Color API

`coloraide.NaN`

Description

NaN is a convenience constant for float('nan').

Import path

NaN is imported from the coloraide library:

from coloraide import NaN

`coloraide.stop`

class stop:
    def __init__(
        self,
        color: ColorInput,
        value: float
    ) -> None:
        ...

Description

stop objects are used in interpolate methods. They allow a user to specify a color stop for a given color during the interpolation process.

Import Path

stop is imported from coloraide library:

from coloraide import stop

Parameters

Parameters	Defaults	Description
`color`		A color string, a dictionary describing the color, or another `Color` class object.
`value`		A numerical value specifying the new color stop for the given color.

`coloraide.hint`

def hint(
    mid: float,
) -> Callable[..., float]:

Description

hint returns an easing function that adjust the midpoint between two color stops.

Import Path

hint is imported from coloraide library:

from coloraide import hint

Parameters

Parameters	Defaults	Description
`mid`		A numerical value, relative to the two color stops it occurs between. The value will be used as the new midpoint.

`coloraide.Color`

class Color:
    def __init__(
        self,
        color: ColorInput,
        data: VectorLike | None = None,
        alpha: float = util.DEF_ALPHA,
        **kwargs: Any
    ) -> None:
        ...

Description

The Color class object is a wrapper around the internal color space objects. Color is the base Color object and only registers a select number of color spaces by default. It provides an API interface to allow users to specify and manipulate colors.

Import path

Color is imported from the coloraide library:

from coloraide import Color

Parameters

Parameters	Defaults	Description
`color`		A color string, a dictionary describing the color, or another `Color` class object. If given `data`, a string must be used and should represent the color space to use.
`data`	`None`	`data` accepts a list of numbers representing the coordinates of the color. If provided, `color` must be a string specifying the color space.
`alpha`	`1`	`alpha` accepts a number specifying the `alpha` channel. Must be used in conjunction with `data` or it will be ignored.

`coloraide.everything.ColorAll`

class ColorAll(Color):
    def __init__(
        self,
        color: ColorInput,
        data: VectorLike | None = None,
        alpha: float = util.DEF_ALPHA,
        **kwargs: Any
    ) -> None:
        ...

Description

The ColorAll class object is derived from Color and extends the registered color spaces to include all offered by ColorAide.

Import path

ColorAll is imported from the coloraide library:

from coloraide.everything import ColorAll

Parameters

Parameters	Defaults	Description
`color`		A color string, a dictionary describing the color, or another `ColorAll` class object. If given `data`, a string must be used and should represent the color space to use.
`data`	`None`	`data` accepts a list of numbers representing the coordinates of the color. If provided, `color` must be a string specifying the color space.
`alpha`	`1`	`alpha` accepts a number specifying the `alpha` channel. Must be used in conjunction with `data` or it will be ignored.

`Color.register`

def register(
    cls,
    plugin: Plugin | Sequence[Plugin],
    *,
    overwrite: bool = False,
    silent: bool = False
) -> None:
    ...

Description

Register a plugin(s).

Parameters

Parameters	Defaults	Description
`plugin`		A plugin instance or list of plugin instances to register.
`overwrite`	`False`	`overwrite` will allow an already registered plugin to be overwritten if the plugin to register specifies a `name` that is already used for registration.
`silent`	`False`	`silent` will avoid throwing an error if the `name` is already found and `overwrite` is set to `False` in the specified category.

`Color.deregister`

@classmethod
def deregister(
    cls,
    plugin: str | Sequence[str], *,
    silent: bool = False
) -> None:
    ...

Description

Remove an already registered plugin(s).

Parameters

Parameters	Defaults	Description
`plugin`		A string or list of strings that describe the plugin(s) to be removed. Strings should be in the format `category:name` where `category` is either `space`, `delta-e`, `cat`, `filter`, `contrast`, `interpolate`, or `fit` and `name` is the name the plugin was registered under. `` will remove all plugins and `category:` will remove all within a specific category.
`silent`	`False`	`silent` will avoid throwing an error if the `name` can not be found in the specified category.

`Color.match`

@classmethod
def match(
    cls,
    string: str,
    start: int = 0,
    fullmatch: bool = False
) -> ColorMatch | None:
    ...

Description

The match class method provides access to the color matching interface and allows a user to provide a color string and get back a ColorMatch object. ColorMatch objects contain three properties:

class ColorMatch:
    def __init__(
        self,
        color: Color,
        start: int,
        end: int
    ) -> None:
        ...

Parameter	Description
`color`	The `Color` object.
`start`	The starting point within the string buffer where the color was found.
`end`	The ending point within the string buffer where the color was found.

Match does not search the entire buffer, but simply matches at the location specified by start.

Parameters

Parameters	Defaults	Description
`string`		A string representing the color.
`start`	`0`	Accepts an integer offset into the provided string buffer to start the match.
`fullmatch`	`False`	A boolean which defines whether match must match to the end of the string buffer.

Return

Returns a ColorMatch object.

`Color.new`

def new(
    self,
    color: ColorInput,
    data: VectorLike | None = None,
    alpha: float = util.DEF_ALPHA,
    **kwargs: Any
) -> Color:
    ...

Description

The new class method exposes the interface of creating new color objects. Using new is the same as using Color().

