RGB which stands for Red, Green, Blue. Each can have a value from 0 (none of that color) to 255 (fully that color). The format for RGB is - rgb(RED, GREEN, BLUE), just like the name implies. Below is an example of RGB in use.
Red, Green, and Blue Values:
bgcolor="rgb(255,255,255)" White
bgcolor="rgb(255,0,0)" Red
bgcolor="rgb(0,255,0)" Green
bgcolor="rgb(0,0,255)" Blue
HTML Color Code - Breaking the Code
The following table shows how letters are incorporated into the hexadecimal essentially extending the numbers system to 16 values. Hang in there it all makes sense shortly.
A Real Hexadecimal:
bgcolor="#FFFFFF"
The letter "F" is the maximum amount we can send each color and as you may deduce, this color (#FFFFFF) represents the color white. A formula exists to calculate the numeric equivalent of a hexadecimal.
Hexadecimal Formula:
(15 * 16) + (15) = 255
The formula is real simple. Take the first value (F) or 15 multiply it by 16 and add it to the second value, 15. The value 255 is the maximum allowed for any primary color.
Let's try another one.
Example 2:
bgcolor="#CC7005"
CC(RR - Red)
(12 * 16) + (12) = 204
70(GG - Green)
(7 * 16) + (0) = 112
05(BB - Blue)
(0 * 16) + (5) = 5
If you want to be absolutely sure your colors will not change, use paired hex values for color. Examples: "#0011EE", "#44HHFF", or "#117788". These are called True Colors, since they will stay true in hue from browser to browser.
Notice from vizskywalker:
Fixed small typo in the title
