# When did the ACES docs first state that the lower-hull gamma is a constant 1.14, and has the docs repository changed that statement since aces-core commit cd5017c (2024-08-30)?

- id: art_01M5MS696YWS7B5B49JG7NFME6
- 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 · tags: none
- updated: 2026-10-23T16:23:33.275Z
- url: https://veyrul.com/articles/art_01M5MS696YWS7B5B49JG7NFME6

The ACES 2.0 docs page says the lower gamut hull uses a constant gamma of 1.14. That sentence was added on 2025-03-05 and is unchanged at docs main 7c34c21 (page last touched 2025-09-11). The aces-core reference CTL has used 1.14 + 0.07*log_peak since commit cd5017c (2024-08-30), so the docs sentence postdates and contradicts the code. Implementers should follow the code, and cite both when explaining the ACES 2.0 gamut mapper.

The ACES 2.0 docs page says the lower gamut hull uses a constant gamma of 1.14. That sentence was added on 2025-03-05 and is unchanged at docs main 7c34c21 (page last touched 2025-09-11). The aces-core reference CTL has used 1.14 + 0.07*log_peak since commit cd5017c (2024-08-30), so the docs sentence postdates and contradicts the code. Implementers should follow the code, and cite both when explaining the ACES 2.0 gamut mapper.

Curator qualifications: Docs and code read 2026-10-22; no transform run; log_peak definition (another library file) not read.

Limitations: Docs and code read 2026-10-22; no transform run; log_peak definition (another library file) not read.

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

```json
{
  "citations": [
    {
      "url": "https://raw.githubusercontent.com/aces-aswf/aces-docs/15bdc45c603c93c4003b3a8e5bc69cbd7a71615e/docs/output-transforms/technical-details/gamut-compression/index.md",
      "note": "aces-docs gamut-compression/index.md at 908bc7a (2025-03-05); aces-docs gamut-compression/index.md at main 7c34c21 L214; GET api.github.com/repos/aces-aswf/aces-core/commits/cd5017c (2024-08-30)"
    },
    {
      "url": "https://raw.githubusercontent.com/aces-aswf/aces-docs/908bc7a071c5fb4da711da0082f6f7ea0a6b155b/docs/output-transforms/technical-details/gamut-compression/index.md",
      "note": "aces-docs gamut-compression/index.md at 908bc7a (2025-03-05); aces-docs gamut-compression/index.md at main 7c34c21 L214; GET api.github.com/repos/aces-aswf/aces-core/commits/cd5017c (2024-08-30)"
    },
    {
      "url": "https://api.github.com/repos/aces-aswf/aces-docs/commits/908bc7a071c5fb4da711da0082f6f7ea0a6b155b",
      "note": "aces-docs gamut-compression/index.md at 908bc7a (2025-03-05); aces-docs gamut-compression/index.md at main 7c34c21 L214; GET api.github.com/repos/aces-aswf/aces-core/commits/cd5017c (2024-08-30)"
    },
    {
      "url": "https://raw.githubusercontent.com/aces-aswf/aces-docs/4427929f46103ef116a2dd7b59096093da331bbc/docs/system-components/output-transforms/technical-details/gamut-compression/index.md",
      "note": "aces-docs gamut-compression/index.md at 908bc7a (2025-03-05); aces-docs gamut-compression/index.md at main 7c34c21 L214; GET api.github.com/repos/aces-aswf/aces-core/commits/cd5017c (2024-08-30)"
    },
    {
      "url": "https://raw.githubusercontent.com/aces-aswf/aces-docs/7c34c2100c8da55cd6f94301125d57e38079fc62/docs/system-components/output-transforms/technical-details/gamut-compression/index.md",
      "note": "aces-docs gamut-compression/index.md at 908bc7a (2025-03-05); aces-docs gamut-compression/index.md at main 7c34c21 L214; GET api.github.com/repos/aces-aswf/aces-core/commits/cd5017c (2024-08-30)"
    },
    {
      "url": "https://api.github.com/repos/aces-aswf/aces-docs/commits?path=docs/system-components/output-transforms/technical-details/gamut-compression/index.md",
      "note": "aces-docs gamut-compression/index.md at 908bc7a (2025-03-05); aces-docs gamut-compression/index.md at main 7c34c21 L214; GET api.github.com/repos/aces-aswf/aces-core/commits/cd5017c (2024-08-30)"
    },
    {
      "url": "https://github.com/aces-aswf/aces-core/commit/cd5017c58834d5b5b407a6d0954ee60271968971",
      "note": "aces-docs gamut-compression/index.md at 908bc7a (2025-03-05); aces-docs gamut-compression/index.md at main 7c34c21 L214; GET api.github.com/repos/aces-aswf/aces-core/commits/cd5017c (2024-08-30)"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] The ACES 2.0 docs page says the lower gamut hull uses a constant gamma of 1.14. That sentence was added on 2025-03-05 and is unchanged at docs main 7c34c21 (page last touched 2025-09-11). The aces-core reference CTL has used 1.14 + 0.07*log_peak since commit cd5017c (2024-08-30), so the docs sentence postdates and contradicts the code. Implementers should follow the code, and cite both when explaining the ACES 2.0 gamut mapper. · locator: aces-docs gamut-compression/index.md at 908bc7a (2025-03-05); aces-docs gamut-compression/index.md at main 7c34c21 L214; GET api.github.com/repos/aces-aswf/aces-core/commits/cd5017c (2024-08-30) · source: https://raw.githubusercontent.com/aces-aswf/aces-docs/15bdc45c603c93c4003b3a8e5bc69cbd7a71615e/docs/output-transforms/technical-details/gamut-compression/index.md

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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