{"schema":"record/v1","id":"art_01M5NNF9X88DT2BEAQ1N775FEA","type":"article","revision":1,"etag":"\"r1.s0\"","title":"How invertible is ACES 2.0 in practice, what exactly do the working group and docs claim, and what discrepancies between the reference CTL and a vendor integration have been reported?","summary":"Partially verified: the curator re-read S13, S34, S35, S8; S11, S16, S22, S36 were not re-read by the curator and rest on the producer's pinned reading. Working-group members say ACES 1.x was not fully invertible and that the ACES 2 inverse is meant to reproduce output images (e.g. graphics) on a forward pass, not to recover scene colorimetry; the docs say gamut compression is analytically invertible only below a threshold, above which the inverse solves approximately, as implemented in gamut_compress_inv.","status":"active","body":{"text":"Partially verified: the curator re-read S13, S34, S35, S8; S11, S16, S22, S36 were not re-read by the curator and rest on the producer's pinned reading.\n\nWorking-group members say ACES 1.x was not fully invertible and that the ACES 2 inverse is meant to reproduce output images (e.g. graphics) on a forward pass, not to recover scene colorimetry; the docs say gamut compression is analytically invertible only below a threshold, above which the inverse solves approximately, as implemented in gamut_compress_inv.\n\nCurator qualifications: Partially verified: the curator re-read S13, S34, S35, S8; S11, S16, S22, S36 were not re-read by the curator and rest on the producer's pinned reading. Curator GET 2026-10-23 of the sources not re-read (mechanical source evidence, not semantic verification): S11: HTTP 200, bytes equal to the producer pin; S16: HTTP 200, bytes equal to the producer pin; S22: HTTP 200, bytes differ from the producer pin; S36: HTTP 200, bytes differ from the producer pin. Docs, CTL and threads read 2026-10-22; no transform run. OCIO 2.4.2 NaN fix, Resolve black-cracking thread 5992 and ACES 1.3.1 sweetener code not re-read.\n\nLimitations: Docs, CTL and threads read 2026-10-22; no transform run.\n\nEvidence status: curator/producer inference or synthesis from the cited sources (code read, not executed, where code is cited); correlated desk review (Claude); not independently reviewed.","citations":[{"url":"https://raw.githubusercontent.com/aces-aswf/aces-docs/7c34c2100c8da55cd6f94301125d57e38079fc62/docs/background/v1-feedback.md","note":"aces-docs gamut-compression/index.md (raw), L154-166; ACEScentral thread 5502 (Discourse JSON), post 2 by Annie, 2024-07-09; ACEScentral thread 5771 (Discourse JSON), post 3 by sdyer, 2025-04-24; aces-core Lib.Academy.OutputTransform.ctl L890, L1690-1695"},{"url":"https://raw.githubusercontent.com/aces-aswf/aces-core/069b0bc3e1f6c62820f19fdae2fecec3f4fc0f80/lib/Lib.Academy.OutputTransform.ctl","note":"aces-docs gamut-compression/index.md (raw), L154-166; ACEScentral thread 5502 (Discourse JSON), post 2 by Annie, 2024-07-09; 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S11, S16, S22, S36 were not re-read by the curator and rest on the producer's pinned reading.\n\nWorking-group members say ACES 1.x was not fully invertible and that the ACES 2 inverse is meant to reproduce output images (e.g. graphics) on a forward pass, not to recover scene colorimetry; the docs say gamut compression is analytically invertible only below a threshold, above which the inverse solves approximately, as implemented in gamut_compress_inv.\n\nCurator qualifications: Partially verified: the curator re-read S13, S34, S35, S8; S11, S16, S22, S36 were not re-read by the curator and rest on the producer's pinned reading. 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