Enum QuantTableConfig 

#[non_exhaustive]
pub enum QuantTableConfig {
    Perceptual,
    CustomBase {
        luma: [f32; 64],
        cb: [f32; 64],
        cr: [f32; 64],
    },
    Exact {
        luma: [u16; 64],
        cb: [u16; 64],
        cr: [u16; 64],
    },
}

Quantization table configuration.

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.

Perceptual

Jpegli’s perceptual tables, scaled by Quality. (default)

CustomBase

Custom base matrices, scaled by Quality. Provide f32 matrices (typically 1.0–255.0 range). These are multiplied by the quality-derived scale factor.

Fields

luma: [f32; 64]

Luma (Y) base matrix - 64 coefficients in row-major order

cb: [f32; 64]

Blue chroma (Cb) base matrix - 64 coefficients in row-major order

cr: [f32; 64]

Red chroma (Cr) base matrix - 64 coefficients in row-major order

Exact

Exact quantization tables. Quality is ignored. Values should be in range 1-255 for baseline JPEG compatibility.

Fields

luma: [u16; 64]

Luma (Y) quantization table - 64 coefficients in row-major order

cb: [u16; 64]

Blue chroma (Cb) quantization table - 64 coefficients in row-major order

cr: [u16; 64]

Red chroma (Cr) quantization table - 64 coefficients in row-major order

Trait Implementations

impl Clone for QuantTableConfig

fn clone(&self) -> QuantTableConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QuantTableConfig

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

Formats the value using the given formatter.

impl Default for QuantTableConfig

fn default() -> QuantTableConfig

Returns the “default value” for a type.