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Legal values
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Well I can honestly say I’ve output every flavor of prores from Resolve (from Proxy, to LT, to HQ, to 4444) and every version of prores renders out scaled (as in 64-940, or 16-235 in 8 bit, and yes this includes ProRes4444), and the the DNXHD MXF renders for AVID I’ve done always scale as well on render. It would be GREAT, to have an option to render “FULL RANGE” (maybe this is an 8.1 option I’m hoping?), but currently you have to render DPX’s to get full range and then convert them in something like After Effects or Cineform or whatever to get a Full Range quicktime or something else if you need it. As always, someone please correct me if I’m wrong on this, but alas, I’m pretty sure I’m not.
Chris Hall
Colorist – Basher Films
Pasadena, CA -
yes 8.1 have that function , you can decide to render full or scaled
ps:chris: out of curiosity how do you check if the rendered QT is scaled or full ? because sometimes some system interpret the YUV as scaled but they actually are full….
g
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Chris: Without applying a LUT?
I dont think that is possible, you can set it to normal scale for monitoring, but when Im reading the scopes in other applications the rendered files are full range. Also when importing to Avid / AMA. -
Sorry Chris, if thats an opportunity in 8.1 you are probably covered 🙂
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Gabriele, I actually checked this by sending a 0-255 grayscale “stepped chart” with gray bars at increasing RGB levels from 0, 16, 35, etc. all the way to 255 (these were true numeric RGB levels). When outputting quicktimes or DNXHD’s the grayscale bars clipped at 16 and 235 every time, making the bars to the left or right solid black and or solid white with no differentiation left between the bars (whereas before there was an obvious difference in brightness).It was the only way I could think of to do a true “check” of the scaling.
Chris Hall
Colorist – Basher Films
Pasadena, CA -
and frist, sorry for my bad English,
I think Kevin Cannon is right , Resolve render YUV code as ProRes is full range that means file oneself is full range , but sometimes , when we view this file ,depending on different decoder(QuicktimeX and fcp Viewer),maybe will looks like washed out blacks and lowered whites on QX. -
I’ve been through this issue a 100 million times and tested everything. My issue is never with legal luma or chroma values its with RGB Gamut. As far as I can tell (looking at external parade, and diamond displays) Resolve does not do any sort of RGB Gamut limiting and even with LUTs applied we were still getting kick backs from QC.
At the end of the day I gave up. Our current workflow is HD-SDI output from Resolve/FCP through Harris DL860 > Ki Pro for recording to ProRes. This solution works nice as the Ki Pro is seen as a “deck” with FCP through RS422. Of course we’re limited to ProRes in that workflow but thats fine as most of our clients are asking for ProRes deliverable files We’re planning when the Cinedeck RXs are available to get one of those as they’re much more flexible recorders.
Robbie Carman
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Colorist and Author
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Hi again,
After some more testing we have come up with a solution that works for us.
1. Create a soft clip LUT (range 64-940)
2. Check the “LUT on waveform”-option
3. Apply the LUT on the overall track timeline (that way it will apply on all nodes)Then, its not possible to work in ranges under and over 64-940)
It will also be seen on the wave forms.We have testet these files in Avid MC through AMA and in Flame.
It works perfect!And, one more thing:
If you read the scopes in Avid (RGB-parade) you will notice that the 64-940-range is not exactly the same as 16-235. That actually makes it possible to stretch the ranges a bit more if you want and still be in broadcast safe.I just got an e-mail fra BMD who tells me that “When you render out to a YUV based format (all ProRes, all DNxHD), the render is
always at video levels, i.e. 64-940.” but thats not what I have experienced.Looking forward to hear your opinions on this.
Stig
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correction:
render is always at video levels, i.e. 64-940.” and that IS what I have experienced, but it means that the highlights and black levels are clipped so you have to make sure to use the output LUT to have control and not to get any surprises when importing the material to Avid or other finishing tools that read “normal scaled” values.
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As I understand it, with the exception of JPEG and JFIF stillframes, there is no such thing as full range YUV ie: it’s always scaled.
Perhaps Rohit or one of the other DaVinci team can confirm this.
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