qualpal::metrics Namespace Reference

Color difference metrics for perceptual color comparison. More...

Classes
struct	CIE76
	CIE76 (Delta E 1976) color difference metric. More...
class	CIEDE2000
	CIEDE2000 (Delta E 2000) color difference metric. More...
class	DIN99d
	DIN99d color difference metric with optional power transformation. More...

Enumerations
enum class	MetricType { DIN99d , CIE76 , CIEDE2000 }
	Supported color difference metrics for palette generation and analysis. More...

Detailed Description

Color difference metrics for perceptual color comparison.

Contains functor classes implementing standard color difference formulas (DIN99d, CIE76, CIEDE2000) for quantifying perceptual differences between colors. Used in palette selection (e.g., farthestPoints()), palette analysis, and color distinguishability evaluation.

All metric classes:

• Are callable with operator() taking two color objects.
• Are template-based to accept any color type convertible to the required color space.
• Return a numeric difference value (Delta E; higher = more different).

See also

colorDifferenceMatrix() for computing full distance matrices.

farthestPoints() for palette selection using these metrics.

Enumeration Type Documentation

MetricType

enum class qualpal::metrics::MetricType

strong

Supported color difference metrics for palette generation and analysis.

Use this enum to select the color difference formula for qualpal algorithms, palette analysis, and CLI tools.

• DIN99d: Perceptually uniform metric, robust for small differences.
• CIE76: Simple Euclidean distance in Lab space (Delta E 1976).
• CIEDE2000: State-of-the-art perceptual metric (Delta E 2000).

Enumerator
DIN99d	DIN99d color difference.
CIE76	CIE76 (Delta E 1976) color difference.
CIEDE2000	CIEDE2000 (Delta E 2000) color difference.

Definition at line 90 of file metrics.h.