Parameters

Parameters	Defaults	Description
`color`		A color string, or other `Color` class object. If given `data`, a string must be used and should represent the color space to use.
`data`	`None`	`data` accepts a list of numbers representing the coordinates of the color. If provided, `color` must be a string specifying the color space.
`alpha`	`1`	`alpha` accepts a number specifying the `alpha` channel. Must be used in conjunction with `data` or it will be ignored.

Return

Returns a Color object.

`Color.random`

@classmethod
def random(
    cls,
    space: str,
    *,
    limits: Sequence[Sequence[float] | None] | None = None
) -> Color:
    ...

Description

Generate a random color in the provided space. The color space's channel range will be used as a limit for the channel. For color spaces with no clearly defined gamut, these values can be arbitrary. In such cases, it may be advisable to fit the returned color space to a displayable gamut.

Parameters

Parameters	Defaults	Description
`space`		The color space name in which to generate a random color in.
`limits`	`None`	An optional list of constraints for various color channels. Each entry should either be a sequence contain a minimum and maximum value, or should be `None`. `None` values will be ignored and the color space's specified channel range will be used instead. Any missing entries will be treated as `None`.

Return

Returns a Color object.

`Color.clone`

def clone(
    self
):

Description: The clone method provides a way to create a duplicate of the current Color instance.
Return: Returns a Color object.

`Color.update`

def update(
    self,
    color: ColorInput,
    data: VectorLike | None = None,
    alpha: float = util.DEF_ALPHA,
    *,
    norm: bool = True,
    **kwargs: Any
) -> Color:
    ...

Description

The update method provides a way to update the underlying color space with coordinates from any color space. The method's signature is the same as new except that it adds an additional norm parameter used to skip achromatic hue normalization when converting to the current color space. The object itself will assume the equivalent color in the current color space that matches the input color's value (assuming no algorithmic limitations preventing an equivalent color).

Parameters

Parameters	Defaults	Description
`color`		A color string, or other `Color` class object. If given `data`, a string must be used and should represent the color space to use.
`data`	`None`	`data` accepts a list of numbers representing the coordinates of the color. If provided, `color` must be a string specifying the color space.
`alpha`	`1`	`alpha` accepts a number specifying the `alpha` channel. Must be used in conjunction with `data` or it will be ignored.
`norm`	`True`	When set to `False`, this prevents achromatic normalization when updating from a different color space. If no update occurs, nothing is done.

Return

Returns a reference to the current Color object.

`Color.mutate`

def mutate(
    self,
    color: ColorInput,
    data: VectorLike | None = None,
    alpha: float = util.DEF_ALPHA,
    **kwargs: Any
) -> Color:
    ...

Description

The mutate method is similar to update except that it does not convert the input color to the current color space, but instead replaces the current color space and values with the input color's color space and values.

Parameters

Parameters	Defaults	Description
`color`		A color string, or other `Color` class object. If given `data`, a string must be used and should represent the color space to use.
`data`	`None`	`data` accepts a list of numbers representing the coordinates of the color. If provided, `color` must be a string specifying the color space.
`alpha`	`1`	`alpha` accepts a number specifying the `alpha` channel. Must be used in conjunction with `data` or it will be ignored.

Return

Returns a reference to the current Color object.

`Color.convert`

def convert(
    self,
    space: str,
    *,
    fit: bool | str = False,
    in_place: bool = False,
    norm: bool = True
) -> Color:
    ...

Description

Converts a Color object from one color space to another. If the current color space matches the specified color space, a clone of the current color will be returned with no changes to the channel values. If in_place is True, the current object will be modified in place.

Parameters

Parameters	Defaults	Description
`space`		A string representing the desired final color space.
`fit`	`False`	Parameter specifying whether the current color should be gamut mapped into the final, desired color space. If set to `True`, the color will be gamut mapped using the default gamut mapping method. If set to a string, the string will be interpreted as the name of the gamut mapping method to be used.
`in_place`	`False`	Boolean specifying whether the convert should alter the current `Color` object or return a new one.
`norm`	`True`	When set to `False`, this prevents achromatic normalization when converting from a different color space. If no update occurs, nothing is done.

Return

Returns a reference to the converted Color object. If in_place is True, the return will be a reference to the current Color object.

`Color.space`

def space(
    self
) -> str:
    ...

Description: Retrieves the current color space name as specified by the underlying color space object.
Return: Returns a string with the name of the current color space.

`Color.normalize`

def normalize(
    self,
    *,
    nans: bool = True
) -> Color:
    ...

Description

Force normalization of a color's channels by forcing cylindrical colors with negative chroma/saturation to their positive form and setting hue to undefined if the color is achromatic. If nans is set to False, the hue normalization step (setting hue to undefined) will be skipped. Normalize modifies the current color in place.

Parameters

Parameters	Defaults	Description
`nans`	`True`	Perform hue normalization (setting hue to undefined if the color is achromatic).

Return

Returns a reference to the current Color object after normalizing the channels for undefined hues.

`Color.to_dict`

def to_dict(
    self,
    *,
    nans: bool = True
) -> Mapping[str, Any]:
    ...

Description

Dump the color object to a simple dictionary.

{
    'space': 'srgb',            # Color space name
    'coords': [1.0, 0.0, 0.0],  # Color channel values
    'alpha': 1.0                # Alpha channel value
}

Parameters

Parameters	Defaults	Description
`nans`	`True`	Return channel values having undefined values resolved as defined values.

Return

A dictionary containing the color space name and channel values.

`Color.to_string`

def to_string(
    self,
    **kwargs: Any
) -> str:
    ...

