在任何标准图片中，像素是三个相关联的成员序列，这三个成员指示像素的红、绿、蓝(RGB)通道的混合度(因而能指定颜色)。
In any standard image, a pixel has a sequence of three Numbers associated with it that dictate the mixture of the red, green, and blue (RGB) channels for the pixel (and therefore the color displayed).
一个拥有不透明通道的子类需要重写这个方法来返回指定了透明值的颜色对象。
A subclass with explicit opacity components should override this method to return a color with the specified alpha.
为指定类别清除输出通道颜色配置文件设置。
Clears the output channel color profile setting for a specified category.
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