# Which title-safe and action-safe numbers do EBU, SMPTE (via secondary extracts), DPP/Channel 4, Netflix, BBC and ATSC documents give for HD and UHD, and where do they disagree?

- id: art_01M5MD2S73KFNP7EHMTDYMYDA9
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T10, T17, T20 · tags: none
- updated: 2026-10-23T12:51:55.741Z
- url: https://veyrul.com/articles/art_01M5MD2S73KFNP7EHMTDYMYDA9

Readable sources converge on a 90% title/text/graphics rectangle (5% inset per side) and a 93% action rectangle (3.5% inset): EBU R 95, SMPTE ST 2046-1 as quoted by NAB, Netflix (2026 snapshot), and the DPP/Channel 4 text-safe tables (90%) agree numerically. They differ in what they require: Netflix says it has no strict requirement and tolerates motion text leaving the box; DPP/Channel 4 make text safe mandatory and add a 4:3 text-safe box of 67.5% x 90%; ATSC maps ST 2046-1 onto IMSC1 subtitles as origin 5% 5%, extent 90% 90%. Older rules differ: BBC Technical Standards v1.3 (2002, third-party copy) gives caption safe 80% width and 90% height for 16:9 protected UK TX, and the CEA-708 caption window still uses the legacy 80% x 80% area per SMPTE. The ST 2046-1 text itself is paywalled; SMPTE reports in 2024 list an open project to add UHD safe areas.

Readable sources converge on a 90% title/text/graphics rectangle (5% inset per side) and a 93% action rectangle (3.5% inset): EBU R 95, SMPTE ST 2046-1 as quoted by NAB, Netflix (2026 snapshot), and the DPP/Channel 4 text-safe tables (90%) agree numerically. They differ in what they require: Netflix says it has no strict requirement and tolerates motion text leaving the box; DPP/Channel 4 make text safe mandatory and add a 4:3 text-safe box of 67.5% x 90%; ATSC maps ST 2046-1 onto IMSC1 subtitles as origin 5% 5%, extent 90% 90%. Older rules differ: BBC Technical Standards v1.3 (2002, third-party copy) gives caption safe 80% width and 90% height for 16:9 protected UK TX, and the CEA-708 caption window still uses the legacy 80% x 80% area per SMPTE. The ST 2046-1 text itself is paywalled; SMPTE reports in 2024 list an open project to add UHD safe areas.

Curator qualifications: Excerpts E1, E3, E4, E6, E7, E8, E11 present; E2 present in layout text ('16:9 Text safe 90% of Width 96 – 1 823'; digit grouping space). Curator arithmetic: 1920 x 5% = 96 and 1920 - 96 - 1 = 1823 (zero-based inclusive, 1,728 px = 90%); 4:3 67.5% x 1920 = 1,296 px, (1920 - 1296)/2 = 312 to 1607; UHD 192 to 3647; EBU 3.5% of 1920 = 67.2 px, and R 95's revision notes record a correction where '3.5% of 16:9 was misquoted as 76, instead of the correct, 67 pixels'. The DPP ranges are consistent with zero-based numbering (supports the candidate's ambiguity note about the 'numbered 1' header). BBC 2002 copy and BBC subtitle guidelines not re-read. Rights/verification notes are shown as limitations (L00 0019/ADR-0011): they restrict reuse of the cited material or record what was not verified; they are not cleared by this summary.

Limitations: [rights_conflict_record] Rights conflicts preserved (SMPTE extracts via NAB 'with permission' vs SMPTE notice; BBC 2002 third-party copy).

