Meanwhile, the HSV representation models how colors appear under light. Fully saturated colors are placed around a circle at a lightness value of ½, with a lightness value of 0 or 1 corresponding to fully black or white, respectively. to create "light red", a red pigment can be mixed with white paint this white paint corresponds to a high "lightness" value in the HSL representation). The HSL representation models the way different paints mix together to create color in the real world, with the lightness dimension resembling the varying amounts of black or white paint in the mixture (e.g. In these models, colors of each hue are arranged in a radial slice, around a central axis of neutral colors which ranges from black at the bottom to white at the top. HSL (for hue, saturation, lightness) and HSV (for hue, saturation, value also known as HSB, for hue, saturation, brightness) are alternative representations of the RGB color model, designed in the 1970s by computer graphics researchers to more closely align with the way human vision perceives color-making attributes. 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.
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