# Struct deltae::DeltaE

``pub struct DeltaE { /* private fields */ }``
Expand description

### The measured difference between two colors

There are many different methods of calculating color difference. Different methods have a specific purpose, mainly in determining the level of tolerance for describing the difference between two colors. Regardless of the `DEMethod` used, `DeltaE` is always calculated based on the `LabValue`s of the two colors.

## Implementations§

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### impl DeltaE

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#### pub fn new<A, B>(a: A, b: B, method: DEMethod) -> DeltaEwhere A: Delta, B: Delta,

New `DeltaE` from two colors and a `DEMethod`.

``````use deltae::{LabValue, DeltaE, DEMethod::DE2000};

let lab0 = LabValue::new(89.73, 1.88, -6.96).unwrap();
let lab1 = LabValue::new(95.08, -0.17, -10.81).unwrap();
let de0 = DeltaE::new(&lab0, &lab1, DE2000);
assert_eq!(de0, 5.316941);``````
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#### pub fn with_method(self, method: DEMethod) -> Self

Recalculate `DeltaE` with another `DEMethod`

``````use deltae::{Delta, DeltaE, LabValue, DEMethod};

let lab0 = LabValue::new(89.73, 1.88, -6.96).unwrap();
let lab1 = LabValue::new(95.08, -0.17, -10.81).unwrap();
let de2000 = lab0.delta(lab1, DEMethod::DE2000);
let de1976 = de2000.with_method(DEMethod::DE1976);
assert_eq!(de1976, 6.902716);``````
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#### pub fn method(&self) -> &DEMethod

Return a reference to the `DeltaE` method used in the calculation

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#### pub fn value(&self) -> &f32

Return a reference to the `DeltaE` value

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#### pub fn reference(&self) -> &LabValue

Return a reference to the reference `LabValue` used in the calculation. A reference color is the base color to which the sample color is being compared.

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#### pub fn sample(&self) -> &LabValue

Return a reference to the sample `LabValue` used in the calculation. A sample color is the color being compared to the reference color.

## Trait Implementations§

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### impl Clone for DeltaE

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#### fn clone(&self) -> DeltaE

Returns a copy of the value. Read more
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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl Debug for DeltaE

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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### impl Display for DeltaE

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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### impl PartialEq<DeltaE> for DeltaE

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#### fn eq(&self, other: &Self) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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### impl PartialEq<f32> for DeltaE

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#### fn eq(&self, f: &f32) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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### impl PartialOrd<DeltaE> for DeltaE

One should be careful when ordering DeltaE. A `DE2000:1.0` value is not necessarily the same amount of color difference as a amount of color difference `DE1976:1.0` value.

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#### fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between `self` and `other` values if one exists. Read more
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#### fn lt(&self, other: &Rhs) -> bool

This method tests less than (for `self` and `other`) and is used by the `<` operator. Read more
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#### fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for `self` and `other`) and is used by the `<=` operator. Read more
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#### fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for `self` and `other`) and is used by the `>` operator. Read more
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#### fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for `self` and `other`) and is used by the `>=` operator. Read more
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### impl Round for DeltaE

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#### fn round_to(self, places: i32) -> Self

Rounds the value to a number of decimal places
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### impl Tolerance for DeltaE

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#### fn tolerance(self) -> f32

Return a tolerance value
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## Blanket Implementations§

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### impl<T> Any for Twhere T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for Twhere T: ?Sized,

const: unstable · source§

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for Twhere T: ?Sized,

const: unstable · source§

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> From<T> for T

const: unstable · source§

#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for Twhere U: From<T>,

const: unstable · source§

#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> ToOwned for Twhere T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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### impl<T> ToString for Twhere T: Display + ?Sized,

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#### default fn to_string(&self) -> String

Converts the given value to a `String`. Read more
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### impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
const: unstable · source§

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.