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use crate::{
angle::RealAngle,
bool_mask::{HasBoolMask, LazySelect},
hues::Cam16Hue,
num::{Abs, Arithmetics, FromScalar, PartialCmp, Powf, Real, Signum, Sqrt, Trigonometry, Zero},
Alpha, GetHue, Xyz,
};
use super::{
BakedParameters, Cam16FromUnclamped, Cam16IntoUnclamped, Cam16Jch, Cam16Jmh, Cam16Jsh,
Cam16Qch, Cam16Qmh, Cam16Qsh, FromCam16Unclamped, IntoCam16Unclamped, WhitePointParameter,
};
/// CIE CAM16 with an alpha component.
///
/// See the [`Cam16a` implementation in `Alpha`](crate::Alpha#Cam16a).
pub type Cam16a<T> = Alpha<Cam16<T>, T>;
/// The CIE CAM16 color appearance model.
///
/// It's a set of six technically defined attributes that describe the
/// appearance of a color under certain viewing conditions, and it's a successor
/// of [CIECAM02](https://en.wikipedia.org/wiki/CIECAM02). The viewing
/// conditions are defined using [`Parameters`][super::Parameters], and two sets
/// of parameters can be used to translate the appearance of a color from one
/// set of viewing conditions to another.
///
/// The use of the viewing conditions parameters sets `Cam16` and its derived
/// types apart from most other color types in this library. It's, for example,
/// not possible to use [`FromColor`][crate::FromColor] and friends to convert
/// to and from other types, since that would require default viewing conditions
/// to exist. Instead, the explicit [`Cam16::from_xyz`] and [`Cam16::into_xyz`]
/// are there to bridge the gap.
///
/// Not all attributes are used when converting _from_ CAM16, since they are
/// correlated and derived from each other. This library also provides partial
/// versions of this struct, to make it easier to correctly specify a minimum
/// attribute set.
///
/// The full list of partial CAM16 variants is:
///
/// * [`Cam16Jch`](crate::cam16::Cam16Jch): lightness and chroma.
/// * [`Cam16Jmh`](crate::cam16::Cam16Jmh): lightness and colorfulness.
/// * [`Cam16Jsh`](crate::cam16::Cam16Jsh): lightness and saturation.
/// * [`Cam16Qch`](crate::cam16::Cam16Qch): brightness and chroma.
/// * [`Cam16Qmh`](crate::cam16::Cam16Qmh): brightness and colorfulness.
/// * [`Cam16Qsh`](crate::cam16::Cam16Qsh): brightness and saturation.
///
/// # CAM16-UCS
///
/// While CIE CAM16 is a model of color appearance, it's not necessarily
/// suitable as a color space. Instead, there is the CAM16-UCS (CAM16 uniform
/// color space), that's based off of the lightness, colorfulness and hue
/// attributes. This colorspace is represented by the
/// [`Cam16UcsJmh`][crate::cam16::Cam16UcsJmh] and
/// [`Cam16UcsJab`][crate::cam16::Cam16UcsJab] types.
///
/// # Creating a Value
///
/// A `Cam16` value would typically come from another color space, or one of the
/// partial sets of CAM16 attributes. All of which require known viewing
/// conditions.
///
/// ```
/// use palette::{
/// Srgb, FromColor, IntoColor,
/// cam16::{Cam16, Parameters, Cam16Jmh, Cam16UcsJmh},
/// };
///
/// // Customize these according to the viewing conditions:
/// let mut example_parameters = Parameters::default_static_wp(40.0);
///
/// // CAM16 from sRGB, or most other color spaces:
/// let rgb = Srgb::new(0.3f32, 0.8, 0.1);
/// let cam16_from_rgb = Cam16::from_xyz(rgb.into_color(), example_parameters);
///
/// // Full CAM16 from a partial set (any partial set can be used):
/// let partial = Cam16Jmh::new(50.0f32, 80.0, 120.0);
/// let cam16_from_partial = partial.into_full(example_parameters);
///
/// // Full CAM16 from CAM16-UCS J'M'h':
/// let ucs = Cam16UcsJmh::new(50.0f32, 80.0, 120.0);
/// let cam16_from_ucs = Cam16Jmh::from_color(ucs).into_full(example_parameters);
/// ```
#[derive(Clone, Copy, Debug, WithAlpha, Default)]
#[palette(palette_internal, component = "T")]
#[repr(C)]
pub struct Cam16<T> {
/// The [lightness](https://cie.co.at/eilvterm/17-22-063) (J) of the
/// color.
