{"schema":"record/v1","id":"art_01M5NP1BWWPQB9S7SJZ7BZ27BV","type":"article","revision":1,"etag":"\"r1.s0\"","title":"What do Dolby Vision metadata levels L0, L1, L2, L3 and L8 mean, and which of them does a colourist author versus the system generate?","summary":"Partially verified: the curator re-read none of the cited sources; S1, S2, S10, S13 rest on the producer's pinned reading. Dolby's own best-practice guide (v4.0, Dec 2019) describes a four-step process: grade the HDR master, run per-shot L1 analysis (automatic, three tonal values, not editable), optionally author trims (L2 in CMv2.9, L8 in CMv4) against named target displays, then deliver. L0 is the static global block; L3 offsets L1 in CMv4; in CMv4 files the old L2 block is computed for backward compatibility. Netflix's partner page (snapshot 2026-07-26) says L1 is required on every shot and the SDR 100-nit L2/L8 trim values are not required. FFmpeg's header and dovi_tool's README independently label which levels are per-frame dynamic and which are static.","status":"active","body":{"text":"Partially verified: the curator re-read none of the cited sources; S1, S2, S10, S13 rest on the producer's pinned reading.\n\nDolby's own best-practice guide (v4.0, Dec 2019) describes a four-step process: grade the HDR master, run per-shot L1 analysis (automatic, three tonal values, not editable), optionally author trims (L2 in CMv2.9, L8 in CMv4) against named target displays, then deliver. L0 is the static global block; L3 offsets L1 in CMv4; in CMv4 files the old L2 block is computed for backward compatibility. Netflix's partner page (snapshot 2026-07-26) says L1 is required on every shot and the SDR 100-nit L2/L8 trim values are not required. FFmpeg's header and dovi_tool's README independently label which levels are per-frame dynamic and which are static.\n\nCurator qualifications: Partially verified: the curator re-read none of the cited sources; S1, S2, S10, S13 rest on the producer's pinned reading. Curator GET 2026-10-23 of the sources not re-read (mechanical source evidence, not semantic verification): S1: HTTP 200, bytes equal to the producer pin; S2: HTTP 200, bytes differ from the producer pin; S10: HTTP 200, bytes differ from the producer pin; S13: HTTP 200, bytes differ from the producer pin.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://professional.dolby.com/siteassets/pdfs/dolby_vision_best-practices_colorgrading_v4.pdf","note":"candidate evidence excerpts"},{"url":"https://partnerhelp.netflixstudios.com/hc/en-us/articles/360058735254-Dolby-Vision-Metadata-Overview","note":"candidate evidence excerpts"},{"url":"https://github.com/FFmpeg/FFmpeg/tree/5fd305b8f4214765500f6f6c50a52cf950cb049d","note":"candidate evidence excerpts"},{"url":"https://github.com/quietvoid/dovi_tool/tree/fd0b28c420d6deceb4be4cb0257fb898504afaa0","note":"candidate evidence excerpts"}]},"categories":["T10","T12"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"metadata_checked","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://professional.dolby.com/siteassets/pdfs/dolby_vision_best-practices_colorgrading_v4.pdf","claim":"Dolby's own best-practice guide (v4.0, Dec 2019) describes a four-step process: grade the HDR master, run per-shot L1 analysis (automatic, three tonal values, not editable), optionally author trims (L2 in CMv2.9, L8 in CMv4) against named target displays, then deliver. L0 is the static global block; L3 offsets L1 in CMv4; in CMv4 files the old L2 block is computed for backward compatibility. Netflix's partner page (snapshot 2026-07-26) says L1 is required on every shot and the SDR 100-nit L2/L8 trim values are not required. 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L0 is the static global block; L3 offsets L1 in CMv4; in CMv4 files the old L2 block is computed for backward compatibility. Netflix's partner page (snapshot 2026-07-26) says L1 is required on every shot and the SDR 100-nit L2/L8 trim values are not required. FFmpeg's header and dovi_tool's README independently label which levels are per-frame dynamic and which are static.\n\nCurator qualifications: Partially verified: the curator re-read none of the cited sources; S1, S2, S10, S13 rest on the producer's pinned reading. Curator GET 2026-10-23 of the sources not re-read (mechanical source evidence, not semantic verification): S1: HTTP 200, bytes equal to the producer pin; S2: HTTP 200, bytes differ from the producer pin; S10: HTTP 200, bytes differ from the producer pin; S13: HTTP 200, bytes differ from the producer pin.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://professional.dolby.com/siteassets/pdfs/dolby_vision_best-practices_colorgrading_v4.pdf","note":"candidate evidence excerpts"},{"url":"https://partnerhelp.netflixstudios.com/hc/en-us/articles/360058735254-Dolby-Vision-Metadata-Overview","note":"candidate evidence excerpts"},{"url":"https://github.com/FFmpeg/FFmpeg/tree/5fd305b8f4214765500f6f6c50a52cf950cb049d","note":"candidate evidence excerpts"},{"url":"https://github.com/quietvoid/dovi_tool/tree/fd0b28c420d6deceb4be4cb0257fb898504afaa0","note":"candidate evidence excerpts"}]},"tags":[],"type":"article","links":[],"title":"What do Dolby Vision metadata levels L0, L1, L2, L3 and L8 mean, and which of them does a colourist author versus the system generate?","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":"Partially verified: the curator re-read none of the cited sources; S1, S2, S10, S13 rest on the producer's pinned reading. Dolby's own best-practice guide (v4.0, Dec 2019) describes a four-step process: grade the HDR master, run per-shot L1 analysis (automatic, three tonal values, not editable), optionally author trims (L2 in CMv2.9, L8 in CMv4) against named target displays, then deliver. L0 is the static global block; L3 offsets L1 in CMv4; in CMv4 files the old L2 block is computed for backward compatibility. Netflix's partner page (snapshot 2026-07-26) says L1 is required on every shot and the SDR 100-nit L2/L8 trim values are not required. FFmpeg's header and dovi_tool's README independently label which levels are per-frame dynamic and which are static.","evidence":{"claims":[{"url":"https://professional.dolby.com/siteassets/pdfs/dolby_vision_best-practices_colorgrading_v4.pdf","claim":"Dolby's own best-practice guide (v4.0, Dec 2019) describes a four-step process: grade the HDR master, run per-shot L1 analysis (automatic, three tonal values, not editable), optionally author trims (L2 in CMv2.9, L8 in CMv4) against named target displays, then deliver. L0 is the static global block; L3 offsets L1 in CMv4; in CMv4 files the old L2 block is computed for backward compatibility. Netflix's partner page (snapshot 2026-07-26) says L1 is required on every shot and the SDR 100-nit L2/L8 trim values are not required. 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