[Avid-L2] Re: DNxHD QuckTime FCP Import Question

Your experience suggests to me FCP expects the level in the QT to be RGB in nature. This does contradict the article that says checking RGB converts the level in the QT to 16-235. From your experience and reading the article your results should happen when you check the 709 export when the source is RGB material. My understanding is anything in Avid should be of a 709 level unless it was a random codec and imported incorrectly. Man just when I thought I had this nailed down. Perhaps the RGB for Avid export sets some metadata that makes FCP QT implementation expect RGB level based on the Metadata and Avid's import function ignores that aspect of the metadata info. This is just speculation on my part.

--- In Avid-L2@yahoogroups.com, Dennis Degan <DennyD1@...> wrote:
>
>
> On Feb 5, 2010, at 1:41 AM, johnrobmoore wrote:
>
> > It is my understanding that the Avid DNX codec is alway considered to
> be 601 not RGB. When you check the RGB for export you are telling QT
> to adjust the video levels from RGB to 601 level when making the QT so
> that when the Avid imports it the levels will always be interpreted as
> 601 and come out right. By definition the DNX codec is 601. You can
> get fouled up if your source is RGB but you check 601 option then it
> will not lower the RGB levels to 601. If you are exporting from an
> Avid timeline that would be 601 space so I don't think it would be
> correct to check RGB on export. If you are exporting captured material
> that too would be 601 level. Am I missing something here. It was just
> last week I read about this and I thought the light had finally turned
> on for me regarding why some imports in Avid codecs don't change no
> matter RGB or 601 on import. Is my light fading, please say it ain't
> so.
>
> John:
>
> I can only tell you that if you export as anything other than RGB from
> Avid, the export will contain elevated black levels. That is my own
> personal experience when doing DNxHD145 1920x1080 Avid exports. If you
> export using 709 (for HD), the QT imported into FCP will have elevated
> blacks. By setting the Avid export's color space to RGB, the video
> levels are correct in FCP. I don't know if this is different from
> doing SD exports using 601; I'm talking about Avid HD exports which
> give you the choice to use 709 or RGB. In this case, RGB works
> correctly.
>
> Dennis Degan, Editor-Consultant-Knowledge Bank
> NBC Today Show, New York
>

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