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HD Safe Title?

Has anyone set any sort of High Definition standard for those old
familiar production considerations, Safe Title and Safe Action.  SMPTE
274M specifys a "Clean Aperture" that is slightly inside of the total
1920x1080 Production Aperture to account for D to A and blanking
tolerances, but no Safe T&A.

Existing and anticipated display technology makes these concepts
somewhat antiquated, with overscan largely a thing of the past.  On the
other hand, the anticipated downconversions for standard def broadcast
bring the issue right back again.

Thanks to Seamus O'Kane for support in 1999
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