CSS Color 4
Adds calibrated RGB spaces (beyond sRGB)
display-p3, a98-rgb, prophoto-rgb, rec2020
Adds CIE Lab, LCH (D50, Bradford)
Sample code to reassure wary implementers
Discouraging "naive" CMYK to RGB conversion
By Chris Lilley, W3C
Adds calibrated RGB spaces (beyond sRGB)
display-p3, a98-rgb, prophoto-rgb, rec2020
Adds CIE Lab, LCH (D50, Bradford)
Sample code to reassure wary implementers
Adds colorspaces defined by downloadable ICC profiles
Several calibrated CMYK and n-color examples
device-cmyk redefined to use FOGRA-39 behind the scenes
Safari implements color(display-p3) since 2016; now implementing at least Lab, LCH
Chrome desire to implement, TAG review
Firefox asking pre-implementation, platform consistency questions
BFO (CSS to PDF) implements all of CSS Color 4
Test suite in development
Gamut mapping
Color serialization
Interpolation and currentColor
Choice of computational space (linear light XYZ, perceptually uniform Lab or LCH, legacy sRGB
color-mix mixes 2 colors (in LCH by default)
color-contrast finds most contrasting color (relative luminance) from a list
color-adjust & relative color syntax modifies a color
Unofficial draft, not yet adopted
Adds Rec BT.2100 with HLG or PQ
Adds ICTCP
Requires compositing in CIE XYZ (not sRGB!! or even NTSC!!!)
color-gamut media query (srgb |p3|rec2020)
dynamic-range media query (standard|high)
And for separate video planes: