d3.lab()

d3.lab(l, a, b[, opacity])
d3.lab(specifier)
d3.lab(color)

Constructs a new Lab color. The channel values are exposed as l, a and b properties on the returned instance. Use the Lab color picker to explore this color space.

If l, a and b are specified, these represent the channel values of the returned color; an opacity may also be specified. If a CSS Color Module Level 3 specifier string is specified, it is parsed and then converted to the Lab color space. See color for examples. If a color instance is specified, it is converted to the RGB color space using color.rgb and then converted to Lab. (Colors already in the Lab color space skip the conversion to RGB, and colors in the HCL color space are converted directly to Lab.)