Active picture was 486 lines until the digital universe. At that point you need numbers that can be quantized into 8x8 blocks. That's where 480 comes in which is what you find in DV video, DVDs, etc.
Avid got around this by going higher than 486, which is why you were able to capture and keep info from the vertical blanking area on the Meridien systems.
So you are suggesting that DV, DVDs, etc. were not SD video due to the lack of six lines of video that no end viewer ever saw. (And if they saw line 21 the closed captioning would have driven them nuts)
The ATSC and SMPTE would differ with your conclusion.
--- In Avid-L2@yahoogroups.com, Mark Spano <cutandcover@...> wrote:
>
> Yes - John's right there. Remember 525i? There are 525 lines of resolution,
> but the active picture raster only occupies 486 of those lines.
>
>
>
> On Thu, Jan 26, 2012 at 12:38 AM, johnrobmoore <bigfish@...> wrote:
>
> > **
> >
> >
> > Not true. The 720x486 is the active picture area and does not include
> > vertical and horizontal blanking.
> >
> >
> > --- In Avid-L2@yahoogroups.com, "Tom McDonnell" <ltr54@> wrote:
> > >
> > > >But possibly the fear of down conversion softness is
> > > why they shot SD for an SD spot.
> > >
> > > So shoot 16x9 to future proof, protect for 4x3 and extract a 4x3
> > center-cut.
> > > Still better looking than shooting 640x480. After shooting so much HD,
> > > framing 4x3 feels so claustrophobic. Now shooting 6x6 with a Hasselblad
> > is a
> > > totally different matter...
> > >
> > > The reason NTSC on a computer is 640x480 is because computers use square
> > > pixels. The smaller raster is really the true imaging area for NTSC once
> > you
> > > take away the electronic blanking and sync pulses that use up part of the
> > > 720x486 raster.
> > >
> > > Tom McDonnell
> > > Cinematographer/Editor
> > > Weisscam Hi-Speed Tech
> > > Los Angeles, CA
> > > New Orleans, LA
> > > 818-675-1501
> > >
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
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