• DaVinci Resolve

  Data to Video LUT questions

  Posted by Robert Houllahan on February 22, 2011 at 4:41 am

  I am grading a picture which is 2K DPX frames from an Arriscan and we are doing a 709 pass first. I have the SDI out going to a Panny 11UK Plasma with SDI In. It is Single link so I set the display out from the Decklink to 1080P 24 4:2:2 10 bit.

  I see that there are 2 display LUT’s that came with Resolve, Data2VideoClip and Data2VideoScale should I be using one of these for the grade? Are they LOG to 709 (clipped and scaled) ??

  Is there any more info on the built in LUT’s that came with Resolve? Not much is said in the Manual about this…

  -Rob-

  Robert Houllahan
  Director / Colorist
  Cinelab Inc.
  http://www.cinelab.com

  MAHC-PRO 3X GTX285 20Tb SAS…

  Robin Erard replied 15 years, 2 months ago 5 Members · 7 Replies
• 7 Replies

• 

  Kevin Cannon

  February 22, 2011 at 6:12 am

  I believe those LUTs are supposed to be used when you will output DPX (or other) and need to have legally scaled values in those flies. Without using them, Resolve will always render DPX in the 0-1023 range that it works with internally…

  You don’t need to apply those for grading, because if you monitor needs or is set for legally scaled video (likely can be set for either), you can enable “legally scaled values” in the monitoring config right above the “1080p 24 4:2:2” selection. That will scale the values on the SDI and HDMI outputs, but any DPX (or other) renders will still be unscaled. In the deck config you can do the same if you need to scale the values coming in and out of the deck…

  You could have your monitors set to expect scaled, Resolve sending scaled to the monitors, and output DPX files in 0-1023 without those LUTs, if that is an acceptable delivery.

  KC

  prehistoricdigital.com
  hardworkingpixels.com
• 

  Andi Winter

  February 22, 2011 at 10:08 am

  hi all!

  kevin is right. if you are unsure about how you have to deliver your final dpx output ask your lab.

  and if you need log2lin conversion go with the 3dluts provided by arri on their website! worked for me during a small test with alexa and d21 material with logc basis.

  the exact difference between the two luts you’ve mentioned would be interesting though. their names would suggest that one just cuts at the given boundaries and the other one scales the image down to fit in those boundaries. but when i tried it, i really couldnt see any difference on the scopes. only if i make a manual lut on the basis of one of the mentioned luts it seems to scale…

  so far i ended up with not using them and staying in normal range mode, for the projects i have been working on so far all rendered out in pro res 422 hq and therefore is scaled automatically…

  andy
• 

  Gabriele Turchi

  February 22, 2011 at 2:52 pm

  hi assume that robert need log to lin lut …
  does resolve have it ?(never worked in LOG in resolve so far..)

  g
• 

  Robert Houllahan

  February 22, 2011 at 8:10 pm

  I figured that if I was viewing REC709 on a calibrated monitor that I didn’t have a problem,but I wanted to make sure. As for DPX file output I am the lab (https://www.cinelab.com) and that is a totally different ball of wax…. I am leaning towards Light-Space with the tools to calibrate DI all the way to 35mm print…. but which projector???

  -Rob-

  Robert Houllahan
  Director / Colorist
  Cinelab Inc.
  http://www.cinelab.com

  MAHC-PRO 3X GTX285 20Tb SAS…
• 

  Robin Erard

  March 2, 2011 at 12:45 pm

  hello,

  This is exactly what I did. But what do I should tell to the lab for a 35mm print.

  I graded a feature in “scale mode” from Canon 5D, it goes on my projector in “legally scaled values”. I don’t use any LUT (I just know that I’m in REC709).

  Now (and I didn’t know that before) we need a 35mm print for this film, then I output in DPX 10bit. What do I should tell to the lab to be sure they will interpret correctly the footage ?

  I was thinking to say that : DXP 10bit, REC709, 0-1023. Do you think it’s correct ?

  All the best

  Robin
  sorry for my english, I speak french…

  réalisateur, scénariste, monteur
  http://www.robinerard.ch
• 

  Kevin Cannon

  March 2, 2011 at 6:13 pm

  That sounds right, but ask the lab what information they need and if they need particular specs. If you say “DPX 10-bit RGB Rec 709, 0-1023” and perhaps the gamma (again, ask them) they should know what to do and have the necessary LUTs to do it…but definitely ask.

  KC

  prehistoricdigital.com
  hardworkingpixels.com
• 

  Robin Erard

  March 3, 2011 at 7:41 am

  Hello,

  Thank’s for your answer. I gonna ask them. About the gamma information, I thaught that was implicit when it’s in REC709, but I think I’m wrong… then where can I found this information ? (You mean the gamma of the computer 1.8 or 2.2 ?)

  All the best

  Robin

  réalisateur, scénariste, monteur
  http://www.robinerard.ch

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