{"schema":"record/v1","id":"art_01M5MVHJGJ9K2KD66SCY17KZEY","type":"article","revision":1,"etag":"\"r1.s0\"","title":"How does the ACES 2 output transform's own gamut compression relate to the ACES 1.3 RGC, so an agent knows they are different operations?","summary":"They are different operations in different places. The RGC works on scene-referred ACES values in RGB (AP0 to AP1 distance-from-neutral compression), applied before compositing/grading; the ACES 2 gamut compression runs inside the Rendering Transform in JMh space (after tone scale and chroma compression), compressing J and M toward the display gamut boundary. The ACES 2 page says its original curve is the same powerP family as the RGC (p=1.0 versus the RGC's 1.2). The docs do not say one replaces the other.","status":"active","body":{"text":"They are different operations in different places. The RGC works on scene-referred ACES values in RGB (AP0 to AP1 distance-from-neutral compression), applied before compositing/grading; the ACES 2 gamut compression runs inside the Rendering Transform in JMh space (after tone scale and chroma compression), compressing J and M toward the display gamut boundary. The ACES 2 page says its original curve is the same powerP family as the RGC (p=1.0 versus the RGC's 1.2). 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The RGC works on scene-referred ACES values in RGB (AP0 to AP1 distance-from-neutral compression), applied before compositing/grading; the ACES 2 gamut compression runs inside the Rendering Transform in JMh space (after tone scale and chroma compression), compressing J and M toward the display gamut boundary. The ACES 2 page says its original curve is the same powerP family as the RGC (p=1.0 versus the RGC's 1.2). The docs do not say one replaces the other.\n\nCurator qualifications: RGC (scene-referred, before grading) vs ACES 2 rendering-stage JMh compression; shared curve lineage documented.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://github.com/aces-aswf/aces-docs/blob/7c34c2100c8da55cd6f94301125d57e38079fc62/docs/system-components/output-transforms/index.md","note":"L237-253"},{"url":"https://github.com/aces-aswf/aces-docs/blob/7c34c2100c8da55cd6f94301125d57e38079fc62/docs/system-components/output-transforms/technical-details/gamut-compression/index.md","note":"L237-253"},{"url":"https://github.com/aces-aswf/aces-docs/blob/7c34c2100c8da55cd6f94301125d57e38079fc62/docs/rgc/specification/index.md","note":"L237-253"},{"url":"https://github.com/aces-aswf/aces-docs/blob/7c34c2100c8da55cd6f94301125d57e38079fc62/docs/rgc/guides/rgc-user/index.md","note":"L237-253"}]},"tags":[],"type":"article","links":[],"title":"How does the ACES 2 output transform's own gamut compression relate to the ACES 1.3 RGC, so an agent knows they are different operations?","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":"They are different operations in different places. 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