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A color wheel is a tool that provides a visual representation of the relationships between all possible hues. The primary colors are arranged around a circle at equal (120 degree) intervals. (Warning: Color wheels frequently depict "Painter's Colors" primary colors, which leads to a different set of hues than additive colors.)
Fig. 1. HSL (a–d) and HSV (e–h). Above (a, e): cut-away 3D models of each. 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 ...
The HSV color space coordinates describe a color in terms of the hue, given as degrees, combined with a saturation and a value, both represented as percentages. (Value is similar to brightness in this usage.) In Wikipedia, the HSV coordinates are represented as three numbers separated by commas and identified as either degrees or percentage, as ...
MacEvoy's extensive site about color science and paint mixing is one of the best resources on the web. On this page, he explains the color-making attributes, and the general goals and history of color order systems—including HSL and HSV—and their practical relevance to painters. Smith, Alvy Ray (August 1978). "Color gamut transform pairs".
The difference is that a perfectly light color in HSL is pure white; but a perfectly bright color in HSV is analogous to shining a white light on a colored object. I.e. shining a bright white light on a red object causes the object to still appear red, just brighter and more intense.
English: Color wheel based on the HSV color space. Hue is represented by the angle from the top (red) going clockwise, saturation is represented by distance from the center, and value is a constant 100% (255).
English: The RGB color space is often, for conceptual or computational convenience, represented with polar coordinates. Three possible such representations are shown here, along with their geometrical derivation from the RGB cube. For details, see the articles RGB color model and HSL and HSV.
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