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  "docId": "10.5594-JMI.2018.2798518",
  "document": {
    "abbrevTitle": "SMPTE Mot. Imag. J",
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      "source": "parsed",
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      "version": "smpte-idams-publication@v1"
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    "abstract": "Ultrahigh-definition television and high dynamic range (HDR) have been a focus of research for the past few years. However, only now is work starting on the provision of access services for such content. These services are used by a large minority of the audience (up to 25%) and legislation mandates their inclusion in many territories. The authors present work undertaken to verify the transform for use with hybrid log-gamma HDR video in Appendix P of the World Wide Web Consortium Timed Text Markup Language (W3C TTML) version 2 working draft specification, which is likely to be used for subtitling in traditional and Internet Protocol (IP) based video services. Further, they present test results investigating whether there is a perceived brightness variability for subtitles using the TTML conversions when displayed over different HDR video content. The authors present work undertaken to verify the transform for use with hybrid log-gamma HDR video in Appendix P of the World Wide Web Consortium Timed Text Markup Language (TTML) version 2 working draft specification.",
    "abstract$meta": {
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      "source": "parsed",
      "updated": "2026-10-07T17:09:33.718Z",
      "version": "smpte-idams-publication@v1"
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    "authors": [
      {
        "name": "Simon Thompson"
      },
      {
        "name": "Peter Cherriman"
      }
    ],
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      "confidence": "high",
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      "version": "smpte-idams-publication@v1"
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    "contentType": "orig-research",
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      "version": "smpte-idams-publication@v1"
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    "copyright": {
      "holder": "SMPTE",
      "holder$meta": {
        "confidence": "high",
        "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
        "source": "parsed",
        "updated": "2026-10-07T17:09:33.718Z",
        "version": "smpte-idams-publication@v1"
      },
      "year": "2018",
      "year$meta": {
        "confidence": "high",
        "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
        "source": "parsed",
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        "version": "smpte-idams-publication@v1"
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      "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
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      "version": "smpte-idams-publication@v1"
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    "docId": "10.5594-JMI.2018.2798518",
    "docId$meta": {
      "confidence": "high",
      "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
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      "version": "smpte-idams-publication@v1"
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    "docLabel": "SMPTE Motion Imaging Journal ( Volume: 127, Issue: 3, April 2018)",
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      "confidence": "high",
      "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
      "source": "parsed",
      "updated": "2026-10-07T17:09:33.718Z",
      "version": "smpte-idams-publication@v1"
    },
    "docTitle": "Access Services for UHDTV: An Initial Investigation of W3C TTML2 Subtitles (Closed-Captions)",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
      "source": "parsed",
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      "version": "smpte-idams-publication@v1"
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    "docType": "Journal Article",
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      "source": "parsed",
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    "doi": "10.5594/JMI.2018.2798518",
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    "href": "https://doi.org/10.5594/JMI.2018.2798518",
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      "confidence": "high",
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    "issn": {
      "electronic": "2160-2492",
      "electronic$meta": {
        "confidence": "high",
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        "version": "smpte-idams-publication@v1"
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      "print": "1545-0279",
      "print$meta": {
        "confidence": "high",
        "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
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    "issn$meta": {
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    "journalAcronym": "MIJR",
    "journalAcronym$meta": {
      "confidence": "high",
      "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
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    "journalTitle": "SMPTE Motion Imaging Journal",
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    "keywords": [
      "Closed-captions",
      "EBU-TT-D",
      "HDR",
      "HLG",
      "ITU-R BT.2100",
      "Subtitles",
      "Video",
      "W3C TTML2"
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    "keywords$meta": {
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      "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
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    "number": "3",
    "number$meta": {
      "confidence": "high",
      "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
      "source": "parsed",
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      "version": "smpte-idams-publication@v1"
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    "pages": "47–54",
    "pages$meta": {
      "confidence": "high",
      "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
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      "version": "smpte-idams-publication@v1"
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    "publicationDate": "2018-04-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
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      "version": "smpte-idams-publication@v1"
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    "publisher": "SMPTE",
    "publisher$meta": {
      "confidence": "high",
      "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
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    "publisherLocation": {
      "city": "White Plains, NY",
      "city$meta": {
        "confidence": "high",
        "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
        "source": "parsed",
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        "version": "smpte-idams-publication@v1"
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      "country": "USA",
      "country$meta": {
        "confidence": "high",
        "note": "Ingested from SMPTE IDAMS <publication> (_source/SMPTE/Journal Article Repository/2018/7261654/8323429/08323491.xml) via idamsIngest.js",
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