How could an agent numerically check a graded frame's levels against EBU R 103 and BT.709/BT.2100 without a hardware scope?
A proposed procedure assembled from the standards: decode to the stated bit depth and range, drop pixels outside the active picture, low-pass filter with R 103's separable filters (horizontal 1,2,3,4,3,2,1 over 16; vertical 1,2,1 over 4), compute the share of R,G,B,Y samples outside nominal, preferred and total bands, and flag out-of-gamut only when more than 1% of the image exceeds the preferred band. Colour balance and hue checks follow from per-channel percentiles and Cb/Cr angles. The method is the worker's synthesis; a small stdlib script reproduces the band arithmetic on synthetic data, and no real frame, tool or scope output was run or compared.
A proposed procedure assembled from the standards: decode to the stated bit depth and range, drop pixels outside the active picture, low-pass filter with R 103's separable filters (horizontal 1,2,3,4,3,2,1 over 16; vertical 1,2,1 over 4), compute the share of R,G,B,Y samples outside nominal, preferred and total bands, and flag out-of-gamut only when more than 1% of the image exceeds the preferred band. Colour balance and hue checks follow from per-channel percentiles and Cb/Cr angles. The method is the worker's synthesis; a small stdlib script reproduces the band arithmetic on synthetic data, and no real frame, tool or scope output was run or compared.
Curator qualifications: All 5 figures present; numerical R 103 / BT.709 / BT.2100 level checks (EBU R 103 percentages previously reproduced by curator in earlier review).
Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.
Structured fields
{
"citations": [
{
"url": "https://tech.ebu.ch/docs/r/r103.pdf",
"note": "candidate evidence excerpts"
},
{
"url": "https://documents.blackmagicdesign.com/UserManuals/SmartViewSmartScopeManual.pdf",
"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"
}
]
}Evidence claims
- [sourced_fact] A proposed procedure assembled from the standards: decode to the stated bit depth and range, drop pixels outside the active picture, low-pass filter with R 103's separable filters (horizontal 1,2,3,4,3,2,1 over 16; vertical 1,2,1 over 4), compute the share of R,G,B,Y samples outside nominal, preferred and total bands, and flag out-of-gamut only when more than 1% of the image exceeds the preferred band. Colour balance and hue checks follow from per-channel percentiles and Cb/Cr angles. The method is the worker's synthesis; a small stdlib script reproduces the band arithmetic on synthetic data, and no real frame, tool or scope output was run or compared. · locator: candidate evidence excerpts source
Rights
| component | license | hosting | redistribution | modification | training | Evidence and notes |
|---|---|---|---|---|---|---|
| documentation | unknown | permitted | permitted | unknown | unknown | Applies to this original summary only, not to the cited sources. |