Jemima's Chevron: Color Wheel: "A saturation of 1 (or 100%) means full color. Value is sometimes called brightness - a value of 0 is black, while a value of 1 (or 100%) indicates a pure color or pure white.
Because RGB is so opaque, I converted the underlying wheel mechanics to HSV, and added an SV square to the right of the color wheel corresponding to the last chosen color. On my SV square, saturation ranges from 0 at the left to 1 at the right, and value ranges from 0 at the bottom to 1 at the top.
FYI, HSL is like HSV, but uses lightness, which ranges from pure black to pure white, in the place of value. Pure color appears in the middle of the L scale (not shown)"
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