The RGB attribute is indicated by a 6-digit hexadecimal number with the first 2 digits representing the amount of Red, the 3rd and 4th digits indicating the amount of Green and the last 2 digits, the amount of Blue.
Hexadecimal is a base 16 number system that uses the digits 0-9 and the letters A-F to represent the numbers 10-15 respectively. Thus, the 2-digit number representing each color component can range from 00 (value 0) through FF (value 255).
If you are not familiar with the mathematical theory behind number systems, not to worry, there is a simple way to convert colors to their hexadecimal components using two of the built-in applets of Windows. The applets you will need are Paint and Calculator. By default, Windows 95 installs both these applications in the Start ¦ Programs ¦ Accessories menu.
From Paint, select Edit Colors from the Options menu, then click the button labeled Define Custom Colors. Your screen should look like this:
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In the Calculator, select Scientific from the View menu and you will see this:
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In the Color Editor, drag the mouse pointer over the Color Cube until
it is on the approximate color you want. The narrow bar to the right represents
the 3rd dimension of the cube. When you have the color as close
as you can get to what you want in the Color Cube, drag the pointer up
and down until the desired color appears in the Color Selection Box. The
RGB color components will then appear in the Color Index Numbers in decimal
(base 10) format. Take each of these three numbers in order to the Calculator.
Making sure that the Number System Conversion is set to Dec, enter
the number and then select Hex in the Number System Conversion.
This converts the number to Hexadecimal. You can then select Copy
from the Edit menu and then paste the number into your HTML
document. Make sure that the Number System is reset to Dec each
time, and repeat the process for each of the three numbers. In the example
shown above, the RGB values of 111, 108, 200 converts to hexadecimal 6f6cc8.