Enum image_canvas::color::ColorChannel

#[non_exhaustive]
pub enum ColorChannel {
    R,
    G,
    B,
    Luma,
    Alpha,
    Cb,
    Cr,
    L,
    LABa,
    LABb,
    C,
    LABh,
    X,
    Y,
    Z,
    Scalar0,
    Scalar1,
    Scalar2,
}

Describes a single channel from an image.

This can be thought of as an index into a vector of channels relating to a color. Combine with a concrete ColorChannelModel for the canonical index in a 4-sample color representation.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

R

The weight of the red primary.

G

The weight of the green primary.

B

The weight of the blue primary.

Luma

A luminescence. Note that YCbCr will be composed of Luma and Cb, Cr. This avoids the gnarly overlap between it and Y as the standard observer (even though this Y is often used to define the Luma relative to standard illuminant).

Alpha

An alpha/translucence component.

Cb

Blue-channel difference.

Cr

Red-channel difference.

L

Lightness. Not to be confused with luminescence as this is perceptual.

LABa

The component a (green/red) of a LAB color.

LABb

The component b (green/red) of a LAB color.

C

Chroma of a LAB color, polar distance, hypot(a, b).

LABh

Hue of a LAB based color, polar angle, `atan2(b, a).

X

The first CIE standard observer.

Y

The second CIE standard observer.

Z

The second CIE standard observer.

Scalar0

Scalar1

Scalar2

Implementations

impl ColorChannel

pub fn in_model(self, model: ColorChannelModel) -> bool

The color model of the channel.

Returns None if it does not belong to any singular color model.

Trait Implementations

impl Clone for ColorChannel

fn clone(&self) -> ColorChannel

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ColorChannel

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

Formats the value using the given formatter.

impl PartialEq<ColorChannel> for ColorChannel

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

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl Copy for ColorChannel

impl Eq for ColorChannel

impl StructuralEq for ColorChannel

impl StructuralPartialEq for ColorChannel