CIE 1964 UVW
Properties
Name: uvw
White Point: D65
Coordinates:
| Name | Range* |
|---|---|
u |
[-100.0, 100.0] |
v |
[-100.0, 100.0] |
w |
[0.0, 100.0] |
* Range is currently quite arbitrary.
Figure 1. The sRGB gamut represented within the UVW color space.
Note
It is a bit uncertain as to why the 3D model shows a number of values resolving to a black bulb under the shape,
but the translation has been compared against some other libraries that have implemented the space, and it seems to
align 
.
Wyszecki invented the UVW color space in order to be able to calculate color differences without having to hold the luminance constant. He defined a lightness index W* by simplifying expressions suggested earlier by Ladd and Pinney, and Glasser et al.. The chromaticity components U* and V* are defined such that the white point maps to the origin, as in Adams chromatic valence color spaces.
Channel Aliases
| Channels | Aliases |
|---|---|
u |
|
v |
|
w |
Input/Output
The UVW space is not currently supported in the CSS spec, the parsed input and string output formats use the
color() function format using the custom name --uvw:
color(--uvw u v w / a) // Color function
The string representation of the color object and the default string output use the
color(--uvw u v w / a) form.
>>> Color("uvw", [171.8, 24.715, 52.261])
color(--uvw 171.8 24.715 52.261 / 1)
>>> Color("uvw", [73.871, 48.705, 73.965]).to_string()
'color(--uvw 73.871 48.705 73.965)'
Registering
from coloraide import Color as Base
from coloraide_extras.spaces.uvw import UVW
class Color(Base): ...
Color.register(UVW())