{"schema":"record/v1","id":"art_01M5MSYRE75ANCFM57XDNM2T1R","type":"article","revision":1,"etag":"\"r1.s0\"","title":"What SDR and HDR output transforms does an ALEXA 35 apply in camera under ARRI Color Management, and which LUT files correspond?","summary":"ARRI documents four fixed in-camera display render transforms for ALEXA 35/265 under ARRI Color Management: Rec 709 (SDR), Rec 2020 (SDR), Rec 2100 PQ (HDR), Rec 2100 HLG (HDR), each with an equivalent file in the official LogC4 LUT package. A July 2025 naming guideline adds an HLG variant with 203 nit diffuse white (BT.2408) and renames the PQ/HLG colour-space tag from Rec2100 to Rec2020 in file names, while the workflow FAQ still shows the older names. ARRI's pages do not publish tone-map or roll-off parameters for these DRTs.","status":"active","body":{"text":"ARRI documents four fixed in-camera display render transforms for ALEXA 35/265 under ARRI Color Management: Rec 709 (SDR), Rec 2020 (SDR), Rec 2100 PQ (HDR), Rec 2100 HLG (HDR), each with an equivalent file in the official LogC4 LUT package. A July 2025 naming guideline adds an HLG variant with 203 nit diffuse white (BT.2408) and renames the PQ/HLG colour-space tag from Rec2100 to Rec2020 in file names, while the workflow FAQ still shows the older names. ARRI's pages do not publish tone-map or roll-off parameters for these DRTs.\n\nCurator qualifications: Quotes and file names verified. The producer's rights_conflicts entry is a naming discrepancy, not a rights conflict. The 2025-07-10 guideline documents the change itself ('Changed Color Space Tags from Rec2100 to Rec2020'), so the FAQ's Rec2100 names are stale relative to the guideline. This is a supersession relationship, not two contradictory authorities. Reclassify the S9-vs-S12 discrepancy as a documented supersession: the 2025-07-10 LUT naming guideline renamed the PQ/HLG colour-space tags (Rec2100 to Rec2020) and added an HLG DW203 variant. The FAQ (read 2026-10-22) still shows the pre-rename names. It is not a rights conflict; remove it from rights_conflicts_for_curation. Add the HLG DW203 file name (ARRI_LogC4-to-HLG_1K_Rec2020-D65_DW203_v1_65.cube) as the BT.2408 203-nit variant.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://arri.com/en/learn-help/learn-help-camera-system/alexa-35-workflows/alexa-35-workflow-faq","note":"work/arri_a35faq.html (equals producer sha cb0e5357) ALEXA 35 workflow FAQ, DRT table; work/arri_lutnaming.pdf (equals producer sha 722a0974) version history and introduction"},{"url":"https://www.arri.com/resource/blob/294602/99cf69084be7f6638181660483d3e39d/arri-lut-naming-convention-logc4-and-logc3-guideline-en-data.pdf","note":"work/arri_a35faq.html (equals producer sha cb0e5357) ALEXA 35 workflow FAQ, DRT table; work/arri_lutnaming.pdf (equals producer sha 722a0974) version history and introduction"},{"url":"https://www.arri.com/en/learn-help/learn-help-camera-system/image-science/reveal-color-science","note":"work/arri_a35faq.html (equals producer sha cb0e5357) ALEXA 35 workflow FAQ, DRT table; work/arri_lutnaming.pdf (equals producer sha 722a0974) version history and introduction"}]},"categories":["T12"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://arri.com/en/learn-help/learn-help-camera-system/alexa-35-workflows/alexa-35-workflow-faq","claim":"ARRI documents four fixed in-camera display render transforms for ALEXA 35/265 under ARRI Color Management: Rec 709 (SDR), Rec 2020 (SDR), Rec 2100 PQ (HDR), Rec 2100 HLG (HDR), each with an equivalent file in the official LogC4 LUT package. 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A July 2025 naming guideline adds an HLG variant with 203 nit diffuse white (BT.2408) and renames the PQ/HLG colour-space tag from Rec2100 to Rec2020 in file names, while the workflow FAQ still shows the older names. ARRI's pages do not publish tone-map or roll-off parameters for these DRTs.\n\nCurator qualifications: Quotes and file names verified. The producer's rights_conflicts entry is a naming discrepancy, not a rights conflict. The 2025-07-10 guideline documents the change itself ('Changed Color Space Tags from Rec2100 to Rec2020'), so the FAQ's Rec2100 names are stale relative to the guideline. This is a supersession relationship, not two contradictory authorities. Reclassify the S9-vs-S12 discrepancy as a documented supersession: the 2025-07-10 LUT naming guideline renamed the PQ/HLG colour-space tags (Rec2100 to Rec2020) and added an HLG DW203 variant. The FAQ (read 2026-10-22) still shows the pre-rename names. It is not a rights conflict; remove it from rights_conflicts_for_curation. Add the HLG DW203 file name (ARRI_LogC4-to-HLG_1K_Rec2020-D65_DW203_v1_65.cube) as the BT.2408 203-nit variant.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://arri.com/en/learn-help/learn-help-camera-system/alexa-35-workflows/alexa-35-workflow-faq","note":"work/arri_a35faq.html (equals producer sha cb0e5357) ALEXA 35 workflow FAQ, DRT table; work/arri_lutnaming.pdf (equals producer sha 722a0974) version history and introduction"},{"url":"https://www.arri.com/resource/blob/294602/99cf69084be7f6638181660483d3e39d/arri-lut-naming-convention-logc4-and-logc3-guideline-en-data.pdf","note":"work/arri_a35faq.html (equals producer sha cb0e5357) ALEXA 35 workflow FAQ, DRT table; work/arri_lutnaming.pdf (equals producer sha 722a0974) version history and introduction"},{"url":"https://www.arri.com/en/learn-help/learn-help-camera-system/image-science/reveal-color-science","note":"work/arri_a35faq.html (equals producer sha cb0e5357) ALEXA 35 workflow FAQ, DRT table; work/arri_lutnaming.pdf (equals producer sha 722a0974) version history and introduction"}]},"tags":[],"type":"article","links":[],"title":"What SDR and HDR output transforms does an ALEXA 35 apply in camera under ARRI Color Management, and which LUT files correspond?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"ARRI documents four fixed in-camera display render transforms for ALEXA 35/265 under ARRI Color Management: Rec 709 (SDR), Rec 2020 (SDR), Rec 2100 PQ (HDR), Rec 2100 HLG (HDR), each with an equivalent file in the official LogC4 LUT package. A July 2025 naming guideline adds an HLG variant with 203 nit diffuse white (BT.2408) and renames the PQ/HLG colour-space tag from Rec2100 to Rec2020 in file names, while the workflow FAQ still shows the older names. ARRI's pages do not publish tone-map or roll-off parameters for these DRTs.","evidence":{"claims":[{"url":"https://arri.com/en/learn-help/learn-help-camera-system/alexa-35-workflows/alexa-35-workflow-faq","claim":"ARRI documents four fixed in-camera display render transforms for ALEXA 35/265 under ARRI Color Management: Rec 709 (SDR), Rec 2020 (SDR), Rec 2100 PQ (HDR), Rec 2100 HLG (HDR), each with an equivalent file in the official LogC4 LUT package. A July 2025 naming guideline adds an HLG variant with 203 nit diffuse white (BT.2408) and renames the PQ/HLG colour-space tag from Rec2100 to Rec2020 in file names, while the workflow FAQ still shows the older names. 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