Struct DiffuseWhite 

pub struct DiffuseWhite(/* private fields */);

The absolute luminance, in cd/m² (nits), that a relative-linear sample value of 1.0 represents — the “diffuse white” (a.k.a. nominal diffuse white / SDR reference white) anchor that bridges relative-linear pixel data to absolute display light.

This is the single scalar the rest of the industry uses for that bridge: OpenEXR’s whiteLuminance (“nits of RGB (1,1,1)”), JPEG XL’s intensity_target, libheif’s ndwt (nominal diffuse white), and libplacebo’s SDR-white constant. The cross-vendor default is BT2408 = 203 cd/m².

It is a typed anchor on purpose: HDR code mixes nits, PQ-encoded [0,1], log2 gain, and headroom ratios — passing a bare f32 invites unit confusion. Use DiffuseWhite::new / DiffuseWhite::nits.

Implementations

impl DiffuseWhite

pub const BT2408: DiffuseWhite

ITU-R BT.2408 HDR reference white: 203 cd/m². The cross-industry default anchor for relative-linear HDR (matches Chrome SDRWhiteLevel, Skia skcms, CSS rec2100-linear, and libplacebo).

pub const fn new(nits: f32) -> DiffuseWhite

An anchor of nits cd/m² (the luminance that relative-linear 1.0 represents).

pub const fn nits(self) -> f32

The anchor in cd/m² (nits).

Trait Implementations

impl Clone for DiffuseWhite

fn clone(&self) -> DiffuseWhite

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for DiffuseWhite

impl Debug for DiffuseWhite

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

Formats the value using the given formatter.

impl Default for DiffuseWhite

fn default() -> DiffuseWhite

BT2408 — 203 cd/m².

impl Eq for DiffuseWhite

impl PartialEq for DiffuseWhite

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.