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Exploring Tonal Palettes

HCT

HCT is a color model developed by [Google][material-hct]. It aims to solve a problem related to generating color palettes with good contrast. While HCT may seem like a revolutionary color model, the idea behind it is quite simple, take the perceptually uniform color model CAM16 and combine it with the CIE Lab's lightness.

Upside of HCT

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DPS CONTRAST (DELTA PHI STAR) LICENSE

DPS Contrast, also known as Delta Phi Star, is a simple formula for predicting human visual perception of contrast between text and background.

WHAT WHERE HOW
- Delta Phi Star predicts the contrast of text against the background for a given pair of colors.
- Delta Phi Star emerged from the SAPC/APCA project developing new standards for better beat ability on the web.
- Delta Phi Star takes in two $L^*$ (Lstar) values, and returns an $L^c$ (lightness contrast) value.
UNIFORMITY:
DPS Contrast is quasi-uniform for human perception of text against a background on a self-illuminated display

"""XYB color space."""
from __future__ import annotations
from coloraide import algebra as alg
from coloraide.spaces import Space
from coloraide.types import Vector
from coloraide.cat import WHITES
from coloraide.channels import Channel, FLG_MIRROR_PERCENT
from coloraide import Color as Base

	from coloraide import Color as Base

	class Color(Base):
	FIT = 'oklch-chroma'
	POWERLESS = True
	CARRYFORWARD = True

	print('==== Case 1 ====')
	color = Color.interpolate(['oklch(100% 50% 60deg)', 'oklch(50% 50% 0deg)'], space='oklch', out_space='oklch')(0.5)
	Row([color.to_string(percent=True), color.convert('srgb').to_string()])

	# pragma: init
	"""Custom sRGB color class."""
	from coloraide import Color as Base
	from coloraide.spaces.srgb.css import sRGB
	from coloraide.css import serialize
	from coloraide import algebra as alg
	import re

	RE_CUSTOM = re.compile(r'(?i)\b([a-z][a-z_]{2,})\b')

	# pragma: init
	"""
	Okhsl/Okhsv class.

	Adapted to Python and ColorAide and adjusted to P3 by Isaac Muse 2023.

	---- License ----

	Copyright (c) 2021 Björn Ottosson

	# pragma: init
	from coloraide import Color as Base
	from coloraide.cat import WHITES
	from coloraide.spaces import Space
	from coloraide import algebra as alg
	from coloraide.types import Vector
	from coloraide.channels import Channel
	from coloraide import Color as Base

	# pragma: init
	"""Convert Linear sRGB to LMS using Smith & Pokorny (1975) 2-deg cone fundamentals."""
	from __future__ import annotations
	from coloraide.cat import WHITES
	from coloraide.spaces import Space
	from coloraide import algebra as alg
	from coloraide.types import Vector
	from coloraide.channels import Channel

	LRGB_TO_LMS = [