Luv
The Luv color space is not registered in Color by default
Properties
Name: luv
White Point: D65 / 2˚
Coordinates:
| Name | Range* |
|---|---|
l | [0, 100] |
u | [-215, 215] |
v | [-215, 215] |
* Space is not bound to the range and is only used as a reference to define percentage inputs/outputs in relation to the Display P3 color space.
The sRGB gamut represented within the CIELuv D65 color space.
CIELuv is similar to CIELab as they were both developed in 1976 as perceptually uniform color spaces, both are derived from the color experiments in 1931 that brought us the XYZ color space, and neither are truly perceptually uniform.
The difference between the two comes from their intent. CIELab attempted to create a space that aligned well with human vision. CIELuv, on the other hand, was designed to be an easier-to-compute transformation of the 1931 CIE XYZ color space.
CIELab is more commonly used in subtractive color applications (printed pages, dyes, etc.), while CIELuv is better suited in additive color applications such as display colorimetry (monitors, TVs, etc.).
Channel Aliases
| Channels | Aliases |
|---|---|
l | lightness |
u | |
v |
Input/Output
As CIELuv D65 is not currently supported in the CSS spec, the parsed input and string output formats use the color() function format using the custom name --luv:
color(--luv l u v / a) // Color function
When manually creating a color via raw data or specifying a color space as a parameter in a function, the color space name is always used:
Color("luv", [0, 0, 0], 1)
The string representation of the color object and the default string output use the color(--luv l u v / a) form.
>>> Color("luv", [53.237, 175.01, 37.765])
color(--luv 53.237 175.01 37.765 / 1)
>>> Color("luv", [74.934, 74.839, 74.014]).to_string()
'color(--luv 74.934 74.839 74.014)'
Registering
from coloraide import Color as Base
from coloraide.spaces.luv import Luv
class Color(Base): ...
Color.register(Luv())