Open Display Transform implements a chromaticity preserving display transform to prepare and render a scene-linear image on a display device.

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Issues 9

Open Display Transform

An open source, chromaticity preserving, simple neutral and robust display transform for preparing wide gamut scene-linear high dynamic range images for being presented on a display device.

Currently available as a Nuke node. Resolve DCTL is planned once the design is in a less experimental stage.

ALPHA SOFTWARE - be warned that this software is highly experimental, and is being actively tested and developed. It is highly recommended that you do not use it for production use in the creation of images.

Design Goals

Simple - Simplicity of design
Robust - Can handle a variety of extremes without breaking
Neutral - No strong look, no creative intent, faithful to input imagery
Chromaticity Preserving - Faithfully represent the chromaticity values of the input image
Information Preserving - Preserve as much data as possible from the input image
Invertible - Can operate in the forward and inverse directions within limitations
Separate the Look - Intended to be used in conjunction with a look transform upstream in the processing chain

What does a display transform do?

Convert scene-referred to display-referred
- Compress high dynamic range to low dynamic range
- Compress wide gamut to smaller display gamut
Apply chromaticity conversion and inverse EOTF to prepare image for display device

Documentation

0 Open More issues

Closed

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.

opened Jul 24, 2021 by ConnecTEDDD 4

Closed

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:

opened Oct 6, 2021 by antonmeleshkevich 3

Closed

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!

opened Nov 10, 2022 by BatmanAK 2

Closed

AP0 Gamut with OpenDRT

When primaries set to AP0, OpenDRT gamut compress does this strange black thing with blue colors.

opened Nov 3, 2021 by antonmeleshkevich 2

Closed

Fix doc image links

null

opened Oct 7, 2021 by PaulGrandperrin 2

Closed

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.

opened Nov 3, 2021 by antonmeleshkevich 1

Open

OpenDRT OCIO Config

Creating a thread to track creation of a minimal but pragmatic OCIO Config using OpenDRT.

opened Jan 2, 2022 by jedypod 3

Open

ZoneSaturation turns negative values into solid black

Hi! I've noticed ZoneSaturation (even in its default state) turns pixels into solid black if at least one of a pixel channels have a negative value.

opened Dec 22, 2021 by antonmeleshkevich 0

Open

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.

opened Nov 21, 2021 by antonmeleshkevich 2

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Last update: Sep 22, 2021