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The LCH color code stands for Lightness, Chroma, and Hue. It is a cylindrical representation of the CIELAB (LAB) color space, designed to be more intuitive for human understanding. 'Lightness' represents the brightness of the color, 'Chroma' indicates the intensity or saturation, and 'Hue' specifies the color itself (e.g., red, blue, green) as an angle on the color wheel. LCH is particularly valued in design and colorimetry for its perceptual uniformity, meaning that changes in numerical values correspond relatively well to visual changes perceived by the human eye.
OKLCH is a color space that combines the perceptual uniformity of OKLAB with the intuitive cylindrical coordinates of LCH (Lightness, Chroma, Hue). It is increasingly becoming the preferred color space for modern web design and CSS because it allows for predictable color manipulation—such as creating harmonious palettes or adjusting lightness without shifting the perceived hue—better than HSL or standard LCH. It is natively supported in modern CSS Color Module Level 4, enabling more vibrant and accessible color schemes.