Re: Problem with rec2100-pq to srgb

Hi Lars,

CIL.

Best,

-- Pierre

On Wed, Apr 19, 2023 at 1:31 PM Lars Borg <borg@adobe.com> wrote:
>
> The text says:
> Tone mapping from rec2100-pq to srgb is performed using the following steps:
> apply the Parametric Tone Mapping Method specified at SMPTE ST 2094-10, Annex B
>
> This has some problems:
> 1. The status of Annex B is informative. It is neither a standardized nor a recommended approach.
> Is it proper to reference such a weak text here?
>

The method is just a recommendation, so referencing an informative
annex is appropriate.

Other methods are possible, including Method A specified at Rec. ITU-R BT.2446.

> 2. The method requires a value AveragePqencodedMaxrgb, which is not included in the canvas metadata set.

Yes, a note has been added on this topic:

https://github.com/w3c/ColorWeb-CG/blob/514a1e6d62753195225421de23a7c8c218890f99/hdr_html_canvas_element.md#from-hdr-to-sdr-color-spaces

>
> Lars
>
>
> -----Original Message-----
> From: Pierre Lemieux <pal@sandflow.com <mailto:pal@sandflow.com>>
> Date: Tuesday, April 18, 2023 at 8:14 PM
> To: "public-colorweb@w3.org <mailto:public-colorweb@w3.org>" <public-colorweb@w3.org <mailto:public-colorweb@w3.org>>
> Subject: Telecon reminder
> Resent-From: <public-colorweb@w3.org <mailto:public-colorweb@w3.org>>
> Resent-Date: Tuesday, April 18, 2023 at 8:13 PM
>
>
> EXTERNAL: Use caution when clicking on links or opening attachments.
>
>
>
>
> Good morning/evening,
>
>
> Quick reminder of our call on Wednesday UTC.
>
>
> Below and attached are the most recent revisions of the minimal
> stramwan we plan on reviewing:
>
>
> https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fw3c%2FColorWeb-CG%2Fblob%2Fbf420a5c503de00baa165878195d892964e9d2c0%2Fhdr_html_canvas_element.md&data=05%7C01%7Cborg%40adobe.com%7C8c444a97f7db48a74b8508db409d4a97%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C638174816694890778%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=ykFFYS2PcCxzJz7p7z8OYVlndfTtV7B%2B2e6zGCZSo6E%3D&reserved=0 <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fw3c%2FColorWeb-CG%2Fblob%2Fbf420a5c503de00baa165878195d892964e9d2c0%2Fhdr_html_canvas_element.md&amp;data=05%7C01%7Cborg%40adobe.com%7C8c444a97f7db48a74b8508db409d4a97%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C638174816694890778%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=ykFFYS2PcCxzJz7p7z8OYVlndfTtV7B%2B2e6zGCZSo6E%3D&amp;reserved=0>
>
>
> Best,
>
>
> -- Pierre
>
>

Received on Thursday, 20 April 2023 00:38:37 UTC