An open collection of tools and experiments for rendering wide-gamut scene-linear data into an image for an SDR or HDR display device.

Last update: Dec 29, 2022

Comments: 7

Open Display Transform

All tools are available as a node for Nuke or Nuke Non-Commercial, and as a DCTL for Resolve Studio. Matchbox shaders are in development.

Display Transforms

OpenDRT
A simple and robust display transform based on CIE 2006 LMS and the Michaelis-Menten Equation.
Neutral appearance. Color preserving where possible, faithful to input image data.
rgbDT
A classic per-channel display-transform. Uses a custom rendering gamut designed to handle input colorimetry beyond the bounds of the spectral locus without sacrificing image appearance.
JzDT
Another experiment using the max(r,g,b) norm and the JzAzBz LMS space.

Look Transforms

A collection of tools designed to creatively adjust image appearance.

Documentation

There is a collection of documentation available on the wiki.

Owner

Jed Smith

https://github.com/jedypod/open-display-transform

Comments

Nayatani_HK.dctl with DR17/ATI/W10

Dear Jed,

Thank you in advance for your work/updates.

The first and the newer Nayatani_HK.dctl are not working in Windows 10 with Resolve 17.2.2 and ATI Radeon VII.

Propably it has a syntax in code that is not supported by ATI GPU.

Gamut Compress 0.7 had a similar issue, but you/Nick have solved it: https://github.com/jedypod/gamut-compress/issues/4

Thank you.

Ted.
DCDM Inverse ODT

Hi! Here is the example of what I was talking about. Even with rec709 limited gamut, XYZ image can't be completely used as an input for DCDM. And even if a hard clip the input image far from 0 and 1 values.

I've used Rec709 curve because if I use power law gamma or just Linear, the image that goes into Inverse ODT doesn't contain colors that cause this artifact.

And here is what happens if I replace Inverse ODT and ODT by each other:
Dolby presets not preserving red objects hue

It's most noticeable with 100 nit vs others. But with others it's also noticeable. The more nits - the more red jacket shifts to the orange. Not sure if this an issue or it behaves as it should. And I apologize for the giant images :) It's probably because they are vertical.
NotoriousSix_Vibrance - random black pixels with 'chromaticity-linear' checkbox

I get these artifacts with all default settings of the DCTL. But when I turn off "chromaticity-linear" they go away. And all the other look tools don't have this.

Looks like they are completely random. When I change anything prior the DCTL, they appear in random places. Does it look like a platform specific issue? I guess, you don't get this on your system.

And not to open a new issue for just one small thing, just add it here: Is Linear Grade pivot default correct? Looks like it is far from 0.18 now.
Negative values are white pixels now with OpenDRT

Hi! In OpenDRT v0.0.90b2 I get this, if the image has negative values.

By the way, this is the red jacket I was talking about. Its hue is different with different "dolby" presets.
N6 Value and Vibrance not working in Resolve

Hi, Jedypod,

I installed the N6 Value and N6 Vibrance dctls into Resolve and when I move the sliders they do nothing at all. Am I missing a step? Thanks for your help!
Inverse DRT issues

Hi! I get this when I try to inverse HDR DRTs. Looks like it turns high saturated colors into 0 in linear gamma.

And here is another thing, I've already asked about. But I'm not sure I understood your answer right. Is this expected and correct behavior? It is Inverse 1886 and then back to 1886. All the colors look different, even those that are low saturated.

P.S. I've added OpenDRT into built-in Resolve ACES :) They've made it possible now to add custom IDT and ODT based on DCTL.

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An open collection of tools and experiments for rendering wide-gamut scene-linear data into an image for an SDR or HDR display device.

Open Display Transform

Display Transforms

Look Transforms

Documentation

Owner

Jed Smith

Comments

Nayatani_HK.dctl with DR17/ATI/W10

DCDM Inverse ODT

Dolby presets not preserving red objects hue

NotoriousSix_Vibrance - random black pixels with 'chromaticity-linear' checkbox

Negative values are white pixels now with OpenDRT

N6 Value and Vibrance not working in Resolve

Inverse DRT issues

Related tags

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CaribouLite turns any 40-pin Raspberry-Pi into a Tx/Rx 6GHz SDR

OpenScan is an open-source document scanner app that enables users to scan hard copies of documents or notes and convert it into a PDF file. No ads. No data collection. We respect your privacy.

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