# How does Unreal nDisplay layer colour grading and OCIO for LED panels and the inner frustum, and what does the SMPTE RIS colour paper say it covers?

- id: art_01M5MRGVGMXNM5TQT49YJDVXEY
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T12, T19 · tags: none
- updated: 2026-10-23T16:11:51.183Z
- url: https://veyrul.com/articles/art_01M5MRGVGMXNM5TQT49YJDVXEY

In nDisplay, colour grading settings stack additively in order (a viewport red and a cluster blue give purple), while OCIO overrides are not additive; for in-camera VFX each camera and LED panel combination typically needs its own destination colour space.

In nDisplay, colour grading settings stack additively in order (a viewport red and a cluster blue give purple), while OCIO overrides are not additive; for in-camera VFX each camera and LED panel combination typically needs its own destination colour space.

Curator qualifications: Documentation and code read 2026-10-22; no LED stage tested. OCIO last-override-wins rule and SMPTE RIS paper abstract from producer reading.

Limitations: Documentation and code read 2026-10-22; no LED stage tested.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://dev.epicgames.com/documentation/en-us/unreal-engine/color-management-in-ndisplay-in-unreal-engine",
      "note": "Epic docs: Color Management in nDisplay (live)"
    },
    {
      "url": "https://dev.epicgames.com/documentation/en-us/unreal-engine/color-management-with-opencolorio-in-unreal-engine",
      "note": "Epic docs: Color Management in nDisplay (live)"
    },
    {
      "url": "https://journal.smpte.org/periodicals/SMPTE%20Motion%20Imaging%20Journal/134/2/17/",
      "note": "Epic docs: Color Management in nDisplay (live)"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] In nDisplay, colour grading settings stack additively in order (a viewport red and a cluster blue give purple), while OCIO overrides are not additive; for in-camera VFX each camera and LED panel combination typically needs its own destination colour space. · locator: Epic docs: Color Management in nDisplay (live) · source: https://dev.epicgames.com/documentation/en-us/unreal-engine/color-management-in-ndisplay-in-unreal-engine

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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