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All colors on a computer are represented by combinations of Red, Green and Blue, or RGB. Different levels of each of these three result in different colors. The levels are defined by numbers from 0-255. In Photoshop you can look up or change individual levels for a specific color by clicking on the color you have currently selected. For instance I created a mustard yellow in Adobe Photoshop with Red=215, Green=172, Blue=23. In shorthand, this can be written 215,172,23.
HTML is the same except the levels are represented in hexadecimal which is a base-16 number system (has 16 digits, 0-9,a,b,c,d,e,f) instead of our normal number system which is base-10 (has 10 digits, 0-9).
To quickly find an HTML color code, find out the RGB levels and convert them to hexadecimal using the chart below. For instance, if you wanted to convert the number 202 to hexadecimal, find 202 in the green section of the chart. Follow the row to the left for the first digit of the hex equivalent. You get "C." Then follow the column to the top for the second digit. You get "A." Thus, the hex equivalent of 202 is CA.

Base-10 Hex
202 = C A

You can use the same method to get the mustard yellow described above.
Red: 215 equals D7 in hex.
Green: 172 equals AC in hex.
Blue: 23 equal 17 in hex.
So the hex code for mustard yellow is D7AC17 and the HTML would look like this:
<font color="D7AC17">

Base
10
2nd Hex Digit
0 1 2 3 4 5 6 7 8 9 A B C D E F
1
s
t

H
e
x

D
i
g
i
t
0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
2 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
3 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
4 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79
5 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
6 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111
7 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
8 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
9 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
A 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175
B 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
C 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207
D 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223
E 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
F 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
 

Page updated 02/15/2002