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://assets-corporate.channel4.com/_flysystem/s3/documents/2023-03/ProgrammeDeliverySpecificationFile_DPP-Channel4_v5.2.pdf",
      "note": "EBU R 95 PDF (equals pin): introduction and revision notes; DPP/Channel 4 v5.2 PDF (equals pin) -layout lines 624-665; ATSC A/343:2018 Amendment 1 (equals pin); as in C3R-0132"
    },
    {
      "url": "https://web.archive.org/web/20260713055110id_/https://partnerhelp.netflixstudios.com/hc/en-us/articles/360034536253-Titles-Graphics-Requirements-Best-Practices",
      "note": "EBU R 95 PDF (equals pin): introduction and revision notes; DPP/Channel 4 v5.2 PDF (equals pin) -layout lines 624-665; ATSC A/343:2018 Amendment 1 (equals pin); as in C3R-0132"
    },
    {
      "url": "https://web.archive.org/web/20190918032455id_/https://partnerhelp.netflixstudios.com/hc/en-us/articles/360034536253-Titles-Graphics-Requirements-Best-Practices",
      "note": "EBU R 95 PDF (equals pin): introduction and revision notes; DPP/Channel 4 v5.2 PDF (equals pin) -layout lines 624-665; ATSC A/343:2018 Amendment 1 (equals pin); as in C3R-0132"
    },
    {
      "url": "https://www.atsc.org/wp-content/uploads/2021/02/A343-2018-Amend-No-1.pdf",
      "note": "EBU R 95 PDF (equals pin): introduction and revision notes; DPP/Channel 4 v5.2 PDF (equals pin) -layout lines 624-665; ATSC A/343:2018 Amendment 1 (equals pin); as in C3R-0132"
    },
    {
      "url": "https://www.nab.org/xert/scitech/pdfs/tv031510.pdf",
      "note": "EBU R 95 PDF (equals pin): introduction and revision notes; DPP/Channel 4 v5.2 PDF (equals pin) -layout lines 624-665; ATSC A/343:2018 Amendment 1 (equals pin); as in C3R-0132"
    },
    {
      "url": "https://eastoverhill.co.uk/techref/technical_delivery_standards.pdf",
      "note": "EBU R 95 PDF (equals pin): introduction and revision notes; DPP/Channel 4 v5.2 PDF (equals pin) -layout lines 624-665; ATSC A/343:2018 Amendment 1 (equals pin); as in C3R-0132"
    },
    {
      "url": "https://www.bbc.co.uk/accessibility/forproducts/guides/subtitles",
      "note": "EBU R 95 PDF (equals pin): introduction and revision notes; DPP/Channel 4 v5.2 PDF (equals pin) -layout lines 624-665; ATSC A/343:2018 Amendment 1 (equals pin); as in C3R-0132"
    },
    {
      "url": "https://www.smpte.org/hubfs/SMPTE%20Standards%20Quarterly%20Report%20June%202024.pdf",
      "note": "EBU R 95 PDF (equals pin): introduction and revision notes; DPP/Channel 4 v5.2 PDF (equals pin) -layout lines 624-665; ATSC A/343:2018 Amendment 1 (equals pin); as in C3R-0132"
    },
    {
      "url": "https://www.bbc.co.uk/delivery/technical-requirements/",
      "note": "EBU R 95 PDF (equals pin): introduction and revision notes; DPP/Channel 4 v5.2 PDF (equals pin) -layout lines 624-665; ATSC A/343:2018 Amendment 1 (equals pin); as in C3R-0132"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Readable sources converge on a 90% title/text/graphics rectangle (5% inset per side) and a 93% action rectangle (3.5% inset): EBU R 95, SMPTE ST 2046-1 as quoted by NAB, Netflix (2026 snapshot), and the DPP/Channel 4 text-safe tables (90%) agree numerically. They differ in what they require: Netflix says it has no strict requirement and tolerates motion text leaving the box; DPP/Channel 4 make text safe mandatory and add a 4:3 text-safe box of 67.5% x 90%; ATSC maps ST 2046-1 onto IMSC1 subtitles as origin 5% 5%, extent 90% 90%. Older rules differ: BBC Technical Standards v1.3 (2002, third-party copy) gives caption safe 80% width and 90% height for 16:9 protected UK TX, and the CEA-708 caption window still uses the legacy 80% x 80% area per SMPTE. The ST 2046-1 text itself is paywalled; SMPTE reports in 2024 list an open project to add UHD safe areas. · locator: EBU R 95 PDF (equals pin): introduction and revision notes; DPP/Channel 4 v5.2 PDF (equals pin) -layout lines 624-665; ATSC A/343:2018 Amendment 1 (equals pin); as in C3R-0132 · source: https://assets-corporate.channel4.com/_flysystem/s3/documents/2023-03/ProgrammeDeliverySpecificationFile_DPP-Channel4_v5.2.pdf

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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