Explainer

https://github.com/w3c/ColorWeb-CG/blob/main/hdr-big-picture.md

Links

The ColorWeb CG would like a TAG review of the "HDR on the web, the big picture" constellation of explainers.

This is an evolution of work previously reviewed by the TAG in https://github.com/w3ctag/design-reviews/issues/917.

• Many of the topics from that review have been completed (e.g, high bit depth support for 2D canvas, WebGL, and ImageData, ergonomic color spaces for HDR canvases, etc).
• Some features have been abandoned due to security and privacy concerns that arose in TAG review

The specification document includes:

• Background to topic of HDR on the web
• Example user applications
• Alternatives considered for some API surfaces
• Privacy and security discussion
• Testing strategy

The specification

• Follows the Web Platform Design Principles.
• Includes Security and Privacy Considerations sections based on answers to the Security/Privacy Questionnaire.

Where and by whom is the work is being done?

• GitHub repo: https://github.com/w3c/ColorWeb-CG
• Primary contacts:
  • Christopher Cameron @ccameron-chromium, ColorWeb CG chair
  • Chris Lilley @svgeesus, ColorWeb CG chair
• Primary standards group developing this feature: Color on the web Community Group
• Incubation and standards groups that have discussed the design: WebGL and WebGPU working groups

Feedback so far

• Multi-stakeholder feedback:
  • Chromium comments: Is the author of the proposal
  • Mozilla comments: https://github.com/mozilla/standards-positions/issues/1359
  • WebKit comments: https://github.com/WebKit/standards-positions/issues/618

You should also know that...

This is an overarching proposal that has the goal of covering HDR for 2D canvas, WebGL, and WebGPU in a coherent way. The "big picture" document linked above has much of the background. The individual features for each API are discussed the overarching document, and then the API-specific explainers are linked to. Below is a reproduction of the individual feature explainer links.

• HDR resource importing and drawing
  • 2D canvas: https://github.com/w3c/ColorWeb-CG/blob/main/canvas-compositing-headroom.md
  • WebGL: https://github.com/w3c/ColorWeb-CG/blob/main/webgl-unpack-headroom.md
  • WebGPU: https://github.com/w3c/ColorWeb-CG/blob/main/webgpu-external-headroom.md
• HDR canvas display:
  • 2D canvas: https://github.com/w3c/ColorWeb-CG/blob/main/canvas-tone-map.md
  • WebGL: https://github.com/w3c/ColorWeb-CG/blob/main/webgl-drawing-buffer-tone-map.md
  • WebGPU is already shipping

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