> First of all, how did the grading house generate their QT?
Not sure what application or machine they used, but the QT was delivered in
0-255.
> Did you import the
> QT into MC?
Yes.
> What color mapping did you use?
The QT, that had 0-255 levels, we imported with the RGB setting.
The resulting color bars (without pluge) were correct, when seen on a
waveform monitor. And also the levels in the program itself looked spot on
in the WFM.
> Do you mean that you are importing
> the QT into MC and then comparing the MC->FCP result to the original QT
> natively inside FCP?
The CC'd QT is imported into MC, then played out of MC (upscaled to HD),
over HD-SDI, into the FCP-BMD rig.
In FCP, the student then also imported the CC'd QT in FCP, and in FCP,
compared that import to this capture.
The student also exported a 601/709 QT from Avid, and imported that into
FCP, and compared to the other import and the capture.
The two imports match up to each other, but not to the captured clip. Which
is why he started to worry, and wondered which of the two versions was
"right". According to the WFM monitor, the captured clip was right, the two
imports were wrong. And it seemed that there was nothing we could to to stop
FCP from changing the levels upon import.
> If so, it's unlikely that this will match up
Why? One should be able to have both match up. Levels are levels, and one
should be able to maintain them. Or at least have SOME control over where
they end up.
> unless you
> are comparing both on a broadcast monitor/scope via HD-SDI.
Which is what we did. Or actually, we hooked up the BMD's HD-SDI output to
the Nitris DX input, then used the WFM in Avid.
The other issue is that the BDM's HD-SDI output correctly gave us 16-235,
whereas its HDMI output clearly stretches to 0-255 (easily seen on a
monitor), without the option of changing that. The Nitris DX lets you choose
the color space for its HDMI output. I think that's much more what any user
should expect.
> Also if the file
> is ProRes, you might also get different results compared with uncompressed,
> since ProRes has an automatic gamma correction function as part of its
> encoding parameters.
The file was uncompressed SD.
Thx.
--
Job ter Burg
film editor - NL
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