Macintosh Color Picker

The Macintosh Color Picker lists on the left several different ways in which you can pick a color, including crayon colors, RGB, HLS and HSV.

If you use the HLS method, you can click anywhere in the color wheel to set the hue and saturation, with minimum saturation corresponding to the center of the wheel and maximum saturation to the edge of the wheel. Move the slider on the bottom to set the lightness.

See also
Color
Color Preferences