# Where does ARRI say the creative look is applied relative to the output transform in ALF4 and ALF4c look files, and what constraints apply?

- id: art_01M5MV1Z080HE2T0G534H7D6H4
- 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: 2026-10-23T16:56:08.959Z
- url: https://veyrul.com/articles/art_01M5MV1Z080HE2T0G534H7D6H4

ARRI's ALF4 workflow guideline (dated 2025-09-30) states the look is applied in LogC4 (log-to-log CMT, with optional ASC CDL before it) and the output transform comes after, either ARRI's fixed DRTs (ALF4) or user-supplied SDR and HDR DRTs (ALF4c, which requires both and drops the Intensity control). ALF2 combined look and output rendering, and ARRI says ALF2 and ALF4 cannot be converted. ARRI recommends a LogC4-to-LogC4 CMT and says LogC3 looks must be recreated visually in LogC4 (S10).

ARRI's ALF4 workflow guideline (dated 2025-09-30) states the look is applied in LogC4 (log-to-log CMT, with optional ASC CDL before it) and the output transform comes after, either ARRI's fixed DRTs (ALF4) or user-supplied SDR and HDR DRTs (ALF4c, which requires both and drops the Intensity control). ALF2 combined look and output rendering, and ARRI says ALF2 and ALF4 cannot be converted. ARRI recommends a LogC4-to-LogC4 CMT and says LogC3 looks must be recreated visually in LogC4 (S10).

Curator qualifications: All excerpts located; ARRI ALF4/ALF4c look placement relative to output transform.

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

```json
{
  "citations": [
    {
      "url": "https://www.arri.com/resource/blob/361314/b94c6d575feb013ad78a01d97989cbd4/arri-how-to-create-an-arri-look-file-4-workflow-guideline-en-data.pdf",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://www.arri.com/en/learn-help/learn-help-camera-system/image-science/look-files",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://arri.com/en/learn-help/learn-help-camera-system/alexa-35-workflows/alexa-35-workflow-faq",
      "note": "candidate evidence excerpts"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] ARRI's ALF4 workflow guideline (dated 2025-09-30) states the look is applied in LogC4 (log-to-log CMT, with optional ASC CDL before it) and the output transform comes after, either ARRI's fixed DRTs (ALF4) or user-supplied SDR and HDR DRTs (ALF4c, which requires both and drops the Intensity control). ALF2 combined look and output rendering, and ARRI says ALF2 and ALF4 cannot be converted. ARRI recommends a LogC4-to-LogC4 CMT and says LogC3 looks must be recreated visually in LogC4 (S10). · locator: candidate evidence excerpts · source: https://www.arri.com/resource/blob/361314/b94c6d575feb013ad78a01d97989cbd4/arri-how-to-create-an-arri-look-file-4-workflow-guideline-en-data.pdf

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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