{"schema":"record/v1","id":"art_01M5MCC96QPS8791YQR6G362M3","type":"article","revision":1,"etag":"\"r1.s0\"","title":"What do the colour-tag numbers (primaries, transfer, matrix, range; e.g. 1-1-1 for Rec.709) mean, and which of them does a file really need?","summary":"A video colour tag is up to four independent facts: colour primaries, transfer characteristics, matrix coefficients (the three H.273 / ISO 23091-2 code points, which Apple writes as an nclc triple in that order, 1-1-1 for HD Rec.709) and a separate full/limited range flag. Code 2 means unspecified in each. The code values here are read from the FFmpeg header that says it matches H.273 and from Apple TN2227; the H.273 PDF itself was over the fetch cap, so the numbers are not compared to the standard text.","status":"active","body":{"text":"A video colour tag is up to four independent facts: colour primaries, transfer characteristics, matrix coefficients (the three H.273 / ISO 23091-2 code points, which Apple writes as an nclc triple in that order, 1-1-1 for HD Rec.709) and a separate full/limited range flag. Code 2 means unspecified in each. The code values here are read from the FFmpeg header that says it matches H.273 and from Apple TN2227; the H.273 PDF itself was over the fetch cap, so the numbers are not compared to the standard text.\n\nCurator qualifications: A colour tag is primaries, transfer, matrix (H.273 code points; Apple nclc order, 1-1-1 for HD Rec.709) plus a separate range flag; code 2 means unspecified.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://www.itu.int/dms_pubrec/itu-t/rec/h/T-REC-H.273-202407-I!!SUM-HTM-E.htm","note":"candidate evidence excerpts"},{"url":"https://www.itu.int/rec/T-REC-H.273-202407-I/en","note":"candidate evidence excerpts"},{"url":"https://github.com/FFmpeg/FFmpeg/blob/9047fa1b084f76b1b4d065af2d743df1b40dfb56/libavutil/pixfmt.h","note":"candidate evidence excerpts"},{"url":"https://developer.apple.com/library/archive/technotes/tn2227/_index.html","note":"candidate evidence excerpts"},{"url":"https://developer.apple.com/library/archive/technotes/tn2162/_index.html","note":"candidate evidence excerpts"},{"url":"https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.709-6-201506-I!!PDF-E.pdf","note":"candidate evidence excerpts"}]},"categories":["T06","T10","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://www.itu.int/dms_pubrec/itu-t/rec/h/T-REC-H.273-202407-I!!SUM-HTM-E.htm","claim":"A video colour tag is up to four independent facts: colour primaries, transfer characteristics, matrix coefficients (the three H.273 / ISO 23091-2 code points, which Apple writes as an nclc triple in that order, 1-1-1 for HD Rec.709) and a separate full/limited range flag. 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The code values here are read from the FFmpeg header that says it matches H.273 and from Apple TN2227; the H.273 PDF itself was over the fetch cap, so the numbers are not compared to the standard text.\n\nCurator qualifications: A colour tag is primaries, transfer, matrix (H.273 code points; Apple nclc order, 1-1-1 for HD Rec.709) plus a separate range flag; code 2 means unspecified.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://www.itu.int/dms_pubrec/itu-t/rec/h/T-REC-H.273-202407-I!!SUM-HTM-E.htm","note":"candidate evidence excerpts"},{"url":"https://www.itu.int/rec/T-REC-H.273-202407-I/en","note":"candidate evidence excerpts"},{"url":"https://github.com/FFmpeg/FFmpeg/blob/9047fa1b084f76b1b4d065af2d743df1b40dfb56/libavutil/pixfmt.h","note":"candidate evidence excerpts"},{"url":"https://developer.apple.com/library/archive/technotes/tn2227/_index.html","note":"candidate evidence excerpts"},{"url":"https://developer.apple.com/library/archive/technotes/tn2162/_index.html","note":"candidate evidence excerpts"},{"url":"https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.709-6-201506-I!!PDF-E.pdf","note":"candidate evidence excerpts"}]},"tags":[],"type":"article","links":[],"title":"What do the colour-tag numbers (primaries, transfer, matrix, range; e.g. 1-1-1 for Rec.709) mean, and which of them does a file really need?","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":"A video colour tag is up to four independent facts: colour primaries, transfer characteristics, matrix coefficients (the three H.273 / ISO 23091-2 code points, which Apple writes as an nclc triple in that order, 1-1-1 for HD Rec.709) and a separate full/limited range flag. 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