///
/// It's a perception of the color's luminance, but not linear to it, and is
/// relative to the reference white. The lightness of black is `0.0` and the
/// lightness of white is `100.0`.
///
/// Lightness behaves similarly to L\* in [`Lch`][crate::Lch] or lightness
/// in [`Hsl`][crate::Hsl].
///
/// See also <https://en.wikipedia.org/wiki/Lightness>.
#[doc(alias = "J")]
pub lightness: T,
/// The [chroma](https://cie.co.at/eilvterm/17-22-074) (C) of
/// the color.
///
/// It's how chromatic the color appears in comparison with a grey color of
/// the same lightness. Changing the perceived chroma doesn't change the
/// perceived lightness, and vice versa.
///
/// Chroma behaves similarly to chroma in [`Lch`][crate::Lch] or saturation
/// in [`Hsl`][crate::Hsl].
///
/// See also <https://en.wikipedia.org/wiki/Colorfulness#Chroma>.
#[doc(alias = "C")]
pub chroma: T,
/// The [hue](https://cie.co.at/eilvterm/17-22-067) (h) of the color.
///
/// The color's position around a color circle, in degrees.
///
/// See also <https://en.wikipedia.org/wiki/Hue>.
#[doc(alias = "h")]
pub hue: Cam16Hue<T>,
/// The [brightness](https://cie.co.at/eilvterm/17-22-059) (Q) of the
/// color.
///
/// It's the perception of how much light appears to shine from an object.
/// As opposed to `lightness`, this is not in comparison to a reference
/// white, but in more absolute terms. Lightness and brightness area also
/// not linearly correlated in CAM16.
///
/// Brightness behaves similarly to value in [`Hsv`][crate::Hsv].
///
/// See also <https://en.wikipedia.org/wiki/Brightness>.
#[doc(alias = "Q")]
pub brightness: T,
/// The [colorfulness](https://cie.co.at/eilvterm/17-22-072) (M) of the
/// color.
///
/// It's a perception of how chromatic the color is and usually increases
/// with luminance, unless the brightness is very high.
///
/// See also <https://en.wikipedia.org/wiki/Colorfulness>.
#[doc(alias = "M")]
pub colorfulness: T,
/// The [saturation](https://cie.co.at/eilvterm/17-22-073)
/// (s) of the color.
///
/// It's the colorfulness of a color in proportion to its own brightness.
/// The perceived saturation should stay the same when the perceived
/// brightness changes, and vice versa.
///
/// Saturation behaves similarly to saturation in [`Hsv`][crate::Hsv].
///
/// See also <https://en.wikipedia.org/wiki/Colorfulness#Saturation>.
#[doc(alias = "s")]
pub saturation: T,
}
impl<T> Cam16<T> {
/// Derive CIE CAM16 attributes for the provided color, under the provided
/// viewing conditions.
///
/// ```
/// use palette::{Srgb, IntoColor, cam16::{Cam16, Parameters}};
///
/// // Customize these according to the viewing conditions:
/// let mut example_parameters = Parameters::default_static_wp(40.0);
///
/// let rgb = Srgb::new(0.3f32, 0.8, 0.1);
/// let cam16 = Cam16::from_xyz(rgb.into_color(), example_parameters);
/// ```
///
/// It's also possible to "pre-bake" the parameters, to avoid recalculate
/// some of the derived values when converting multiple color value.
