C++图象特效示例——灰度转换，使用F1~F4控制转换灰度的方式，F5为增加图象的对比度。F1=平均值法转换，F2=最大值法转换，F3=加权平均值法转换，F4=恢复彩色。ConvertToGrayScale灰度转换函数是本程序的关键，函数参数：Method为转换灰度的方式，值可设置为：

　　MAXIMUM_GRAY=最大值法,MEAN_GRAY=平均值法

　　WEIGHT_GRAY=加权平均值法

　　Color目前只能为8即只能处理8位调色板方式-Example C++ image effects- Grayscale conversion, use F1 ~ F4 control to convert grayscale way, F5 to increase the image contrast. F1 = the average of the conversion law, F2 = maximum method conversion, F3 = weighted average of the conversion law, F4 = restore color. ConvertToGrayScale grayscale conversion function is the key function parameters of this procedure: Method to convert grayscale way, value can be set to:

MAXIMUM_GRAY = max method, MEAN_GRAY = average of Law

WEIGHT_GRAY = weighted average of the Act

Color currently only eight palettes that can only handle eight ways