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Correct setting for “Colorspace conversion uses”
Ok,
New to Resolve after a few years on Color, and before that Final Touch (anybody remember that one?)
We’re still getting everything set up and so far so good, but it seems there are a few pitfalls lurking – chief among them seems to be the “mapping” of the SDI output video…
in the CONFIG page – the default for the “Colorspace conversion uses” seems to be “Normally scaled legal video”. By leaving it to this setting, it seems that the video on the SDI output stays within 0-100 Ire values. HOWEVER – when the external scopes show 100 ire – the internal scopes show 1023. Am I correct in assuming that this setting would be fine if you were to go out to tape (or otherwise record) the SDI out, but that a rendered file would be “out of range”…? OR, does resolve “remap” the video for the rendered file as well?
The option “Unscaled full range data” seems to be more correct – the internal scopes show the same thing as the external ones, and a recorded SDI output would be the same as a rendered file… YES/NO?
If (and I’m assuming this is the case) the latter of the two options is the correct one if you are rendering files rather than recording off the SDI output – is there a way to ensure “legal values” in both rendered file and SDI output… Is this what you use soft clipping for?
All the above is of course assuming you want to stay “legal”.
AND, on that theme – and this may be a stupid question – in SD, broadcasters 100 ire legal value isn’t/wasn’t really for each of the component channels, but rather for the combined composite output – what is really “legal” in an HD world from a broadcasters view…?
Sorry if some of the above is dumb – I’m reading the manual as fast as I can, but if anyone has the cliff notes, it’d be much appreciated.
Jack
P.S.
in the mapping issue above – is it Davinci’s origins as a tape-to-tape or Film-to-tape system rearing it’s head – I mean, this would all be fine if all you were doing was recording the SDI output?
J
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11 Replies
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All of the above is correct 🙂
I actually like the fact Resolve works (like Scratch too) internally in full and the Decklink changes the SDI output to broadcast legal.
That is very usefull for recording to tape or into and AVID or something.
However, file based productions sometimes require the digital format to be legalized even when afterwards broadcasted just into the interwebs.
Resolve provides two LUTs that sound promising, DatatoVideoSCALE and DataToVideoCLIP.
You can either load em into the track or directly into the output LUT tab and enable show LUT on scopes.
However, I think the SCALE LUT is wrong, it doesn’t scale it clips too.Maybe someone official could correct me on this, or check the LUT ?
A slice of color…
DaVinci 7.1.2 OSX 10.6.7
MacPro 5.1 2x 2,4 24GB
RAID0 8TB eSata 6TB
GTX 285 / GT 120
Extreme 3D+ WAVE -
All YUV codecs, including all flavors of Pro-Res, and DNxHD, are rendered at normal video levels.
All RGB codecs, including DPX, are rendered at full data range.
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Hello,
Then one question according to what Rohit wrote.
– I graded a film from 5DMII convert in proress422Hq. I put prores422Hq in Resolve, graded on my HD Projector (REC709) and rendered in DPX for a 35mm print.
What should I say to the lab ? Until now I said that :
DPX 10bit, REC709, 0-1023
Is it correct ?
Robin
réalisateur, scénariste, monteur, étalonneur
http://www.robinerard.ch -
So, are you saying that a video showing up as full scale 0 – 1023 on the internal scopes in fact renders to “legal” 64 – 940 when you output a file? (if going to a yuv -codec)
And – is this independent of the “colorspace conversion uses” -setting?
Jack
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mmm…
are we sure that is actually rendering out 64-940 levels ?
in past past workflows i used (SCRATCH) i always rendered full QT , but when is a YUV codec , QT player scale the image the same way that the the SDI does (if set that way) …so you have a full range file , but scaled by QT player or the SDI of the system …
every time that i have rendered a legal range signal , if i reopened on a system hat use a scaled SDI , the result was washed out (because is like scale on top of a scaled image (because the system seems that does not read teh levels of the file and scale only when is full range (but it scale regardless)
g
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Hi Robin,
Yes the DPX would be rendered as 0-1023.
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Hello,
Ok, great. I was afraid.
Then it’s just for the render. When I render in RGB (Tiff, DPX) it’s always 0-1023 and when I render in prores (YUV format) it’s always 64-940 ? Right ?
Best
Robin
réalisateur, scénariste, monteur, étalonneur
http://www.robinerard.ch -
Yes
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i just rendered a prores on Davinci and openes in Scratch,
the histogram agora that is full range (not video leve 64-960)
again is godo this way because otherwise if we importa a legal level image on sistem that scale ,it will will washed out …Also QT player scale any YUV QT.so it’s godo that Gera rendered full .
but as i Said ,is not rendered legal …g
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I too would like to know this as well. I have been grading in a rather conservative way. Keeping my level down using soft clipping etc. Though it always feels like I have one hand behind my back. Am I fighting the system? I try to keep to legal levels and use soft clipping to bring it back. Would I be able to just do what ever i like then add in some soft clipping to just roll it off even still out of range. then apply the output lut?
I always thought It was better to grade with everything nice and in range but then work with in that.Thoughts?
CJ Adams
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