Hexadecimal numbers :
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F
Hexadecimal numbers are used to represent the 16,581,375
possible colors on your screen. The six digits are taken in pairs to represent the red, green, and blue components of the color. For instance < COLOR="#FFFFFF" > is white, since it has the maximum value, FF=255, for each color. Likewise, < #000000 > makes black. There are 255 shades of each color, so the total is 255 x 255 x 255, over 16 million. Just for the heck of it, here is the binary code the computer uses for that number:
111111111111111111111111111111111111111111111111
|
000000
|
000040
|
000080
|
0000B0
|
0000B4
|
0000FF
|
A0A0A0
|
B00B00
|
004000
|
008000
|
00B000 |
00F000 |
F00000 |
EEDDCC |
FFEEDD |
00FFFF |
EEEE88 |
AA44EE |
00BB99 |
123456
|
789ABC |
DEFFFF |
DD00DD |
FEDCBA |
|