Re: [w3ctag/design-reviews] Wide gamut support for Canvas/OffscreenCanvas/ImageBitmap (#315)

OK so of the three ways to do it:

a) extend sRGB function by not clamping to [0,1]
b) extend sRGB function by mirroring about 0
c) use a linear function, and more bits

this proposal is using b). This means it is well defined above 1 and below 0, can represent wider gamut colors that require a negative component value (typically red), and can represent a modest increase in maximum linear component value (the curve flattens off after 1). This is probably enough to deal with WCG and _may_ be enough to deal with HDR.

Please put that description into the proposal.

> This means that any program that was written in the sRGB color space can be changed to use the Extended-sRGB color space with no extra modifications.

With _few_ modifications:

- remove any clamping of out of range colors
- use a higher bit depth

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