IgPgTg

The IgPgTg color space is not registered in Color by default

Properties

Name: ipt

White Point: D65 / 2˚

Coordinates:

Name	Range
`ig`	[0, 1]
`pg`	[-1, 1]
`tg`	[-1, 1]

^* Space is not bound to the range and is only used as a reference to define percentage inputs/outputs.

IgPgTg uses the same structure as IPT, an established hue-uniform color space utilized in gamut mapping applications. While IPT was fit to visual data on the perceived hue, IgPgTg was optimized based on evidence linking the peak wavelength of Gaussian-shaped light spectra to their perceived hues.

Learn more.

Channel Aliases

Channels	Aliases
`ig`	`intensity`
`pg`	`protan`
`tg`	`tritan`

Input/Output

The IgPgTg 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 --igpgtg:

color(--igpgtg ig pg tg / a)  // Color function

The string representation of the color object and the default string output use the color(--igpgtg ig pg tg / a) form.

>>> Color("igpgtg", [0.54834, 0.15366, 0.43674])
color(--igpgtg 0.54834 0.15366 0.43674 / 1)
>>> Color("igpgtg", [0.73238, 0.0397, 0.32108]).to_string()
'color(--igpgtg 0.73238 0.0397 0.32108)'

Registering

from coloraide import Color as Base
from coloraide.spaces.igpgtg import IgPgTg

class Color(Base): ...

Color.register(IgPgTg())