十六进制表示颜色的用法（Sixteen decimal means the use of colors）.doc

十六进制表示颜色的用法（Sixteen decimal means the use of colors） There are two kinds of colors that are seen in the human eye: There is a color emitted by the light emitting body, such as the computer display screen display color; The other is the object itself is not light, but the light reflected from the color, such as reading newspapers and magazines on the color. We also know that any color is formed by the superposition of three basic colors. These three colors are called primary colors. 1. In the first color mentioned above, the illuminant color pattern, also known as the color mode, color reproduction is red and green and blue in three colors. Additive mode is also called RGB mode; For print, this color pattern, also known as the subtractive mode, it is the primary colors of blue and red, yellow three colors. The subtractive model is also known as the CMY mode. For example, to specify a color on the web, you use the RGB model to determine the method is to specify R/G/B respectively, it is red / Green / blue three color intensity, are usually required for each color strength for a minimum of 0, up to 255, and usually 16 hexadecimal numeric representation, then 255 corresponds to sixteen hexadecimal is FF, and the three numerical are tied up, beginning to #. For example, the color value #FF0000 is red because the red value reaches the highest value FF (i.e., decimal 255), and the remaining two colors are 0. For example, #FFFF00 means yellow, because when the red and green are the maximum and the blue is 0, the yellow is produced. Here we have a clear idea of how to express the colors in common use. For example, defined in the HTML language specification, you can specify colors in two ways. One way is to define the color name, specific color names for different browsers are different. The another way through a 6 to sixteen hexadecimal # at the beginning of the numerical representation of a color. The 6 digits were divided into 3 groups, each with two digits, indicating the