Description

Method that converts the current color to an output format supported by the color space. While a number of the parameters are common, some may be specific to the color space. The usage guide covers color space specific options in more details.

Parameters

Common parameters:

Parameters	Defaults	Description
`alpha`	`None`	Boolean or `None` value which determines whether the output includes `alpha`. If `None`, the default alpha will only be shown if less than 1. If `True`, alpha will always be shown. If `False`, alpha will be omitted.
`precision`	`5`	Integer value that sets precision and scale. Precision and scale will match the value if greater than zero. If `0`, values will be rounded to the nearest integer. If `-1`, number will be output at the highest precision.
`fit`	`True`	A boolean that controls whether gamut mapping is performed on string creation. By default, colors will be fit to their own color space. This can be disabled by setting to `False`.
`color`	`False`	A boolean that will determine if the `color(space coord+ / alpha)` format is used for string output. Has highest precedence.
`percent`	Varies	A boolean that will output color channels as percents. Not all color spaces support percents, or may support percents only in certain scenarios. Default value may be determined by the color space.

sRGB specific parameters:

Parameters	Defaults	Description
`hex`.	`False`	String output will be in `#RRGGBBAA` format.
`names`	`False`	Boolean indicating a preference for CSS color names. When translating a color to it's closest hex form, if that hex value matches a CSS color name, that color name will be returned as the output. `hex` does not have to be `True` for this to apply.
`compress`	`False`	If `hex` is `True` and `compress` is `True`, hex values will be compressed if possible: `#RRGGBBAA` → `#RGBA`.

Space dependent parameters:

Parameters	Defaults	Description
`comma`	`False`	If supported by the color space and the current output format, commas will be used instead of space format: `rgba(0, 0, 0, 1)` → `rgb(0 0 0 /1)`.

Return

Returns a string representation of the current color.

`Color.luminance`

def luminance(
    self,
    *,
    white: VectorLike | None = cat.WHITES['2deg']['D65']

) -> float:
    ...

Description

Get the relative luminance. Relative luminance is obtained from the Y coordinate in the XYZ color space. XYZ, in this case, has a D65 white point.

Parameters

Parameters	Defaults	Description
`white`	`None`	Specify the white in which to chromatically adapt the points from, if none is specified, the current color's white point is assumed.

Return

Returns an float indicating the relative luminance.

`Color.contrast`

def contrast(
    self,
    color: ColorInput,
    method: str | None = None
) -> float:
    ...

Description

Get the contrast ratio based on the relative luminance between two colors.

Parameters

Parameters	Defaults	Description
`color`		A color string or `Color` object representing a color.
`method`	`None`	Specify the method used to obtain the contrast value. If `None`, the default specified by the class will be used.

Return

Returns a float indicating the contrast ratio between two colors.

`Color.distance`

def distance(
    self,
    color: ColorInput,
    *,
    space: str = "lab"
) -> float:
    ...

Description

Performs a euclidean distance algorithm on two colors.

Parameters

Parameters	Defaults	Description
`color`		A color string or `Color` object representing a color.
`space`	`"lab"`	Color space to perform distancing algorithm in.

Return

Returns a float indicating euclidean distance between the two colors.

`Color.delta_e`

def delta_e(
    self,
    color: ColorInput,
    *,
    method: str | None = None,
    **kwargs: Any
) -> float:
    ...

Description

Performs a delta E distance algorithm on two colors. Default algorithm that is used is Delta E 1976 (76). Some methods have additional weighting that can be configured through method specific options which are represented by **kwargs.

Available methods:

Name	Input	Parameters
∆E^*_ab (CIE76)	`76`
∆E^*_cmc (CMC l:c (1984))	`cmc`	`l=2, c=1`
∆E^*₉₄ (CIE94)	`94`	`kl=1, k1=0.045, k2=0.015`
∆E^*₀₀ (CIEDE2000)	`2000`	`kl=1, kc=1, kh=1`
∆E_HyAB (HyAB)	`hyab`	`space="lab"`
∆E_ok	`ok`	`scalar=1`
∆E_itp (ICtCp)	`itp`	`scalar=720`
∆E_z (Jzazbz)	`jz`
∆E_99o (DIN99o)	`99o`
∆E_cam16	`cam16`	`model=ucs`
∆E_HCT	`hct`

Parameters

Parameters	Defaults	Description
`color`		A color string or `Color` object representing a color.
`method`	`None`	String that specifies the method to use. If `None`, the default will be used.
`**kwargs`		Any distancing specific parameters to pass to ∆E method.

Return

Returns a float indicating the delta E distance between the two colors.

`Color.closest`

def closest(
    self,
    colors: Sequence[ColorInput],
    *,
    method: str | None = None,
    **kwargs: Any
) -> Color:
    ...

Description

Given a list of colors, calculates the closest color to the calling color object.

Parameters

Parameters	Defaults	Description
`colors`		A list of color strings, `Color` object, or dictionary representing a color.
`method`	`None`	String that specifies the method of color distancing to use.
`**kwargs`		Any distancing specific parameters to pass to ∆E method.

Return

The Color that is closest to the calling color object. In the off chance that an empty list is passed in None will be returned.

`Color.mask`

def mask(
    self,
    channel: str | Sequence[str],
    *,
    invert: bool = False,
    in_place: bool = False
) -> Color:
    ...

