TPAC2016/session-hdr-summary
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).