Gamut class

Defines the gamut-specific constants that the HCT solver needs.

A gamut is defined by:

• Its RGB-to-XYZ matrix (determined by the RGB primaries and white point)
• Its transfer function (EOTF/OETF, i.e. "gamma")

The solver uses precomputed composite matrices that bake together the RGB-to-XYZ conversion with CAM16's chromatic adaptation, plus a lookup table of "critical planes" derived from the transfer function.

Three standard gamuts are provided: srgb, displayP3, and rec2020.

Constructors

Gamut({required String name, required List<double> yFromLinrgb, required List<List<double>> scaledDiscountFromLinrgb, required List<List<double>> linrgbFromScaledDiscount, required List<List<double>> rgbToXyz, required List<List<double>> xyzToRgb, required double trueDelinearize(double), required double linearize(double), required List<double> criticalPlanes})

const

Gamut.fromPrimaries({required String name, required List<List<double>> rgbToXyz, required double trueDelinearize(double), required double linearize(double)})

Creates a Gamut from an RGB-to-XYZ matrix and transfer functions.

factory

Properties

criticalPlanes → List<double>

Precomputed critical planes for the transfer function.

final

hashCode → int

The hash code for this object.

no setter, inherited

linearize → double Function(double)

Linearizes a display-encoded RGB component 0..255 to linear 0..100. This is the inverse transfer function (EOTF) scaled from 0..255 range.

final

linrgbFromScaledDiscount → List<List<double>>

Inverse of scaledDiscountFromLinrgb: CAM16 scaled discount → linear RGB.

final

name → String

Human-readable name for debugging.

final

rgbToXyz → List<List<double>>

The full 3x3 linear-RGB-to-XYZ matrix.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

scaledDiscountFromLinrgb → List<List<double>>

Composite matrix: linear RGB → CAM16 scaled discount. Equals fl/100 * diag(rgbD) * CAT16 * rgbToXyz.

final

trueDelinearize → double Function(double)

Delinearizes a linear RGB component 0..100 to display-encoded 0..255. This is the transfer function (OETF) scaled to the 0..255 range.

final

xyzToRgb → List<List<double>>

The full 3x3 XYZ-to-linear-RGB matrix.

final

yFromLinrgb → List<double>

The Y (luminance) row of the linear-RGB-to-XYZ matrix. For sRGB: 0.2126, 0.7152, 0.0722 (Rec. 709 primaries).

final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Properties

displayP3 → Gamut

Display P3 gamut.

final

rec2020 → Gamut

Rec. 2020 gamut.

final

srgb → Gamut

sRGB / Rec. 709 gamut.

final