Description

The mask method will set any and all specified channels to NaN. If invert is set to True, mask will set any and all channels not specified to NaN.

Parameters

Parameters	Defaults	Description
`channel`		A string specifying a channel, or a list of strings specifying multiple channels. Specified channels will be masked (or the only channels not masked if `invert` is `True`).
`invert`	`False`	Use inverse masking logic and mask all channels that are not specified.
`in_place`	`False`	Boolean used to determine if the current color should be modified "in place" or a new `Color` object should be returned.

Return

Returns a reference to the masked Color object. If in_place is True, the return will be a reference to the current Color object.

`Color.interpolate`

@classmethod
def interpolate(
    cls,
    colors: Sequence[ColorInput | interpolate.stop | Callable[..., float]],
    *,
    space: str | None = None,
    out_space: str | None = None,
    progress: Mapping[str, Callable[..., float]] | Callable[..., float] | None = None,
    hue: str = util.DEF_HUE_ADJ,
    premultiplied: bool = True,
    extrapolate: bool = False,
    domain: list[float] | None = None,
    method: str = "linear",
    padding: float | tuple[float, float] | None = None,
    carryforward: bool | None = False,
    powerless: bool | None = False,
    **kwargs: Any
) -> Interpolator:
    ...

Description

The interpolate method creates a function that takes a value between 0 - 1 and interpolates a new color based on the input value.

If more than one color is provided, the returned function will span the interpolations between all the provided colors with the same range of 0 - 1.

Interpolation can be customized by limiting the interpolation to specific color channels, providing custom interpolation functions, and even adjusting the hue logic used.

stop objects can wrapped around colors to specify new color stops and easing functions can be placed between colors to alter the transition progress between the two colors.

Hue Evaluation	Description
`shorter`	Angles are adjusted so that θ₂ - θ₁ ∈ [-180, 180].
`longer`	Angles are adjusted so that θ₂ - θ₁ ∈ {[-360, -180], [180, 360]}.
`increasing`	Angles are adjusted so that θ₂ - θ₁ ∈ [0, 360].
`decreasing`	Angles are adjusted so that θ₂ - θ₁ ∈ [-360, 0]
`specified`	No fixup is performed. Angles are interpolated in the same way as every other component.

The method of interpolation to can also be selected via the method parameter.

Method	Description
`linear`	An linear interpolation that employs piecewise logic to interpolate between two or more colors.
`bspline`	An interpolation method that employs cubic B-spline curves to calculate an interpolation path through multiple colors.
`natural`	A natural interpolation spline based on the cubic B-spline curve.
`monotone`	An interpolation method that utilizes a monotonic cubic spline based on the Hermite spline.
`catrom`	Interpolation based on the Catmull-Rom cubic spline.

Parameters

Parameters	Defaults	Description
`colors`		A list of color strings, `Color` objects, dictionaries representing a color, `stop` objects, or easing functions.
`space`	`"lab"`	Color space to interpolate in.
`out_space`	`None`	Color space that the new color should be in. If `None`, the return color will be in the same color space as specified by `space`.
`progress`	`None`	An optional function that that allows for custom logic to perform non-linear interpolation.
`hue`	`"shorter"`	Define how color spaces which have hue angles are interpolated. Default evaluates between the shortest angle.
`premultiplied`	`True`	Use premultiplied alpha when interpolating.
`extrapolate`	`False`	Interpolations should extrapolate when values exceed the domain range ([0, 1] by default).
`domain`	`None`	A list of numbers defining the domain range of the interpolation.
`method`	`"linear"`	The interpolation method to use.
`padding`	`None`	Adjust the padding of the interpolation range.
`carryforward`	`False`	Carry forward undefined channels when converting to the interpolation space. If `None`, will use the class default which is `False` by default.
`powerless`	`None`	Treat explicitly defined hues as powerless when the color is considered achromatic. If `None`, will use the class default which is `False` by default.

Return

Returns a function that takes a range within the specified domain, the default being [0..1]. The function returns a new, interpolated Color object.

`Color.steps`

@classmethod
def steps(
    cls,
    colors: Sequence[ColorInput | interpolate.stop | Callable[..., float]],
    *,
    steps: int = 2,
    max_steps: int = 1000,
    max_delta_e: float = 0,
    delta_e: str | None = None,
    delta_e_args: dict[str, Any] | None = None,
    **interpolate_args: Any
) -> list[Color]:
    ...

Description

Creates an interpolate function and iterates through it with user defined step parameters to produce discrete color steps. Will attempt to provide the minimum number of steps without exceeding max_steps. If max_delta_e is provided, the distance between each stop will be cut in half until there are no colors with a distance greater than the specified max_delta_e. The default ∆E method is used by default, but it can be changed with the delta_e parameter.

If more than one color is provided, the steps will be returned from the interpolations between all the provided colors.

Like interpolate, the default interpolation space is lab.

Parameters

Parameters	Defaults	Description
`color`		A list of color strings, `Color` objects, dictionaries representing a color, `stop` objects, or easing functions.
`steps`	`2`	Minimum number of steps.
`max_steps`	`1000`	Maximum number of steps.
`max_delta_e`	`0`	Maximum delta E distance between the color stops. A value of `0` or less will be ignored.
`delta_e`	`None`	A string indicating which ∆E method to use. If nothing is supplied, the class object's current default ∆E method will be used.
`delta_e_args`	`None`	A dictionary containing keyword arguments to be passed to the `delta_e` method.
`**interpolate_args`	See `interpolate`	Keyword arguments defined in `interpolate`.

