2021-01-12 Meeting notes + next meeting time/date

Good morning/evening,

Below are my notes from our meeting.

We will be meeting next on January 26 at 2100 UTC for 90 minutes.

The meeting will focus on HDR support in canvas. Please provide
input/slides by January 22 COB UTC.

Please contact me and Chris Lilley if you need additional information.

Best,

-- Pierre


Color on the web CG telecon notes -- 2021-01-12 UTC
===================================================

- attendees: Aous Naman, Chetan Nanda, Chris Needham, Chris Seeger,
Imane Mnie Filali, Jao-ke Chin-Lee, Joe Drago, Ken Russell, Lars Borg,
Miriam Suzanne, Phil (Green?), Chris Blume, Chris Cameron, Ken
Russell, Jao-Ke, Craig Revie, Craig Todd, John Simmons, Mark Watson,
Masaru Takechi, Chris Lilley, Pierre-Anthony Lemieux

- administrative
  - please carefully review CG rules/policies
(https://www.w3.org/community/about/)
  - please add your name to your GitHub user profile
(https://github.com/settings/profile)

- backlog grooming

  - https://github.com/w3c/ColorWeb-CG/issues/2
    - WebGL should adopt the same approach as Canvas

  - https://github.com/w3c/ColorWeb-CG/issues/5
    - Canvas is only SDR for now, but components values can go beyond [0, 1]
    - Canvas uses float32 since there are no float16 arrays in JavaScript

  - https://github.com/w3c/ColorWeb-CG/issues/7
    - The Pixel Format section currently only references Planar 4:2:0 YUV
    - AI: Sunny Sachanandani: ask Chris Cunningham re: roadmap for
color space and pixel formats for HDR/WCG

  - https://github.com/w3c/ColorWeb-CG/issues/8
    - WebGPU should adopt the same approach as Canvas

  - https://github.com/w3c/ColorWeb-CG/issues/9
    - ICC is working on adding CICP signaling to ICC v4 profiles as a new tag
      - adding signaling to existing 'para' tag would be break implementations
    - two challenges re: signaling colorspace in the ICC profile in
contrast to signaling colorspace directly in the image:
      - adds a level of indirection
      - ICC profile can/is be easily stripped
    - update report with a link to the revised ICC spec, when available

  - https://github.com/w3c/ColorWeb-CG/issues/11
    - AI: Chris Lilley to look into reviving PNG WG (discuss with W3C staff)
    - AI: Chris Blume to take a stab at a requirements document with
support from Pierre-Anthony Lemieux
      - proposed 4CC for the new chunk: cICP


- email thread re: support HDR [by creating] an idealized image meant
for display in the reference dim environment
  - https://lists.w3.org/Archives/Public/public-colorweb/2021Jan/0000.html

  - HDR support on Windows and MacOS differ
    - Windows
      - scRGB (float16 where scRGB (1.0, 1.0, 1.0) encodes the
standard D65 white at 80 nits)
      - UINT10/RGB10 with PQ/ST 2084 EOTF
    - MacOS
      - BT2020 extended linear where 1.0 = 100 nits

    - sample HDR images (signaled with CICP):
      - https://github.com/AOMediaCodec/av1-avif/tree/master/testFiles/Netflix/avif

    ? how should HDR be supported by canvas
      - consider non-PC platforms
      - members should prepare input for the next meeting

- W3C color workshop update (https://www.w3.org/Graphics/Color/Workshop/)
  - AI: Chris Lilley to send reminder email to reflector
  - members should consider presenting at the event

- next meeting: January 26 at 2100 UTC for 90 minutes
  -> focus on Canvas support for HDR

Received on Tuesday, 12 January 2021 18:07:10 UTC