Re: [Avid-L2] File delivery QC?

What do these standards mean in a file based / digital world?

Each pixel has an R, G, and a B value which range from 0-1023 or from 65-940 (or their 8-bit equivalents), and thats about all there is to it right?

As long as the the content is is making to to the air without having a mismatch of SMPTE vs full range signals, I dont know what possible values could cause "problems" in a digital environment. Why limit chroma or luma, or anything for that matter? Were not talking about overloading an analog circuit with a high voltage potentially damaging broadcast equipment or anything like that.

Someone wiser than me please explain to me what the point of perpetuating all this is?

-N

On Aug 1, 2012, at 3:49 PM, John Moore wrote:

> I've done a lot of looking at Cerify for QC of files. So far my best approach has been to export a QT same as source from Avid and then either import that file back into older versions of symphony or on newer version link to ama with the file and play it back through my Tek wfm 7020 running the error log set to Tek default settings, which according to Tek support engineers will mimic the traditional Tek error alarms through all their legacy products. I have a show done by someone else who used safe color limit with 422 checked but did not set the RGB limits to 16 and 235. As a result the outputs to tape going through an outboard legalizer are okay but show occasional RGB errors, our legalizer isn't as good as the Harris/Video Tek which would catch these errors. We also deliver a prores file of the show for DVD authoring. Well bypassing the legalizer to get an idea of what the safe color limit will do for the file export lights up like a Xmas
> Tree as I would expect with no RGB limiting in the safe color effect. I'm told one of these shows already passed QC so that tells me they aren't too precise on their end. What will the RGB errors really do on a DVD encode? It seems nobody cares about Rec 709 spec or worries about these RGB errors. Sometimes I think I shouldn't care either but that's not right. Can anybody share any issues with bad RGB levels in the file based world?
>
> John Moore
>
> Barking Trout Productions
>
> Studio City, CA
>
> bigfish@pacbell.net
>
> [Non-text portions of this message have been removed]
>
>

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