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6.1 The Color Model The color value is a hexadecimal number in the range 000000-FFFFFF. This range covers over 16 million possible colors. The way the color value is represented in this 6-digit hexadecimal format is very common. However, an explanation is provided here, just in case you haven't come across this type of color representation before. The color model is comprised of red, green and blue values (known as RGB). The red value is defined in the first 2 hex digits, the green value in the middle 2, and the blue value in the last 2. So, if a red value of 1, a green value of 2 and a blue value of 3 was required, the hexadecimal number would be "010203". All very well, you may think, but what do all these value actually mean? Well, the individual RGB values range from 00-FF. Values at the lower range of this scale mean less of that color, values at the higher range of the scale mean more of that color. If, for example, you wished to define a pure red color, you would want the highest possible red color (FF). When arranged in the RGB color model, this would be shown as FF0000 (red is FF, green is 00, and blue is 00). Pure green would be 00FF00 (red is 00, green is FF, and blue is 00). Pure blue would be 0000FF (red is 00, green is 00, and blue is FF). The following color chart shows common colors and their values:
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