///
/// ```
/// use palette::{Srgb, IntoColor, cam16::{Cam16, Parameters}};
///
/// // Customize these according to the viewing conditions:
/// let mut example_parameters = Parameters::default_static_wp(40.0);
///
/// let baked_parameters = example_parameters.bake();
///
/// let rgb = Srgb::new(0.3f32, 0.8, 0.1);
/// let cam16 = Cam16::from_xyz(rgb.into_color(), baked_parameters);
/// ```
#[inline]
pub fn from_xyz<WpParam>(
color: Xyz<WpParam::StaticWp, T>,
parameters: impl Into<BakedParameters<WpParam, T::Scalar>>,
) -> Self
where
Xyz<WpParam::StaticWp, T>: IntoCam16Unclamped<WpParam, Self, Scalar = T::Scalar>,
T: FromScalar,
WpParam: WhitePointParameter<T::Scalar>,
{
color.into_cam16_unclamped(parameters.into())
}
/// Construct an XYZ color that matches these CIE CAM16 attributes, under
/// the provided viewing conditions.
///
/// <p class="warning">
/// This assumes that all of the correlated attributes are consistent, as
/// only some of them are actually used. You may want to use one of the
/// partial CAM16 representations for more control over which set of
/// attributes that should be.
/// </p>
///
/// ```
/// use palette::{Srgb, FromColor, cam16::{Cam16, Parameters}};
/// # fn get_cam16_value() -> Cam16<f32> {Cam16::default()}
///
/// // Customize these according to the viewing conditions:
/// let mut example_parameters = Parameters::default_static_wp(40.0);
///
/// let cam16: Cam16<f32> = get_cam16_value();
/// let rgb = Srgb::from_color(cam16.into_xyz(example_parameters));
/// ```
///
/// It's also possible to "pre-bake" the parameters, to avoid recalculate
/// some of the derived values when converting multiple color value.
///
/// ```
/// use palette::{Srgb, FromColor, cam16::{Cam16, Parameters}};
/// # fn get_cam16_value() -> Cam16<f32> {Cam16::default()}
///
/// // Customize these according to the viewing conditions:
/// let mut example_parameters = Parameters::default_static_wp(40.0);
///
/// let baked_parameters = example_parameters.bake();
///
/// let cam16: Cam16<f32> = get_cam16_value();
/// let rgb = Srgb::from_color(cam16.into_xyz(baked_parameters));
/// ```
#[inline]
pub fn into_xyz<WpParam>(
self,
parameters: impl Into<BakedParameters<WpParam, T::Scalar>>,
) -> Xyz<WpParam::StaticWp, T>
where
Self: Cam16IntoUnclamped<WpParam, Xyz<WpParam::StaticWp, T>, Scalar = T::Scalar>,
WpParam: WhitePointParameter<T>,
T: FromScalar,
{
self.cam16_into_unclamped(parameters.into())
}
}
///<span id="Cam16a"></span>[`Cam16a`](crate::cam16::Cam16a) implementations.
impl<T, A> Alpha<Cam16<T>, A> {
/// Derive CIE CAM16 attributes with transparency for the provided color,
/// under the provided viewing conditions.
///
/// ```
/// use palette::{Srgba, IntoColor, cam16::{Cam16a, Parameters}};
///
/// // Customize these according to the viewing conditions:
/// let mut example_parameters = Parameters::default_static_wp(40.0);
///
/// let rgba = Srgba::new(0.3f32, 0.8, 0.1, 0.9);
/// let cam16a = Cam16a::from_xyz(rgba.into_color(), example_parameters);
/// ```
///
/// It's also possible to "pre-bake" the parameters, to avoid recalculate
/// some of the derived values when converting multiple color value.
