[QuadList] OT—How to reduce or eliminate moiré patterns from kinescopes?

[Ted Langdell]

Thanks, David.

Do you know how it works or where in the image/signal path it's  
installed?

Sounds like something that changed the scanning on the Rank's CRT so  
that there were more scan lines coming from it, and beating would be  
less of a potential problem.

Ted

On Mar 13, 2009, at 11:11 PM, David Keleshian wrote:

> Dave Walker used a system that doubled the scan lines and with a  
> little phase tweaking would eliminate the more'.
>
> The system was called "Clearview" It is installed on the telecine  
> at CBS, it works well.
>
> Dave Keleshian
> CBS TVC
>
>
> From: Ted Langdell <ted at quadvideotapegroup.com>
> To: Quad List <QuadList at quadvideotapegroup.com>
> Sent: Friday, March 13, 2009 11:03:42 PM
> Subject: [QuadList] OT—How to reduce or eliminate moiré patterns  
> from kinescopes?
>
> Howdy from Elko, NV, heading west...
>
> While at an archive in Salt Lake City (that has Quad and nothing to  
> play it on) I had a chance to run a monochrome negative kinney on  
> the flashtransfer yesterday.
>
> Surprisingly sharp, the scan lines in the kinney and the scan lines  
> in the telecined image caused cyclical moiré, with color fringing  
> on horizontal lines during the moiré cycle.
>
> Looked like a Nike Swoosh at the top of the moiré... and just  
> beating of the lines below that.
>
> I would think there were techniques developed to combat this  
> problem back when Kinney's ruled television recording... and that  
> there are ones developed for use with more modern equipment.
>
> Defocusing the image does reduce the moiré, but also reduces the  
> sharpness.
>
> I plan to play with changing the image size when I'm back in the  
> office and set up again.
>
> Any suggestions would be welcome.  I'd be happy to post results if  
> anyone's interested. (Text and/or frame grabs.)
>
> Thanks in advance...
>
> Ted
>
> Ted Langdell
> Secretary
>
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Ted Langdell
Secretary

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