Re: Proposal for HTMLCanvasElement HDR compositing modes

With the change in terminology described in my reply to Lars, does the
general scheme of the proposal feel like a good fit?




On Mon, Mar 15, 2021 at 8:53 PM Jim Helman <jhelman@movielabs.com> wrote:

> Hi,
>
> I agree. Scene light has a very specific definition in the context of
> capture and in the color grading/correction world. In our context here, we
> should avoid getting into mappings from scene-referred to display-referred
> systems, which are usually highly subjective and depend on the desired
> creative "look."
>
> - Jim
> On 3/15/21 8:26 PM, Lars Borg wrote:
>
> Chris C,
>
>
>
> One concern I have is the term scene light.
>
> If this means scene-referred, then that’s a problem as sRGB is defined
> only for display light, not for scene light.
>
> So then additional conversions would be needed to convert sRGB to canvas.
>
> And if scene light doesn’t mean scene-referred then what does it mean? It
> causes confusion.
>
> Please find a way to stay in display-referred color space.
>
>
>
> Lars
>
>
>
> *From: *Christopher Cameron <ccameron@google.com> <ccameron@google.com>
> *Date: *Sunday, March 14, 2021 at 8:30 PM
> *To: *"public-colorweb@w3.org" <public-colorweb@w3.org>
> <public-colorweb@w3.org> <public-colorweb@w3.org>, Pierre Lemieux
> <pal@sandflow.com> <pal@sandflow.com>
> *Subject: *Re: Proposal for HTMLCanvasElement HDR compositing modes
> *Resent-From: *<public-colorweb@w3.org> <public-colorweb@w3.org>
> *Resent-Date: *Sunday, March 14, 2021 at 8:29 PM
>
>
>
> FYI, I have updated the PR to rely more heavily on standard broadcast
> terminology, and included a (hopefully-clarifying) definitions section at
> the top.
>
>
>
>
>
> On Wed, Mar 10, 2021 at 2:42 PM Christopher Cameron <ccameron@google.com>
> wrote:
>
> I put up a PR with a writeup of what I think is the best scheme for HDR
> compositing of HTMLCanvasElements, given our various constraints. Please
> review and/or comment for our next meeting on March 16!
>
> https://github.com/w3c/ColorWeb-CG/pull/15
> <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fw3c%2FColorWeb-CG%2Fpull%2F15&data=04%7C01%7Cborg%40adobe.com%7Cf4f9872e7f6a408760f808d8e77bbfcf%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C637513866045481738%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=vAN%2BA6ZzmQ4r%2F3m7SlyZVOU4s8nn5nu50rjT0S2XpfU%3D&reserved=0>
>
>
>
> --
>
> *Jim Helman * | MovieLabs | o: +1.650.646.2277 <(650)%20646-2277> m:
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