Ok, lets take it a step at a time. Look at the first part of the sentence in bold. All colors can be expressed in terms of their red, green, and blue (RGB) content. The intensity of these colors can range from a value of 0 to 255 (0 being the minimum, and 255 the maximum). For example:
255,0,0 is Bright Red.
0,255,0 is Bright Green.
0,0,255 is Bright Blue.
0,0,0 is Black.
I cant show white on this background, but it's 255,255,255.
There are several other combinations you can make such as:
50,110,0 is a Dark Green.
120,0,90 is a Dark Purple .
COLOR="#RR GG BB"
Now, how do you get the hexadecimal values of red, green, and blue from the three 0 to 255 numbers? That's usually the hard part. Fortunately, there are shareware programs you can get from the Web which can do this for you. Coulor Codes is a program I would recommend; go to my tools tutorial for a more detailed explanation.
I don't want to try to explain the conversion, but I will explain why there are letters as well as numbers. The hexadecimal system is represented by the following in increasing order.
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (16 total)
They basically represent 0 through 15, where the letters A though F are used to represent numbers 10 through 15 as a single digit. Pretty strange, hu? Two digit hexadecimal counting looks like this.
37, 38, 39, 3A, 3B, 3C, 3D, 3E, 3F, 40, 41, 42, 43, 44,
45, 46, 47, 48, 49, 4A, 4B, 4C, 4D, 4E, 4F, 50, 51, 52
Now, suppose we want to increase the red content of the color just a little. To do this we would increase the 1 up to a 5, 9, or maybe even an F. The results are as follows.
The change is too small, you say? There is a difference in the colors, but not much. Now, let us change the red in a more dramatic way. Let us change the A to a B, D, and F. The results are shown below.
Now you can see the difference, I'm sure. By changing the first digit,
you are making a change that is 16 times as much as a second digit change. The same concept
also applies to both green and blue. That's all there is to it. Have fun creating colors.