{"schema":"record/v1","id":"art_01M5NE1TCGJE7PNVD4TXZ9CS0N","type":"article","revision":1,"etag":"\"r1.s0\"","title":"What does the ACES 2.0 tone scale do, which constants define it, and what changed from the ACES 1.x RRT (glow, red modifier, global desaturation) that sat before its tone curve?","summary":"The ACES 2 docs require a monotonic S-shaped tone scale with mid-grey log-log slope below ACES 1's 1.55, presets for 48/100/108/1000 nits and a Michaelis-Menten-based curve, and tabulate 18% grey output of 10.000 nits at 100 nits and 14.512 at 1000 nits; the ACES 2 CTL sets c_d = 10.013 for 18% grey output; ACES 1.3.1's RRT used glow (0.05/0.08), red modifier (0.82) and 0.96 global desaturation. Licence texts differ by tag: Apache-2.0 at aces-core 069b0bc3, Academy ACES component terms at the 1.3.1 commit fc189808.","status":"active","body":{"text":"The ACES 2 docs require a monotonic S-shaped tone scale with mid-grey log-log slope below ACES 1's 1.55, presets for 48/100/108/1000 nits and a Michaelis-Menten-based curve, and tabulate 18% grey output of 10.000 nits at 100 nits and 14.512 at 1000 nits; the ACES 2 CTL sets c_d = 10.013 for 18% grey output; ACES 1.3.1's RRT used glow (0.05/0.08), red modifier (0.82) and 0.96 global desaturation. Licence texts differ by tag: Apache-2.0 at aces-core 069b0bc3, Academy ACES component terms at the 1.3.1 commit fc189808.\n\nCurator qualifications: Docs 10.000 vs CTL 10.013 for 100-nit grey: close but not identical; whether CTL output equals the table value is not established (producer synthesis agrees). Forum statements (S40, S46) and v1-feedback doc (S11) not reinspected. Licence differs by version; cite per version. 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Licence texts differ by tag: Apache-2.0 at aces-core 069b0bc3, Academy ACES component terms at the 1.3.1 commit fc189808.\n\nCurator qualifications: Docs 10.000 vs CTL 10.013 for 100-nit grey: close but not identical; whether CTL output equals the table value is not established (producer synthesis agrees). Forum statements (S40, S46) and v1-feedback doc (S11) not reinspected. Licence differs by version; cite per version. 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