Film Emulation LUT to ACEScc LMT

Michael Easter Nov 17, 2016

  1. Can someone guide me in using a commercial film emulation LUT as a Look Management Transform?

    The DP i'm working with would like to use a commercial film emulation LUT on-set and for dailies, with a view to use it as the starting point for the final grade.

    At various stages in the production, we'll be shooting on the Arri AMIRA, Arri AlexaXT, RED Epic, GoPro and some other unspecified drone camera. There are around 5 VFX shots as well.

    I'll be delivering to Rec.709 BT.1886 and DCI-P3, grading in DaVinci Resolve 12.5.x

    The colour pipeline at the moment stands at:

    ACEScc v1.02

    1. IDT: Alexa Log-C EI800 v3 (or the ITD for which-ever camera is used)
    2. LMT [CDL: offset and saturation only]
    3. RRT + ODT: Rec.709 100nits BT.1886
    4. Emulation LUT [Rec. 709 Kodak Vis3 50D 5203 NEG_FC (input Rec.709 --> LUT --> Film Contrast)]
    I imagine I want the LMT to be a combination of the CDL and the Emulation LUT

    1. IDT: Alexa Log-C EI800 v3 (or the ITD for which-ever camera is used)
    2. LMT [CDL: offset and saturation only] + Emulation LUT
    3. RRT + ODT: Rec.709 100nits BT.1886
    The LUT comes with a number of different transfer function - eg. Rec.709, generic LOG, Alexa LogC, REDLogFilm etc.

    I have access to Lattice, DaVinci Resolve, Pomfort LiveGrade to transform and concatenate LUTS and LMTs.

    Can someone point me in the right direction?

    Thanks!
     
  2. Jack Jones Colourist

    Jack Jones Colourist Original Member

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    I realise that this is absolutely of no help to you, but this whole film emulation in ACES thing is coming up a whole lot.

    I think if DPs were made more aware of the role of the RRT and also the various companies behind it (Fuji especially) then they would be aware that they are trying to do film emulation inside film emulation. I also question it's merits within a HDR delivery world.

    I think more education about the ACES pipeline is a must. It's all about image rendering. The ACES RRT is a cinematic rendering of the scene - the original RRTs more so, however because they couldn't inverse they weren't all that practical.

    That said, you have all the tools - except for maybe LightSpace and LUTcalc (other software also exists) so you should be pretty set to do what you want.
     
    Adam Hawkey and Marc Wielage like this.

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