[Tig] Re: variable density optical

Dominic Case cased at atlab.com.au
Mon Oct 23 00:20:17 BST 2006

>If the film was negative, they'd just flip the polarity 
>and work with it that way.

OK, that works for the clipping idea to mask out dirt (and film grain, which
is the biggest contributor to ground noise in an optical soundtrack).

But it's not a total solution. Image spread in any optical soundtrack leads
to cross-mod distortion. When you are reading a print, the two generations
of image spread (neg and print) tend to cancel each other out, minimising
the distortion. That obviously won't happen if you are running the negative.

Though I guess you'd usually be reading the negative soundtrack because you
don't have a print - so there's not much that can be done about it. But
remember "just flipping the polarity" doesn't solve everything.
Dominic Case
Atlab Australia

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