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    "abstract": "Ultra High Definition Television and High Dynamic Range has 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 HLG high dynamic range video in Appendix P of the W3C Timed Text Markup Language version 2 working draft specification which is likely to be used for subtitling in traditional and 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.",
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    "authors": [
      {
        "affiliation": "British Broadcasting Corporation, United Kingdom",
        "name": "Simon Thompson"
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        "affiliation": "British Broadcasting Corporation, United Kingdom",
        "name": "Peter Cherriman"
      }
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      "holder": "Society of Motion Picture and Television Engineers, Inc.",
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    "docTitle": "Access Services for UHDTV: an Initial Investigation of W3C TTML2 Subtitles (Closed-Captions)",
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    "isbn": {
      "print": "978-1-61482-959-1",
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    "publicationDate": "2017-10-23",
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