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

[David Keleshian]

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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