Jemima's Chevron: Color Wheel: "The first pair of digits represents the red value (in hexadecimal form), the second pair represents green, and the third blue. Adding the prescribed amounts of red, green and blue together produces a color, but it's difficult for the human user to see the correspondence between #333300 and olive green.
HSV is an alternate color map which is more user-friendly. Hue means the color itself. In HSV color wheels like the 4096 Color Wheel, hue corresponds to the angle, with pure red at 0 degrees and green around 120 degrees"