Return

List of Color objects.

`Color.discrete`

@classmethod
def discrete(
    cls,
    colors: Sequence[ColorInput | interpolate.stop | Callable[..., float]],
    *,
    space: str | None = None,
    out_space: str | None = None,
    steps: int | None = None,
    max_steps: int = 1000,
    max_delta_e: float = 0,
    delta_e: str | None = None,
    delta_e_args: dict[str, Any] | None = None,
    domain: list[float] | None = None,
    **interpolate_args: Any
) -> Interpolator:
    ...

Description

Generates an interpolate function with discrete color scale. By default it assumes as many discrete colors as the user inputs, but steps can be used to generate more or less using the input colors. As discrete is built on steps, it takes all the same arguments.

Like interpolate, the default interpolation space is lab.

Parameters

Parameters	Defaults	Description
`color`		A list of color strings, `Color` objects, dictionaries representing a color, `stop` objects, or easing functions.
`space`	`"lab"`	Color space to interpolate in.
`out_space`	`None`	Color space that the new color should be in. If `None`, the return color will be in the same color space as specified by `space`.
`steps`	`None`	Minimum number of steps. If `None`, steps will be set to the number of input colors.
`max_steps`	`1000`	Maximum number of steps.
`max_delta_e`	`0`	Maximum delta E distance between the color stops. A value of `0` or less will be ignored.
`delta_e`	`None`	A string indicating which ∆E method to use. If nothing is supplied, the class object's current default ∆E method will be used.
`delta_e_args`	`None`	A dictionary containing keyword arguments to be passed to the `delta_e` method.
`domain`	`None`	A list of numbers defining the domain range of the interpolation.
`**interpolate_args`	See `interpolate`	Keyword arguments defined in `interpolate`.

Return

Returns a function that takes a range within the specified domain, the default being [0..1]. The function returns a new, interpolated Color object.

`Color.mix`

def mix(
    self,
    color: ColorInput,
    percent: float = util.DEF_MIX,
    *,
    in_place: bool = False,
    **interpolate_args: Any
) -> Color:
    ...

Description

Interpolates between two colors returning a color that represents the mixing of the base color and the provided color mixed at the provided percent, where percent applies to how much the provided color contributes to the the final result.

Parameters

Parameters	Defaults	Description
`color`		A color string, `Color` object, and/or dictionary representing a color.
`percent`	`0.5`	A numerical value between 0 - 1 representing the percentage at which the parameter `color` will be mixed.
`in_place`	`False`	Boolean used to determine if the the current color should be modified "in place" or a new `Color` object should be returned.
`**interpolate_args`	See `interpolate`	Keyword arguments defined in `interpolate`.

Return

Returns a reference to the new Color object or a reference to the current Color if in_place is True.

`Color.average`

@classmethod
def average(
    cls,
    colors: Iterable[ColorInput],
    *,
    space: str | None = None,
    out_space: str | None = None,
    premultiplied: bool = True,
    powerelss: bool | None = None
    **kwargs: Any
) -> Color:

Description

Get the average mean of all channels given a particular set of input colors.

Parameters

Parameters	Defaults	Description
`colors`		An iterable of color strings, `Color` objects, and/or dictionaries representing a color.
`space`	`None`	An optional string to specify what color space the colors should be averaged in. If none is provided, Oklab is assumed.
`out_space`	`None`	Color space that the new color should be in. If `None`, the return color will be in the same color space as specified via `space`.
`premultiplied`	`True`	Specify whether colors should be premultiplied during the averaging process.
`powerless`	`None`	Treat explicitly defined hues as powerless when the color is considered achromatic. If `None`, will use the class default which is `False` by default.

Return

Returns a reference to the new Color object representing the average of the input colors.

`Color.filter`

def filter(
    self,
    name: str,
    amount: float | None = None,
    *,
    space: str | None = None,
    in_place: bool = False,
    out_space: str | None = None,
    **kwargs: Any
) -> Color:
    ...

Description

Apply a color filter to alter a given color. The non-CVD filters are based on the W3C Filter Effects and behave in the same manner. Colors are evaluated in the sRGB Linear color space unless otherwise specified via the space parameter. No other color space will be accepted except sRGB and sRGB Linear.

An amount can be provided to adjust how much the color is filtered. Any clamping that occurs with the amount parameter, and related ways in which amount are applied, follow the W3C Filter Effects spec.

Some filters, such as CVDs, may take additional arguments via kwargs.

Filters	Name	Default
Brightness	`brightness`	`1`
Saturation	`saturate`	`1`
Contrast	`contrast`	`1`
Opacity	`opacity`	`1`
Invert	`invert`	`1`
Hue rotation	`hue-rotate`	`0`
Sepia	`sepia`	`1`
Grayscale	`grayscale`	`1`

CVD Filters	Name	Default
Protanopia CVD	`protan`	`1`
Deuteranopia CVD	`deutan`	`1`
Tritanopia CVD	`tritan`	`1`

Parameters

Parameters	Defaults	Description
`name`		The name of the filter that should be applied.
`amount`	See above	A numerical value adjusting to what degree the filter is applied. Input range can vary depending on the filter being used. Default can also dependent on the filter being used.
`space`	`None`	Controls the algorithm used for simulating the given CVD.
`in_place`	`False`	Boolean used to determine if the the current color should be modified "in place" or a new `Color` object should be returned.
`out_space`	`None`	Color space that the new color should be in. If `None`, the return color will be in the same color space as specified via `space`.
`**kwargs`		Additional filter specific parameters.

