Perceptually uniform color space designed for measuring color differences. Overview CIE LAB (also written as CIELAB or Lab*) is designed to be perceptually uniform, meaning that equal distances in LAB space correspond to roughly equal perceived color differences. This makes it ideal for: Color difference calculations …

Device-independent color space based on human vision tristimulus values. Overview CIE XYZ is the foundation of colorimetry. It's based on how the human eye perceives color through three types of cone cells (L, M, S). XYZ values are device-independent and serve as an intermediate space for most color conversions. RGB to …

Quantifying perceptual differences between colors using Delta E metrics. Overview Color difference formulas quantify how different two colors appear to the human eye. They're essential for: Quality control in manufacturing Color matching and reproduction Perceptual image processing Color tolerance specifications Delta …

Practical guides and mathematical foundations for color science, color spaces, and image processing. Tristimulus Values & Color Matching Functions Color perception is based on three types of cone cells in the human eye. The CIE defined standard color matching functions $\bar{x}(\lambda)$, $\bar{y}(\lambda)$, …

Reference light sources used in colorimetry for consistent color measurement and reproduction. Overview Standard illuminants define the spectral power distribution (SPD) of light sources. They're essential for: Color measurement and specification Chromatic adaptation (adjusting colors for different lighting) Color …