HSL
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A cylindrical color model that describes colors using hue, saturation, and lightness, designed to be intuitive for human color selection.
HSL represents color as an angle on the color wheel (hue, 0-360), a percentage of color intensity (saturation, 0-100%), and a percentage of lightness (0-100% where 0% is black and 100% is white). At 50% lightness, the pure hue is displayed. HSL is widely used in CSS (the hsl() function) because it makes it easy to create tints, shades, and tones by adjusting a single parameter. It is more intuitive than RGB for design work but has the limitation of not being perceptually uniform, meaning equal numeric changes do not always produce equal visual changes.
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