Hue, from 0.0 to 360.0. Describes which color of the spectrum is
represented. A value of 0.0 represents red, as does 360.0. Values in
between go through all the hues representable in RGB. You can think of
this as selecting which color filter is placed over a light.
Lightness, from 0.0 to 1.0. The lightness of a color describes how bright
a color is. A value of 0.0 indicates black, and 1.0 indicates white. You
can think of this as the intensity of the light behind the filter. As the
lightness approaches 0.5, the colors get brighter and appear more
saturated, and over 0.5, the colors start to become less saturated and
approach white at 1.0.
Saturation, from 0.0 to 1.0. This describes how colorful the color is.
0.0 implies a shade of grey (i.e. no pigment), and 1.0 implies a color as
vibrant as that hue gets. You can think of this as the purity of the
color filter over the light.
