Enum TransferFunction 

pub enum TransferFunction {
    SRgb,
    SegmentedGamma {
        gamma: f64,
        offset: f64,
        linear_part: bool,
    },
    Gamma(f64),
    Linear,
    Pq,
    Hlg {
        peak_luminance: f64,
    },
}

Electro-optical transfer function describing how an encoded RGB signal maps to linear light. Each variant defines an eotf (encoded -> linear) and its analytic inverse oetf (linear -> encoded); the pair is exact so that rgb_to_xyz / xyz_to_rgb round-trip.

Variants

SRgb

sRGB / Display P3 piecewise transfer function (IEC 61966-2-1).

SegmentedGamma

Parameterized sRGB-family piecewise transfer function used by the legacy srgb_to_xyz / xyz_to_srgb: value = ((E - offset) / (1 - offset)) ^ gamma, with a linear toe E / 12.92 when linear_part is set.

Fields

gamma: f64

offset: f64

linear_part: bool

Gamma(f64)

Pure power law linear = encoded ^ gamma (e.g. Adobe RGB gamma 2.2).

Linear

Identity transfer (values are already linear).

Pq

SMPTE ST 2084 (PQ) perceptual quantizer. Linear 1.0 is the 10000 cd/m² peak.

Hlg

ARIB STD-B67 / Rec.2100 HLG. peak_luminance (cd/m²) sets the display system gamma; linear 1.0 is the peak white.

Fields

peak_luminance: f64

Implementations

impl TransferFunction

pub fn eotf(self, encoded: f64) -> f64

Encoded signal value -> linear light (both in [0, 1] for sRGB/P3/gamma; PQ/HLG output is normalized so 1.0 is the display peak).

pub fn oetf(self, linear: f64) -> f64

Linear light -> encoded signal value (analytic inverse of eotf).

Trait Implementations

impl Clone for TransferFunction

fn clone(&self) -> TransferFunction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TransferFunction

impl Debug for TransferFunction

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

Formats the value using the given formatter.

impl PartialEq for TransferFunction

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for TransferFunction