Re: Agenda, TPAC 2019 ColorWeb CG Meeting.

Hi Leonard,

On 2019-09-16 18:36, Leonard Rosenthol wrote:
> Chris - will there be a call in ability for the CG meeting?    I had hoped to be in Japan for the meeting, but something came up...but as these topics are important, I want to be sure to participate.

Unfortunately no, there are no call-in facilities for the Community 
Group meetings.


> On item #3 (Image formats), other than "supporting stills from a movie or HDR photography", are there any requirements for this format?   Also, do you (or anyone) have any proposals/recommendations?  Of the few that I have seen, there does not appear to be consensus amongst implementors...
>
> Thanks,
> Leonard
>
> On 9/16/19, 2:27 PM, "Chris Lilley" <chris@w3.org> wrote:
>
>      I had hoped that the ICC white paper on HDR with ICC would be available
>      for discussion by this community group. Alas, that document does not yet
>      have consensus within ICC so has not yet been published. Once it is, I
>      will send a link to this CG for discussion.
>      
>      Topics which would be particularly useful to discuss:
>      
>      * Working Colorspace in CSS Color 4
>      
>      For Web compat, things like compositing, gradients, anti-aliasing, and
>      general color interpolation defaults to sRGB. This is not a linear
>      space, so the results of computations are wrong. A new CSS property,
>      working-colorspace, would allow this to be altered. This is particularly
>      needed if any element is in a wider gamut colorspace.
>      
>      There have been various suggestions for suitable values. XYZ would
>      clearly work and would not clip. linear sRGB with headroom and footroom
>      to represent out of gamut colors would also work.
>      
>      * HDR and the Web, compositing SDR with HDR
>      
>      Typical use cases include showing some information (subtitles, actor bio
>      as a Web page) composited on top of HDR video. HDR (at least in PQ
>      encoding) uses absolute luminance, so where should sRGB white be placed?
>      Clearly not at 80 nits, clearly not at 4000 nits or whatever the display
>      is capable of for small hilights, and probably not at 1200 nts or
>      whatever full-screen value the display is capable of. How should that
>      work with HLG? What is the influence of scene metadata on this compositing?
>      
>      * Image formats for HDR
>      
>      Still images, such as stills from a movie or HDR photography, need to be
>      displayed on the Web. Ideally, W3C would not develop a new format but
>      use an existing, open, widely implementable one.
>      
>      --
>      Chris Lilley
>      @svgeesus
>      Technical Director @ W3C
>      W3C Strategy Team, Core Web Design
>      W3C Architecture & Technology Team, Core Web & Media
>      
>      
>      
>
-- 
Chris Lilley
@svgeesus
Technical Director @ W3C
W3C Strategy Team, Core Web Design
W3C Architecture & Technology Team, Core Web & Media

Received on Tuesday, 17 September 2019 06:02:39 UTC