///
/// ```
/// use palette::{Srgba, IntoColor, cam16::{Cam16a, Parameters}};
///
/// // Customize these according to the viewing conditions:
/// let mut example_parameters = Parameters::default_static_wp(40.0);
///
/// let baked_parameters = example_parameters.bake();
///
/// let rgba = Srgba::new(0.3f32, 0.8, 0.1, 0.9);
/// let cam16a = Cam16a::from_xyz(rgba.into_color(), baked_parameters);
/// ```
#[inline]
pub fn from_xyz<WpParam>(
color: Alpha<Xyz<WpParam::StaticWp, T>, A>,
parameters: impl Into<BakedParameters<WpParam, T::Scalar>>,
) -> Self
where
Xyz<WpParam::StaticWp, T>: IntoCam16Unclamped<WpParam, Cam16<T>, Scalar = T::Scalar>,
T: FromScalar,
WpParam: WhitePointParameter<T::Scalar>,
{
let Alpha { color, alpha } = color;
Alpha {
color: Cam16::from_xyz(color, parameters),
alpha,
}
}
/// Construct an XYZ color with transparency, that matches these CIE CAM16
/// attributes, under the provided viewing conditions.
///
/// <p class="warning">
/// This assumes that all of the correlated attributes are consistent, as
/// only some of them are actually used. You may want to use one of the
/// partial CAM16 representations for more control over which set of
/// attributes that should be.
/// </p>
///
/// ```
/// use palette::{Srgba, FromColor, cam16::{Cam16a, Parameters}};
/// # fn get_cam16a_value() -> Cam16a<f32> {Cam16a::default()}
///
/// // Customize these according to the viewing conditions:
/// let mut example_parameters = Parameters::default_static_wp(40.0);
///
/// let cam16a = get_cam16a_value();
/// let rgba = Srgba::from_color(cam16a.into_xyz(example_parameters));
/// ```
///
/// It's also possible to "pre-bake" the parameters, to avoid recalculate
/// some of the derived values when converting multiple color value.
///
/// ```
/// use palette::{Srgba, FromColor, cam16::{Cam16a, Parameters}};
/// # fn get_cam16a_value() -> Cam16a<f32> {Cam16a::default()}
///
/// // Customize these according to the viewing conditions:
/// let mut example_parameters = Parameters::default_static_wp(40.0);
///
/// let baked_parameters = example_parameters.bake();
///
/// let cam16a = get_cam16a_value();
/// let rgba = Srgba::from_color(cam16a.into_xyz(baked_parameters));
/// ```
#[inline]
pub fn into_xyz<WpParam>(
self,
parameters: impl Into<BakedParameters<WpParam, T::Scalar>>,
) -> Alpha<Xyz<WpParam::StaticWp, T>, A>
where
Cam16<T>: Cam16IntoUnclamped<WpParam, Xyz<WpParam::StaticWp, T>, Scalar = T::Scalar>,
WpParam: WhitePointParameter<T>,
T: FromScalar,
{
let Alpha { color, alpha } = self;
Alpha {
color: color.into_xyz(parameters),
alpha,
}
}
}
impl<WpParam, T> Cam16FromUnclamped<WpParam, Xyz<WpParam::StaticWp, T>> for Cam16<T>
where
WpParam: WhitePointParameter<T::Scalar>,
T: Real
+ FromScalar
+ Arithmetics
+ Powf
+ Sqrt
+ Abs
+ Signum
+ Trigonometry
+ RealAngle
+ Clone,
T::Scalar: Clone,
{
type Scalar = T::Scalar;
fn cam16_from_unclamped(
color: Xyz<WpParam::StaticWp, T>,
parameters: BakedParameters<WpParam, Self::Scalar>,
) -> Self {
super::math::xyz_to_cam16(color.with_white_point(), parameters.inner)
}
}
macro_rules! impl_from_cam16_partial {
($($name: ident),+) => {
$(
impl<WpParam, T> Cam16FromUnclamped<WpParam, $name<T>> for Cam16<T>
where
WpParam: WhitePointParameter<T>,
T: Real + FromScalar + Zero + Arithmetics + Sqrt + PartialCmp + Clone,
