Re: Proposal for HTMLCanvasElement HDR compositing modes

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>
> *Date: *Sunday, March 14, 2021 at 8:30 PM
> *To: *"public-colorweb@w3.org" <public-colorweb@w3.org>, Pierre 
> Lemieux <pal@sandflow.com>
> *Subject: *Re: Proposal for HTMLCanvasElement HDR compositing modes
> *Resent-From: *<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 <mailto: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 m: +1.650.576.1755 | 
*jhelman@movielabs.com* | 222 Kearney St, Suite 300, San Francisco, CA 
94108