In each cylinder, the angle around the central vertical axis corresponds to " hue", the distance from the axis corresponds to " saturation", and the distance along the axis corresponds to " lightness", "value" or " brightness". (For technical definitions of these terms, see below.) However, while typically consistent, these definitions are not standardized, and any of these abbreviations might be used for any of these three or several other related cylindrical models. A third model, common in computer vision applications, is HSI, for hue, saturation, and intensity. HSV stands for hue, saturation, and value, and is also often called HSB ( B for brightness). HSL stands for hue, saturation, and lightness, and is often also called HLS. Developed in the 1970s for computer graphics applications, HSL and HSV are used today in color pickers, in image editing software, and less commonly in image analysis and computer vision. The two representations rearrange the geometry of RGB in an attempt to be more intuitive and perceptually relevant than the cartesian (cube) representation. HSL and HSV are the two most common cylindrical-coordinate representations of points in an RGB color model. Below: two-dimensional plots showing two of a model's three parameters at once, holding the other constant: cylindrical shells (b, f) of constant saturation, in this case the outside surface of each cylinder horizontal cross-sections (c, g) of constant HSL lightness or HSV value, in this case the slices halfway down each cylinder and rectangular vertical cross-sections (d, h) of constant hue, in this case of hues 0° red and its complement 180° cyan. Above (a, e): cut-away 3D models of each. Alternative representations of the RGB color model Fig.
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