T::Mask: LazySelect<T> + Clone,
T::Scalar: Clone
{
type Scalar = T::Scalar;
fn cam16_from_unclamped(
cam16: $name<T>,
parameters: crate::cam16::BakedParameters<WpParam, Self::Scalar>,
) -> Self {
let (
luminance,
chromaticity,
hue,
) = cam16.into_dynamic();
let (lightness, brightness) = luminance.into_cam16(parameters.clone());
let (chroma, colorfulness, saturation) =
chromaticity.into_cam16(lightness.clone(), parameters);
Cam16 {
lightness,
chroma,
hue,
brightness,
colorfulness,
saturation,
}
}
}
impl<WpParam, T> FromCam16Unclamped<WpParam, $name<T>> for Cam16<T>
where
Self: Cam16FromUnclamped<WpParam, $name<T>>,
{
type Scalar = <Self as Cam16FromUnclamped<WpParam, $name<T>>>::Scalar;
fn from_cam16_unclamped(
cam16: $name<T>,
parameters: crate::cam16::BakedParameters<WpParam, Self::Scalar>,
) -> Self {
Self::cam16_from_unclamped(cam16, parameters)
}
}
)+
};
}
impl_from_cam16_partial!(Cam16Jmh, Cam16Jch, Cam16Jsh, Cam16Qmh, Cam16Qch, Cam16Qsh);
impl<T> GetHue for Cam16<T>
where
T: Clone,
{
type Hue = Cam16Hue<T>;
fn get_hue(&self) -> Cam16Hue<T> {
self.hue.clone()
}
}
impl<T> HasBoolMask for Cam16<T>
where
T: HasBoolMask,
{
type Mask = T::Mask;
}
// Macro implementations
impl_is_within_bounds! {
Cam16 {
lightness => [T::zero(), None],
chroma => [T::zero(), None],
brightness => [T::zero(), None],
colorfulness => [T::zero(), None],
saturation => [T::zero(), None]
}
where T: Zero
}
impl_clamp! {
Cam16 {
lightness => [T::zero()],
chroma => [T::zero()],
brightness => [T::zero()],
colorfulness => [T::zero()],
saturation => [T::zero()]
}
other {hue}
where T: Zero
}
impl_eq_hue!(
Cam16,
Cam16Hue,
[lightness, chroma, brightness, colorfulness, saturation]
);
impl_simd_array_conversion_hue!(
Cam16,
[lightness, chroma, brightness, colorfulness, saturation]
);
// Unit test
#[cfg(test)]
#[cfg(feature = "approx")]
mod test {
use crate::{
cam16::{
math::{chromaticity::ChromaticityType, luminance::LuminanceType},
BakedParameters, Cam16Jch, Parameters,
},
convert::{FromColorUnclamped, IntoColorUnclamped},
Srgb,
};
use super::Cam16;
macro_rules! assert_cam16_to_rgb {
($cam16:expr, $rgb:expr, $($params:tt)*) => {
let cam16 = $cam16;
let parameters = BakedParameters::from(Parameters::TEST_DEFAULTS);
let rgb: Srgb<f64> = cam16.into_xyz(parameters).into_color_unclamped();
assert_relative_eq!(rgb, $rgb, $($params)*);
let chromaticities = [
ChromaticityType::Chroma(cam16.chroma),
ChromaticityType::Colorfulness(cam16.colorfulness),
ChromaticityType::Saturation(cam16.saturation),
];
let luminances = [
LuminanceType::Lightness(cam16.lightness),
LuminanceType::Brightness(cam16.brightness),
];
for luminance in luminances {
for chromaticity in chromaticities {
let partial = (
luminance,
chromaticity,
cam16.hue,
);
let xyz = crate::cam16::math::cam16_to_xyz(partial, parameters.inner).with_white_point();
assert_relative_eq!(
Srgb::<f64>::from_color_unclamped(xyz),
$rgb,
$($params)*
);
}
}
};
}
#[test]
fn converts_with_jch() {
let parameters = Parameters::TEST_DEFAULTS.bake();
let xyz = Srgb::from(0x5588cc).into_linear().into_color_unclamped();
let mut cam16: Cam16<f64> = Cam16::from_xyz(xyz, parameters);
let cam16jch = Cam16Jch::from_full(cam16);
// Zero the other attributes so they produce errors if they are used.
