[w3ctag/design-reviews] Adding support for High Dynamic Range (HDR) imagery to HTML Canvas (Issue #917)

こんにちは TAG-さん!

The [Color on the Web CG](https://www.w3.org/community/colorweb/) is kindly requesting a TAG review of its proposed modification to the Web Platform to *support for High Dynamic Range (HDR) imagery to HTML Canvas*.

The complete proposal is at https://github.com/w3c/ColorWeb-CG/blob/hdr_canvas_r2/hdr_html_canvas_element.md

Today [HTML Canvas](https://html.spec.whatwg.org/multipage/canvas.html#imagedata) supports only 8 bit per color channel and two `PredefinedColorSpace` color spaces (`srgb and display-p3`). This is insufficient for High-Dynamic Range (HDR) imagery, which is in widespread use today. Accordingly, the following API modifications are needed to manipulate HDR images in HTML Canvas:

* add BT.2100 color spaces to `PredefinedColorSpace`
* add higher bit depth capabilities to `CanvasRenderingContext2DSettings`
* add higher bit depth capabilities to `ImageDataSettings`
* add image color volume information to `ImageDataSettings` and `CanvasRenderingContext2DSettings`
* add display color volume information to the `Screen` interface of the CSS Object Model, to determine the characteristics of the display on which the image is being reproduced

Please note that the proposed `screenColorInfo` property adds a fingerprinting surface. This feature is however intended primarily for advanced color volume mapping applications and is not believed to be generally necessary.

Contacts: @palemieux and @svgeesus (Color on the Web CG co-chairs)

Feedback, issues and questions are welcome at mailto:public-colorweb@w3.org and https://github.com/w3c/ColorWeb-CG/issues.


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