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This implements the gamut mapping algorithm according to CSS Level 4 specification.

from coloraide.gamut import Fit
from coloraide.util import NaN


class OklchChroma(Fit):
    """Lch chroma gamut mapping class."""

Color Notebook

ColorAide's documentation is rendered with Python Markdown and Pymdown Extensions. The color notebook implements a dynamic, live environment allowing for on the fly page rendering and interactive Python code examples with beautiful visualization of color. This is accomplished by using Pyodide to execute the required Python modules to render the desired pages.

Though Pyodide is used to run the Python code, the actual code is handled special so that we can intercept color objects at various times and translate them to color swatches and gradients. Because of this, asynchrounous code is not really handled

	inputs = ['red', 'orange', 'yellow', 'green', 'blue', 'indigo', 'violet']
	colors = Color.steps(inputs, steps=10, space='srgb')
	HtmlRow(colors)
	HtmlRow([c.filter('brightness', 0.5).clip() for c in colors])
	HtmlRow([c.filter('saturate', 0.5).clip() for c in colors])
	HtmlRow([c.filter('contrast', 1.2).clip() for c in colors])
	HtmlRow([c.filter('opacity', 0.5).clip() for c in colors])
	HtmlRow([c.filter('invert', 1).clip() for c in colors])
	HtmlRow([c.filter('hue-rotate', 90).clip() for c in colors])
	HtmlRow([c.filter('sepia', 1).clip() for c in colors])

	"""CAM16 class."""
	import math
	from coloraide.spaces import Space, Labish
	from coloraide.distance import DeltaE
	from coloraide.cat import WHITES
	from coloraide.channels import Channel, FLG_ANGLE
	from coloraide import util
	from coloraide import algebra as alg
	from coloraide.types import Vector, VectorLike
	from typing import Optional

	from coloraide.contrast import ColorContrast

	class Weber(ColorContrast):
	"""Weber contrast."""

	NAME = "weber"

	@classmethod
	def contrast(cls, color1, color2, **kwargs):
	"""Contrast."""

	inputs = ['red', 'orange', 'yellow', 'green', 'blue', 'indigo', 'violet']
	colors = Color(inputs[0]).steps(inputs[1:], steps=20, space='srgb')
	colors
	ColorRow()
	[c.cvd('achromatopsia').clip() for c in colors]
	ColorRow()
	[c.cvd('brettel-protan').clip() for c in colors]
	ColorRow()
	[c.cvd('brettel-deutan').clip() for c in colors]
	ColorRow()

	print('---- Gamut Mapping with Oklch ----')
	class Color2(Color):
	FIT = "oklch-chroma"
	colors = ['green', 'blue']
	Color2.interpolate(colors, space="lab")
	Color2.interpolate(colors, space="lch")
	Color2.interpolate(colors, space="oklab")
	Color2.interpolate(colors, space="oklch")

	print('---- Gamut Mapping with CIE LCH ----')

	from coloraide.gamut import Fit, clip_channels
	from coloraide.util import NaN


	class OklchChroma(Fit):
	"""Lch chroma gamut mapping class."""

	NAME = "oklch-chroma"

	EPSILON = 0.0001

	from coloraide.distance.delta_e_76 import DE76
	from coloraide.gamut.fit_lch_chroma import LchChroma
	from coloraide import Color as OrigColor


	class DEOK(DE76):
	"""Delta E OK class."""

	NAME = "ok"
	SPACE = "oklab"