cam16.brightness = 0.0;
cam16.colorfulness = 0.0;
cam16.saturation = 0.0;
assert_eq!(cam16.into_xyz(parameters), cam16jch.into_xyz(parameters));
}
#[test]
fn example_blue() {
// Uses the example color from https://observablehq.com/@jrus/cam16
let xyz = Srgb::from(0x5588cc).into_linear().into_color_unclamped();
let mut cam16: Cam16<f64> = Cam16::from_xyz(xyz, Parameters::TEST_DEFAULTS);
cam16.hue = cam16.hue.into_positive_degrees().into();
assert_relative_eq!(
cam16,
Cam16 {
lightness: 45.544264720360346,
chroma: 45.07001048293764,
hue: 259.225345298129.into(),
brightness: 132.96974182692045,
colorfulness: 39.4130607870103,
saturation: 54.4432031413259,
},
epsilon = 0.01
);
assert_cam16_to_rgb!(
cam16,
Srgb::from(0x5588cc).into_format(),
epsilon = 0.0000001
);
}
#[test]
fn black() {
// Checks against the output from https://observablehq.com/@jrus/cam16
let xyz = Srgb::from(0x000000).into_linear().into_color_unclamped();
let mut cam16: Cam16<f64> = Cam16::from_xyz(xyz, Parameters::TEST_DEFAULTS);
cam16.hue = cam16.hue.into_positive_degrees().into();
assert_relative_eq!(
cam16,
Cam16 {
lightness: 0.0,
chroma: 0.0,
hue: 0.0.into(),
brightness: 0.0,
colorfulness: 0.0,
saturation: 0.0,
},
epsilon = 0.01
);
assert_cam16_to_rgb!(
cam16,
Srgb::from(0x000000).into_format(),
epsilon = 0.0000001
);
}
#[test]
fn white() {
// Checks against the output from https://observablehq.com/@jrus/cam16
let xyz = Srgb::from(0xffffff).into_linear().into_color_unclamped();
let mut cam16: Cam16<f64> = Cam16::from_xyz(xyz, Parameters::TEST_DEFAULTS);
cam16.hue = cam16.hue.into_positive_degrees().into();
assert_relative_eq!(
cam16,
Cam16 {
lightness: 99.99955537650459,
chroma: 2.1815254387079435,
hue: 209.49854407518228.into(),
brightness: 197.03120459014184,
colorfulness: 1.9077118865271965,
saturation: 9.839859256901553,
},
epsilon = 0.1
);
assert_cam16_to_rgb!(
cam16,
Srgb::from(0xffffff).into_format(),
epsilon = 0.0000001
);
}
#[test]
fn red() {
// Checks against the output from https://observablehq.com/@jrus/cam16
let xyz = Srgb::from(0xff0000).into_linear().into_color_unclamped();
let mut cam16: Cam16<f64> = Cam16::from_xyz(xyz, Parameters::TEST_DEFAULTS);
cam16.hue = cam16.hue.into_positive_degrees().into();
assert_relative_eq!(
cam16,
Cam16 {
lightness: 46.23623443823762,
chroma: 113.27879472174797,
hue: 27.412485587695937.into(),
brightness: 133.9760614641257,
colorfulness: 99.06063864657237,
saturation: 85.98782392745971,
},
epsilon = 0.01
);
assert_cam16_to_rgb!(cam16, Srgb::from(0xff0000).into_format(), epsilon = 0.00001);
}
#[test]
fn green() {
// Checks against the output from https://observablehq.com/@jrus/cam16
let xyz = Srgb::from(0x00ff00).into_linear().into_color_unclamped();
