You will see, in social media especially, occasional use of "open captions" or "burned-in subtitles" which are part of the videos themselves, so in those cases, the resolution of the text is dependent on the overall resolution of the visual experience. - Larry <http://www.verizonmedia.com/> Larry Goldberg Senior Director and Head of Accessibility Verizon Media 978 844 0744 31 St. James Avenue, 11th floor Boston, MA 02110 On Fri, Jul 16, 2021 at 12:23 PM Raja Kushalnagar < raja.kushalnagar@gallaudet.edu> wrote: > DVD/Blu-Ray captions/subtitles were saved and displayed as bitmaps. I > can't think of any recent technology that uses bitmaps for > captions/subtitles. > > On Fri, Jul 16, 2021 at 6:11 AM Joshue O'Connor <joconnor@w3.org> wrote: > >> >> >> Larry Goldberg <larryg@verizonmedia.com> >> Friday 16 July 2021 03:27 >> I'll add one basic (and obvious) fact: >> Most captions are transmitted in the form of data which represent the >> characters and which include metadata that gives instructions to local >> hardware as to how to render the data as displayed text. >> As the characters themselves are rendered locally, bandwidth issues are >> not relevant to resolution of the text itself. For TV and streaming, the >> actual fonts, characters, resolution etc. are entirely dependent on the >> local character generator built into the hardware, unless the text itself >> is sent as bitmapped video. >> >> Thanks Larry - that is a sensible point. I guess we are looking for any >> potential gotchas that may relate to the WebXR Layers API. >> >> Can you expand on contexts where text may be sent as bitmapped video? >> That sounds resolution dependent. >> >> Thanks >> >> Josh >> >> >> -- >> Emerging Web Technology Specialist/Accessibility (WAI/W3C) >> >
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