Munsell

Albert Munsell, Color Notation 1905

Munsell's color notation was the first to arrange the color perception components, hue, value, and chroma, into a three-dimensional arrangement. There 10 hues in Munsell's notation: R, YR, Y, GY, G, BG, B, PB, P, RP. Value ranges from 0 (black) to 10 (white). Chroma ranges from 0 (gray) to 30+. The hue is specified first, followed by value/chroma; e.g., 5R 3/4 is a red of value 3, chroma 4. There is a reasonable introduction to Munsell in the Wikipedia. Data for conversion from Munsell to CIE XYZ can be found here. An online tool for exploring Munsell (unfortunately, Windows only) can be found here.

Uncalibrated Munsell to RGB conversion tables

value	R	RP	P	PB	B	BG	G	GY	Y	YR
9	243 225 222	254 219 235	237 223 253	226 228 239	213 232 239	99 252 233	146 251 176	152 252 136	240 235 16	243 227 201
8	253 187 152	248 185 198	223 188 250	174 204 247	82 220 238	24 227 196	65 229 134	58 233 59	211 207 52	249 194 22
7	248 151 96	243 147 181	195 158 253	125 178 251	15 190 241	54 194 192	45 199 142	119 195 43	194 177 13	241 157 36
6	249 101 100	248 93 163	201 111 244	54 152 253	61 160 198	72 163 155	38 170 101	102 165 49	173 147 41	236 116 20
5	247 23 23	228 45 142	200 32 251	87 110 248	20 133 172	47 136 130	16 140 100	49 141 52	154 118 23	196 95 24
4	195 25 29	186 24 118	161 22 200	75 68 251	39 105 134	54 107 104	35 111 82	61 110 28	122 94 33	173 62 25
3	148 19 29	144 13 82	114 24 165	69 28 216	14 79 113	29 82 81	21 85 55	10 87 31	95 71 6	110 63 31
2	106 3 18	98 11 71	81 13 116	52 19 149	18 56 73	8 58 58	28 58 42	15 60 28	59 52 10	72 47 24

Uncalibrated neutral (gray) values

Neutral	RGB
N0	0 0 0
N1	34 34 34
N2	52 52 52
N3	73 73 73
N4	97 97 97
N5	122 122 122
N6	147 147 147
N7	173 173 173
N8	200 200 200
N9	228 228 228
N9.5	243 243 243
N10	255 255 255

Hue, value, and chroma are all equal perceptual spacing!

5Y 8/10 and 5PB 4/20

Each hue goes from 0 to 10, e.g. 2.5RP; value goes from 0 to 10; and chroma goes from 0 to 30+