216 Web-Safe Color Chart

The color codes use a six-digit hexadecimal notation, such as "000000" for black or "FFFFFF" for white. The first two digits are the amount of red, the second two the amount of green. The third set of two digits represent the amount of blue in the color.

The amount of red, green or blue in the color can be 00, 33, 66, 99, CC, or FF. Three colors and six possible values for each result in 216 colors.  Other color combinations are possible, but these 216 colors appear the same on a variety of computer platforms.

The first small chart demonstrates that equal amounts of each color creates grays.  The next three charts display the 216 colors in three different arrangements.  The first color chart explores red by setting the Red in RGB to FF, 100%, and creating 36 combinations.  then decrementing it to CC, 99, 66,33, and 00. The second chart explores green and the third chart explores blue.