CVDs also take an optional method parameter that allows for specifying the CVD algorithm to use.

Simulation Approach	Name
Brettel 1997	`brettel`
Viénot, Brettel, and Mollon 1999	`vienot`
Machado 2009	`machado`

Return

Returns a reference to the new Color object or a reference to the current Color if in_place is True.

`Color.harmony`

def harmony(
    self,
    name: str,
    *,
    space: str | None = None,
    out_space: str | None = None,
    **kwargs: Any
) -> list[Color]:
    ...

Description

The harmony method uses the current color and returns a set of harmonious colors (including the current color). The color harmonies are based on the classical color harmonies of color theory. By default, harmonious colors are selected under the perceptually uniform OkLCh color space, but other cylindrical color spaces can be used.

Harmony	Name
Monochromatic	`mono`
Complementary	`complement`
Split Complement	`split`
Analogous	`analogous`
Triadic	`triad`
Tetradic Square	`square`
Tetradic Rectangle	`rectangle`
Wheel	`wheel`

Parameters

Parameters	Defaults	Description
`name`		Name of the color harmony to use.
`space`	`'oklch'`	Color space under which the harmonies will be calculated. Must be a cylindrical space.
`out_space`	`None`	Color space that the new color should be in. If `None`, the return color will be in the same color space as specified via `space`.
`**kwargs`		Any harmony specific parameters to pass to the called harmony.

Return

Returns a list of Color objects.

`Color.compose`

def compose(
    self,
    backdrop: ColorInput | Sequence[ColorInput],
    *,
    blend: str | bool = True,
    operator: str | bool = True,
    space: str | None = None,
    out_space: str | None = None,
    in_place: bool = False
) -> Color:
    ...

Description

Apply compositing which consists of a blend mode and a Porter Duff operator for alpha compositing. The current color is treated as the source (top layer) and the provided color as the backdrop (bottom layer). Colors will be composited in the srgb color space unless otherwise specified.

Colors should generally be RGB-ish colors (sRGB, Display P3, A98 RGB, etc.). The algorithm is designed only for RGB-ish colors. Non-RGB-ish colors are likely to provide nonsense results.

Supported blend modes are:

Blend Modes
`normal`	`multiply`	`darken`	`lighten`
`burn`	`dodge`	`screen`	`overlay`
`hard-light`	`exclusion`	`difference`	`soft-light`
`hue`	`saturation`	`luminosity`	`color`
`color`	`hue`	`saturation`	`luminosity`

Supported Port Duff operators are:

Operators
`clear`	`copy`	`destination`	`source-over`
`destination-over`	`source-in`	`destination-in`	`source-out`
`destination-out`	`source-atop`	`destination-atop`	`xor`
`lighter`

Parameters

Parameters	Defaults	Description
`backdrop`		A background color represented with either a string or `Color` object.
`blend`	`None`	A blend mode to use to use when compositing. Values should be a string specifying the name of the blend mode to use. If `None`, `normal` will be used. If `False`, blending will be skipped.
`operator`	`None`	A Porter Duff operator to use for alpha compositing. Values should be a string specifying the name of the operator to use. If `None`, `source-over` will be used. If `False`, alpha compositing will be skipped.
`space`	`None`	A color space to perform the overlay in. If `None`, the base color's space will be used.
`out_space`	`None`	Color space that the new color should be in. If `None`, the return color will be in the same color space as specified by `space`.
`in_place`	`False`	Boolean used to determine if the the current color should be modified "in place" or a new `Color` object should be returned.

Return

Returns a reference to the new Color object or a reference to the current Color if in_place is True.

`Color.clip`

def clip(
    self,
    space: str | None = None
) -> Color:

Description

Performs simple clipping on color channels that are out of gamut.

Parameters

Parameters	Defaults	Description
`space`	`None`	The color space that the color must be mapped to. If space is `None`, then the current color space will be used.

Return

Returns a reference to the current Color after fitting its coordinates to the specified gamut.

`Color.fit`

def fit(
    self,
    space: str | None = None,
    *,
    method: str | None = None,
    **kwargs: Any
) -> Color:
    ...

Description

Fits color to the current or specified color gamut.

By default, lch-chroma gamut mapping is used. This is essentially an approach that holds lightness and hue constant in the CIELCh color space while reducing chroma until the color is in gamut. Clipping is done at each step of the way and the color distance measured to see how close our color is to the intended color.

The supported gamut mapping methods are:

Name	Input
Clipping	`clip`
OkLCh Chroma	`oklch-chroma`
LCh Chroma	`lch-chroma`

Parameters

Some methods could have additional parameters to configure the behavior, these would be done through **kwargs. None of built-in gamut mapping methods currently have additional parameters.

Parameters	Defaults	Description
`space`	`None`	The color space that the color must be mapped to. If space is `None`, then the current color space will be used.
`method`	`None`	String that specifies which gamut mapping method to use. If `None`, `lch-chroma` will be used.

Return

Returns a reference to the current Color after fitting its coordinates to the specified gamut.

`Color.in_gamut`

def in_gamut(
    self, space: str | None = None,
    *,
    tolerance: float = util.DEF_FIT_TOLERANCE
) -> bool:

Description

Checks if the current color is in the current or specified gamut.

