine recordings,
possibly
or a faulty recollection of the detail of James
Insell's
work at BBC R&D.
much more likely.
Thank you.
My information is fourth hand, from something discussed on a TV talk show.
(typical unreliable source!)
James's moment of inspiration was when he was
watching some old Doctor Who
telerecordings that had been telecined back and had caused what appeared to be
artifact colour. He realised that the film recording contained enough detail to
capture the colour subcarrier.
The bit that was combined genius and perspiration was figuring out the phase of
the colour signal, since the colour burst never made it into the recording.
Without that, one can't reliably separate U from V and the hue will be
essentially random.
http://icolorist.com/dr-who-restoration-by-enthusiasts/
http://www.techmind.org/colrec/
Have some discussion of details.
We should be grateful that they developed those RE-colourisation
techniques and didn't stick with the USA ("Legend"?)
computer assisted manual Ted Turner style colorization.
--
Grumpy Ol' Fred cisin at xenosoft.com