ICtCp

The ICtCp color space is registered in Color by default

Properties

Name: ictcp

White Point: D65 / 2˚

Coordinates:

Name	Range^*
`i`	[0, 1]
`ct`	[-0.5, 0.5]
`cp`	[-0.5, 0.5]

^* Space is not bound to the above, defined range but represents a practical range for HDR color spaces.

ICtCp is a color space format with better perceptual uniformity than CIELab and is used as a part of the color image pipeline in video and digital photography systems for high dynamic range (HDR) and wide color gamut (WCG) imagery. It was developed by Dolby Laboratories from the IPT color space by Ebner and Fairchild. It was designed with the intention to replace YCbCr.

Learn about ICtCp

Channel Aliases

Channels	Aliases
`i`	`intensity`
`ct`	`tritan`
`cp`	`protan`

Input/Output

Parsed input and string output formats support all valid CSS forms in addition to allowing the color() function format as well using the custom name --ictcp.

ictcp(i ct cp / a)          // ICtCp function
color(--ictcp i ct cp / 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("ictcp", [0, 0, 0], 1)

The string representation of the color object will always default to the color(--ictcp i ct cp / a) form, but the default string output will be the ictcp(i ct cp / a) form.

>>> Color("ictcp", [0.42788, -0.1157, 0.27873])
color(--ictcp 0.42788 -0.1157 0.27873 / 1)
>>> Color("ictcp", [0.50498, -0.20797, 0.11073]).to_string()
'ictcp(0.50498 -0.20797 0.11073)'
>>> Color("ictcp", [0.56983, -0.25169, 0.03788]).to_string(percent=True)
'ictcp(56.983% -50.338% 7.576%)'
>>> Color("ictcp", [0.39138, -0.24061, -0.04423]).to_string(color=True)
'color(--ictcp 0.39138 -0.24061 -0.04423)'

Registering

from coloraide import Color as Base
from coloraide.spaces.ictcp.css import ICtCp

class Color(Base): ...

Color.register(ICtCp())