Parameters

Parameters	Defaults	Description
`space`	`None`	The color space that the color must be fit within. If space is `None`, then the current color space will be used.
`tolerance`	`0.000075`	Tolerance allowed when checking bounds of color.

Return

Returns a boolean indicating whether the color is in the specified gamut.

`Color.get`

def get(
    self,
    name: str | list[str] | tuple[str, ...],
    *,
    nans: bool = True
) -> float | list[float]:

Description

Retrieves the coordinate value from the specified channel or values from a sequence of specified channels. Channels must be a channel name in the current color space or a channel name in the specified color space using the syntax: space.channel.

Parameters

Parameters	Defaults	Description
`name`		Channel name or sequence of channel names. Channel names can define the color space and channel name to retrieve value from a different color space.
`nans`	`True`	Determines whether an undefined value is allowed to be returned. If disabled, undefined values will be resolved before returning.
Return

Returns a numerical value that is stored internally for the specified channel, or a calculated value in the case that a channel in a different color space is requested. If more than one value is requested, the a list of numerical values will be returned.

`Color.set`

def set(
    self,
    name: str | dict[str, float | Callable[..., float]],
    value: float | Callable[..., float] | None = None,
    *,
    nans: bool = True
) -> Color:

Description

Sets the given value to the specified channel. If the name is provided in the form space.channel, the value will be applied to the channel of the specified color space while keeping current color space the same.

The value can be a numerical value or a function that accepts a numerical channel value and returns a numerical channel value.

name can also be a dictionary of channels, each with a value. In this case, the value parameter of the function can be ignored.

This function returns the current colors reference so that multiple sets can be chained together.

Parameters

Parameters	Defaults	Description
`name`		A string containing a channel name or color space and channel separated by a `.` specifying the what channel to set. If `value` is omitted, `name` can also be a dictionary containing multiple channels, each specifying their own value to set.
`value`		A numerical value, a string value accepted by the specified color space, or a function.
`nans`	`True`	When doing relative sets via a callback input, ensure the channel value passed to the callback is a real number, not an undefined value.

Return

Returns a reference to the current Color object.

`Color.coords`

def coords(
    self,
    *,
    nans: bool = True
) -> Vector:
    ...

Description

Get the color channels (no alpha). If nans is set to False, all undefined values will be returned as defined.

Parameters

Parameters	Defaults	Description
`nans`	`True`	If `nans` is set to `False`, all undefined values will be returned as defined.

Return

Returns a list of float values, one for each color channel.

`Color.alpha`

def alpha(
    self,
    *,
    nans: bool = True
) -> float:
    ...

Description

Get the alpha channel's value. If nans is set to False, an undefined value will be returned as defined.

Parameters

Parameters	Defaults	Description
`nans`	`True`	If `nans` is set to `False`, an undefined value will be returned as defined.

Return

Returns a float.

`Color.is_achromatic`

def is_achromatic(
    self
) -> bool:
    ...

Description: Can be called on any color to determine if the color is achromatic. If a color is achromatic, or very close to achromatic, it will return True.
Return: Returns a boolean indicating whether the color is achromatic.

`Color.is_nan`

def is_nan(
    self,
    name: str
) -> bool:
    ...

Description

Retrieves the coordinate value from the specified channel and checks whether the value is undefined (set to NaN). Channel must be a channel name in the current color space or a channel name in the specified color space using the syntax: space.channel.

Parameters

Parameters	Defaults	Description
`name`		A string indicating what channel property to check.

Return

Returns a boolean indicating whether the specified color space's channel is NaN.

`Color.white`

def white(
    self
) -> Vector:
    ...

Description: Retrieves the white point for the current color's color space.
Return: Returns a set of XYZ coordinates that align with the white point for the given color space.

`Color.blackbody`

@classmethod
def blackbody(
    cls,
    temp: float,
    duv: float = 0.0,
    *,
    scale: bool = True,
    scale_space: str | None = None,
    out_space: str | None = None,
    method: str | None = None,
    **kwargs: Any
) -> Color:

Description

Creates a color from a temperature in Kelvin and an optional ∆_uv. The color will be scaled within the linear RGB space specified by scale_space and can be disabled by setting scale to False. By default, the Ohno 2013 algorithm is used and can be configured via method.

Parameters

Parameters	Defaults	Description
`temp`		A positive temperature in Kelvin. Accepted range of temperature is based on the algorithm.
`duv`	`0.0`	An optional ∆_uv specifying the distance from the black body curve.
`scale`	`True`	Scale the color with a linear RGB color space as defined by `scale_space`.
`scale_space`	`'srgb-linear'`	If `scale` is enabled, `scale_space` defines the RGB color space in which the returned color should be scaled within. The color space should be a linear space for best results. If undefined, `srgb-linear` will be used.
`out_space`	`None`	Color space that the new color should be in. If `None`, the return color will be in the same color space as specified by `space` or `xyz-d65` if `space` is `None`.
`method`	`None`	A string specifying the algorithm to use. By default `robertson-1968` is used.
`**kwargs`		Any plugin specific parameters to pass to the `blackbody` method.

Return

Returns a reference to the current Color.

`Color.cct`

def cct(
    self,
    *,
    method: str | None = None,
    **kwargs: Any
) -> Vector:

Description

Returns the associated CCT and ∆_uv for a given color. If the color is beyond an acceptable range for the algorithm or the color is very far from the locus, the result may be surprising.

