As red from yellow or green from blue or purple
Chroma – Quality of color we distinguish a strong color from a weak color
The degree of departure of a color sensation from that of white or grey
The intensity of a distinctive hue
Value – That quality we distinguish a light color from a dark one
Relates to the way artists mix colors
It is hard to chose RGB to obtain pink or brown
Instead an artist chooses a pure hue or pigment and lightens to a tint of that hue
By adding white or darkens it by adding black
More generally he adds white, black and gray.
H = selecting a color
S = desaturating the color (adding white)
V = adding black
RGB HSV
100 red 0 1 1
110 yellow 60 1 1
010 green 120 1 1
011 cyan 180 1 1
001 blue 240 1 1
101 magenta 300 1 1