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Scale to video range on output?
Quick question about outputting an HDCAM master from FCP…
We usually perform all mastering with our smoke or flame. Those systems will scale the 8bit 0-255 data on disk to the proper 64-235 on output to tape (and during normal video monitoring).
We’ve got a simple online that currently lives in our FCP system. Our autodesk systems are tied up and we’d like to make the master right from FCP. The video is full range data that needs to be scaled to proper video levels on output. Will FCP do this automatically, or will I need to set something somewhere? We’re using a Decklink Extreme 3D+.
Thanks so much in advance.
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6 Replies
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You can apply a Broadcast Safe Filter on your sequence…
Chris Tompkins
Video Atlanta LLC -
[Adam Berk] “We usually perform all mastering with our smoke or flame. Those systems will scale the 8bit 0-255 data on disk to the proper 64-235 on output to tape (and during normal video monitoring).”
You are talking about 8b RGB, don’t you?FC lets you chose the mapping on importing RGB stuff.
By default maps to 16-239, but there is a so called “SuperWhites” option (sequence setting) that should maptot 0-255. Although I’m not sure if maps at 0-255 or 16-255.
I think Apple some times allows him self some, no much standard procedures.
rafael -
Sorry, meant 16 not 64. Mind was elsewhere…
R. Adam Berk
Managing Director
Creative Technology San Francisco
http://www.CT-SF.com -
The material is actually YUV Quicktime (Prores HQ), not RGB.
R. Adam Berk
Managing Director
Creative Technology San Francisco
http://www.CT-SF.com -
[Adam Berk] “The material is actually YUV Quicktime (Prores HQ), not RGB.”
Then, there is nothing to map.
The mapping issue is when you convert RGB to YUV.
The 0-255 RGB levels can be mapped to 16-239 YUV (Video range) or 0-255 YUV (Full range).
What you may need is to adjust levels on your Prores stuff.
rafael -
I actually answered my own question with our scope. It appears that FCP (or maybe quicktime underneath?) does in fact scale 0-255 YUV data on output, but does a terrible job at it. Running a QC report out of our Resolve system with the same material in scaled output mode passes QC flawlessly. FCP’s output does not, yet when loading pre-scaled material into FCP, it is apparent on our scope and visually on a monitor that FCP is doing an additional scale on output. In most other finishing systems, one has the ability to switch between scaled output and full range output. Does a setting of this sort exist anywhere in FCP? If not, seems like the last resort would be to apply some sort of clipping filter to get rid of the extra illegal luminance value’s on FCP’s “mostly” scaled output. Would be sort of a band-aid method but may do the trick.
R. Adam Berk
Managing Director
Creative Technology San Francisco
http://www.CT-SF.com
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