let mut cam16: Cam16<f64> = Cam16::from_xyz(xyz, Parameters::TEST_DEFAULTS);
cam16.hue = cam16.hue.into_positive_degrees().into();
assert_relative_eq!(
cam16,
Cam16 {
lightness: 79.23121430933533,
chroma: 107.77869525794452,
hue: 141.93451307926003.into(),
brightness: 175.38164288466993,
colorfulness: 94.25088262080988,
saturation: 73.30787758114869,
},
epsilon = 0.01
);
assert_cam16_to_rgb!(
cam16,
Srgb::from(0x00ff00).into_format(),
epsilon = 0.000001
);
}
#[test]
fn blue() {
// Checks against the output from https://observablehq.com/@jrus/cam16
let xyz = Srgb::from(0x0000ff).into_linear().into_color_unclamped();
let mut cam16: Cam16<f64> = Cam16::from_xyz(xyz, Parameters::TEST_DEFAULTS);
cam16.hue = cam16.hue.into_positive_degrees().into();
assert_relative_eq!(
cam16,
Cam16 {
lightness: 25.22701796474445,
chroma: 86.59618504567312,
hue: 282.81848901862566.into(),
brightness: 98.96210767195342,
colorfulness: 75.72708922311855,
saturation: 87.47645277637828,
},
epsilon = 0.01
);
assert_cam16_to_rgb!(
cam16,
Srgb::from(0x0000ff).into_format(),
epsilon = 0.000001
);
}
#[cfg(feature = "wide")]
#[test]
fn simd() {
let white_srgb = Srgb::from(0xffffff).into_format();
let white_cam16 = Cam16 {
lightness: 99.99955537650459,
chroma: 2.1815254387079435,
hue: 209.49854407518228.into(),
brightness: 197.03120459014184,
colorfulness: 1.9077118865271965,
saturation: 9.839859256901553,
};
let red_srgb = Srgb::from(0xff0000).into_format();
let red_cam16 = Cam16 {
lightness: 46.23623443823762,
chroma: 113.27879472174797,
hue: 27.412485587695937.into(),
brightness: 133.9760614641257,
colorfulness: 99.06063864657237,
saturation: 85.98782392745971,
};
let green_srgb = Srgb::from(0x00ff00).into_format();
let green_cam16 = Cam16 {
lightness: 79.23121430933533,
chroma: 107.77869525794452,
hue: 141.93451307926003.into(),
brightness: 175.38164288466993,
colorfulness: 94.25088262080988,
saturation: 73.30787758114869,
};
let blue_srgb = Srgb::from(0x0000ff).into_format();
let blue_cam16 = Cam16 {
lightness: 25.22701796474445,
chroma: 86.59618504567312,
hue: 282.81848901862566.into(),
brightness: 98.96210767195342,
colorfulness: 75.72708922311855,
saturation: 87.47645277637828,
};
let srgb = Srgb::<wide::f64x4>::from([white_srgb, red_srgb, green_srgb, blue_srgb]);
let xyz = srgb.into_linear().into_color_unclamped();
let mut cam16 = Cam16::from_xyz(xyz, Parameters::TEST_DEFAULTS);
cam16.hue = cam16.hue.into_positive_degrees().into();
assert_relative_eq!(
&<[Cam16<_>; 4]>::from(cam16)[..],
&[white_cam16, red_cam16, green_cam16, blue_cam16][..],
epsilon = 0.1
);
let srgb = Srgb::from_color_unclamped(cam16.into_xyz(Parameters::TEST_DEFAULTS));
assert_relative_eq!(
&<[Srgb<_>; 4]>::from(srgb)[..],
&[white_srgb, red_srgb, green_srgb, blue_srgb][..],
epsilon = 0.00001
);
}
}