Re: [Avid-L2] Re: hd black levels

Yes, what Terence said. What I was getting at is if you forget IRE
completely in HD, you live a happier life, where 0mV = 0 RGB, and 700mV =
255 RGB. It translates in the composite NTSC scope to 7.5/100 IRE, but
since that's an old measurement, I bailed on it for sanity reasons.

To the OP, to be clearer, change your scope to measure in either mV or
8-bit level, rather than IRE.


On Tue, Dec 18, 2012 at 12:20 AM, Terence Curren <tcurren@aol.com> wrote:

> **
>
>
> It is sort of simple. In SD analog, setup (black) was at 7.5 except in
> Japan where it was 0.
>
>
> When we started to go component, there was a war and the US stayed at 7.5
> even
> though it didn't need to.
>
> When we went digital component, the powers that be gave in and went with
> zero
> black. When we went to HD, we stayed with zero black.
>
> If you have a VTR that downconverts. or a smart scope, they will show you
> the
> 7.5 on the converted NTSC... unless you choose not to.
>
>
> Simple, isn't it? :-0
>
> --- In Avid-L2@yahoogroups.com, mike cardeiro wrote:
>
> I am delivering many versions of a spot in HD. Although I often work in
> HD my final deliverable is almost always SD.
>
> I created my spot in after effects with whites at 255 and blacks at 0. I
> create a DNXhd qt using rgb levels (like I always do in sd).
>
> when I import into avid as RGB and look at the levels on the scope blacks
> are showing up at 7.5 ire...should this be 0 in HD or am I okay (dont want
> to have to red render 16 versions so I am trying to get this solved before)
>
> Mike Cardeiro
> Editor/Animator/Compositor
> D4 Creative Group - Philadelphia, PA
>
> http://www.michaelcardeiro.com/resume/
> http://www.youtube.com/user/mcardeiro
>
> [Non-text portions of this message have been removed]
>
>
>


[Non-text portions of this message have been removed]



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