Enhancement: provide wideGamut option to process in 16-bit linear colourspace

[lovell]

Proposed API:

sharp(input, { wideGamut: true })
  ...

This will convert input pixel values to a 16-bit linear colourspace (either RGB16 or scRGB), which has a wider gamut than non-linear sRGB. It will use an embedded input profile, if any, converted via the XYZ connection space.

Setting this to true might infer fastShrinkOnLoad: false but need to think about that.

The gamma docs need to be updated too.

See #1324 for custom input profile support.

See #1323 for custom output profile support.

[uasan]

Hi.
This function not implemented?
If I understand correctly, in the future it will be able to solve the problem of profile Display P3?
#218 (comment)

Thanks.

[lovell]

For anyone subscribed to or interested in this feature, I've updated the original description as I think wideGamut is what most people are really after, and use of e.g. RGB16 would infer a linear colourspace anyway.