Pull through only the colour values of a LUT

Get answers to your questions about color grading, editing and finishing with DaVinci Resolve.
  • Author
  • Message
Offline

InterrobangMP

  • Posts: 154
  • Joined: Sun Jul 15, 2018 1:50 am
  • Real Name: Paul Rayner

Pull through only the colour values of a LUT

PostSat Aug 01, 2020 2:33 am

If I wanted to pull through only the colour values of a LUT a not the gamma curve, so that I can apply my own curve, how would I go about doing that?
Hackintosh iMac 19.2
Core i9 9900k - Gigabyte Z390 Aorus Pro WiFi
16x2 Gb 2666 mHz
Sapphine Radeon Pulse RX 580
OSX 10.14.5 - Resolve 15.3.1.003
Offline
User avatar

Cary Knoop

  • Posts: 1276
  • Joined: Sun Mar 12, 2017 6:35 pm
  • Location: Newark, CA USA

Re: Pull through only the colour values of a LUT

PostSat Aug 01, 2020 5:44 am

InterrobangMP wrote:If I wanted to pull through only the colour values of a LUT a not the gamma curve, so that I can apply my own curve, how would I go about doing that?

The problem is that unlike L*a*b or YCbCr the RGB color format does not separate color from luminance.

You could try to set up a layer node with the LUT applied to the top node and setting a composite mode to color. But your mileage may vary.

The bottom line is that RGB does not separate color from luminance.
Offline

Jim Simon

  • Posts: 8483
  • Joined: Fri Dec 23, 2016 1:47 am
  • Warnings: 1

Re: Pull through only the colour values of a LUT

PostSat Aug 01, 2020 2:30 pm

I think you would need to design your own LUT.
Offline
User avatar

waltervolpatto

  • Posts: 7960
  • Joined: Thu Feb 07, 2013 5:07 pm
  • Location: 1146 North Las Palmas Ave. Hollywood, California 90038 USA

Re: Pull through only the colour values of a LUT

PostSat Aug 01, 2020 9:09 pm

InterrobangMP wrote:If I wanted to pull through only the colour values of a LUT a not the gamma curve, so that I can apply my own curve, how would I go about doing that?


You cannot.
SuperServer 5039AD-I
C9X299-PGF - DDR4-2400 16x4 GB
i9-7920xCPU 12c 2.90GHz Water cooled
2x 1080ti DeckLink Studio 4K (11.5.1)
W10-1903 - BMR St. 16.2.2.012
nvidia: 441.66 studio
Offline

Black Winter

  • Posts: 8
  • Joined: Mon May 20, 2019 4:48 am
  • Real Name: Alissa Alexina

Re: Pull through only the colour values of a LUT

PostSun Aug 02, 2020 2:02 pm

Theo of Miesner Media does exactly this, via a powergrade with HSL transforms:



I tested it in ACES, works as described.

Return to DaVinci Resolve

Who is online

Users browsing this forum: Alex Delfont, Bing [Bot], Glen Harrison, Google Feedfetcher, Howard Roll, TheBloke, Walter Sonius and 99 guests