Re: Discuss HDR at CSS WG next week ?

On Tue, Sep 20, 2016 at 2:08 PM, Chris Lilley <chris@w3.org> wrote:

>
>
> On 2016-09-20 13:53, Mark Watson wrote:
>
>
> ​I think the two things which came up specifically with the color
> specification were:
> (i) the predefined "dci-p3" profile is mis-named. There should be some
> changes to clarify that this is not DCI P3, but rather a profile defined in
> this specification which makes used of the DCI P3 color primaries​. You
> could call it "web-p3" or "display-p3" or whetever.
>
> Yes, agreed. i discussed that with Dean from Apple today, he is sending me
> an ICC profile that defines it. And certainly it needs to be renamed.
>
> (ii) when the update to iccMax is done, it would be good to have at least
> one predefined profile for HDR (e.g. BT.2100 / PQ), especially since I
> heard at least one implementor say they did not intend to implement
> arbitrary ICC profiles, but rather just the predefined ones
>
>
> Yes, also agreed (but that will likely be in a later version of the spec,
> because IccMax is a bit early to rely on while ICC v.4 is mature).
>
> It is certainly possible to start a css color 5 as a placeholder for that
> sort of thing, in parallel with css color 4 development.
>
>
> The question of where to map the SDR / sRGB luminance range when
> compositing with HDR is unsolved. It may be that for consistent results
> across platforms this needs to be specified.
>
> Yes. That would likely be in a new level of the compositing spec.
>
> But there needs to be a period of experimentation on that before we could
> conclude either that specification is needed or that CSS color is a good
> place to specify it.
>
>
> Yes.
>

Chris, can you open these as issues on https://github.com/w3c/csswg-drafts so
that we don't lose track of them?