TPAC2016/session-hdr-summary

From W3C Wiki

High Dynamic Range (HDR) on the Web

What is HDR

High-dynamic-range (HDR) is a technique used in video, imaging and photography to reproduce a greater dynamic range of luminosity than is possible with standard (SDR) video, digital imaging or photographic techniques.

What has changed since last year

  • CSS4 color with

* ICC support * CIE Lab * Working colorspace * Bit-depth neutral numbers

  • Convergence of Movie/TV, Digital Imaging, Web
  • ICC moving beyond print focus and D50 colorimetry

* ICCMax * spectral imaging * measurement conditions * viewing conditions * beyond paper white * compositing

  • Hardware support at volume

What do we need

  • HDR video on the web

* BT.2100 * PQ and log-gamma transfer function

  • HDR images (stills, photography)
  • CSS matching colors in the above
  • Compositing in linear-light colorspace
  • Compositing SDR with HDR
  • Fallback for SDR display

* Responsive images * Media Queries

  • HDR support in opensource codebases

* porting to TV does not add new major features

  • Developer awareness and guidance

* access to deep color, high bitdepth displays

  • Image format support for HDR

* freely implementable * HDR support (10bit PQ) * good compression * animation a plus

Next steps (two CGs)

  • Background explainer

* for the lightly yinterested developer * pointers to more information

  • Image format requirements

Next steps (liaisons)

  • W3C and ICC on Web profile of ICCMax
  • Continued review of CSS4 Color and CSS5 Color

Participants: Leonard Rosenthal (Adobe); Chris Needham (BBC); Mark Vickers (Comcast); Mike Assenti (Dolby); Stefan Håkansson (Ericsson); Lea Verou (Invited Expert, CSS); Frank Olivier (Microsoft); Mark Watson (Netflix); Chris Lilley (W3C); Liam Quin (W3C); Bert Bos (W3C); Florian Rivoal (Vivliostyle).