> 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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