Parameters

Parameters	Defaults	Description
`method`	`None`	A string specifying the algorithm to use. By default `robertson-1968` is used.
`**kwargs`		Any plugin specific parameters to pass to the `blackbody` method.

Return

Returns a list containing the correlated color temperature in Kelvin and the ∆_uv.

`Color.chromatic_adaptation`

@classmethod
def chromatic_adaptation(
    cls,
    w1: tuple[float, float],
    w2: tuple[float, float],
    xyz: VectorLike,
    *,
    method: str | None = None
) -> Vector:
    ...

Description

A class method that converts an XYZ set of coordinates between two given white points. The first white point must match the white point of the current coordinates and the second white point must be the desired white point to use. method dictates the method of chromatic adaptation to use.

Parameters

Parameters	Defaults	Description
`w1`		Current white point of the XYZ coordinates.
`w2`		Desired white point of the XYZ coordinates.
`xyz`		The XYZ coordinates to adapt.
`method`	`None`	The method of chromatic adaptation to use. If not specified, the current class's default method will be used.

Return

Returns a set of XYZ coordinates that have been chromatically adapted to the desired white point.

`Color.xy`

def xy(
    self,
    *,
    white: VectorLike | None = None
) -> Vector:

Description

Retrieves the CIE 1931 (x, y) chromaticity coordinates for a given color.

Parameters

Parameters	Defaults	Description
`white`	`None`	Specify the white in which to chromatically adapt the points from, if none is specified, the current color's white point is assumed.

Return

Returns a tuple of CIE 1931 (x, y) chromaticity points for the given color. The XYZ translation to xy will use the current color's white point to ensure the values are relative to the proper white point.

`Color.uv`

def uv(
    self,
    mode: str = '1976',
    *,
    white: VectorLike | None = None
) -> Vector:
    ...

Description

Retrieves the UCS 1960 (u, v) chromaticity coordinates for a given color or the CIE 1976 UCS (u', v') chromaticity coordinates, the latter being the default.

Parameters

Parameters	Defaults	Description
`mode`	`'1976'`	A string indicating what mode to use. `1976` refers to the (u', v') points as described by CIE 1976 UCS and `1960` describes the (u, v) points as documented by CIE 1960 UCS.
`white`	`None`	Specify the white in which to chromatically adapt the points from, if none is specified, the current color's white point is assumed.

Return

Returns a tuple of (u, v) – either 1976 (u', v') or 1960 (u, v) – chromaticity points for the given color. The XYZ translation to uv will use the current color's white point to ensure the values are relative to the proper white point.

`Color.get_chromaticity`

def get_chromaticity(
    self,
    cspace: str = 'uv-1976',
    *,
    white: VectorLike | None = None
) -> Vector:
    ...

Description

Retrieves the 1931 xy, 1960 uv, or 1976 u'v' chromaticity coordinates with the luminance (Y). Coordinates are returned in the format specified by cspace and will use the white point of the current color.

Parameters

Parameters	Defaults	Description
`cspace`	`'uv-1976'`	A string indicating what chromaticity space to use. `uv-1976` being the default.
`white`	`None`	Specify the white in which to chromatically adapt the points from, if none is specified, the current color's white point is assumed.

Return

Returns a list of chromaticity coordinates. Results will either be in [x, y, Y] for 1931 xy, [u, v, Y] for 1960 uv, or [u', v', Y] for 1976 u'v'.

`Color.chromaticity`

@classmethod
def chromaticity(
    cls,
    space: str,
    coords: VectorLike,
    cspace: str = 'uv-1976',
    *,
    scale: bool = False,
    scale_space: str | None = None,
    white: VectorLike | None = None
) -> Color:
    ...

Description

Returns a color that satisfies the provided chromaticity coordinates. Coordinates can be in the form 1931 xyY, 1960 uvY, or 1976 u'v'Y and can be configured via cspace. The target space to convert to should be specified via space. Chromaticity coordinates should math the white space of the targeted space, but if they are not the white point of the chromaticity coordinates can be specified with white.

Parameters

Parameters	Defaults	Description
`space`		Color space to chromaticities to.
`coords`		The chromaticity coordinates. Values can be in either 3D form (with luminance Y).
`cspace`	`'uv-1976'`	A string indicating what chromaticity space to use. `uv-1976` being the default.
`white`	`None`	Specify the white in which to chromatically adapt the points from, if none is specified, the targeted color's white point is assumed.
`scale`	`True`	Scale the color with a linear RGB color space as defined by `scale_space`.
`scale_space`	`None`	If `scale` is enabled, `scale_space` defines the RGB color space in which the returned color should be scaled within. The color space should be a linear space for best results. If undefined, `srgb-linear` will be used.

Return

Returns a reference to a new Color object that satisfies the chromaticity coordinates.

`Color.convert_chromaticity`

@classmethod
def convert_chromaticity(
    cls,
    cspace1: str,
    cspace2: str,
    coords: VectorLike
) -> Vector:
    ...

Description

Converts a 2D chromaticity pair from one chromaticity space to another. Supported spaces are xy-1931, uv-1960, and uv-1976.

Parameters

Parameters	Defaults	Description
`cspace1`		Initial chromaticity space for the given coordinates.
`cspace2`		Target chromaticity space for the given coordinates.
`coords`		The 2D chromaticity coordinates to convert.

Return

Returns the converted 2D chromaticity coordinates.