r = color_rgb->Red;
g = color_rgb->Green;
b = color_rgb->Blue;
max = maxOf3Values( r, g, b );
min = minOf3Values( r, g, b );
dif = max - min;
//计算l，亮度
l = ( max + min ) * 240 / 255 / 2;
//计算h，色度
if( max == min )//无定义
{
s = 0;
h = 0;
}
else
{
//计算色度
if( max == r )
{
if( min == b )//h介于0到40
{
h = 40 * ( g - b ) / dif;
}
else if( min == g )//h介于200到240
{
h = 40 * ( g - b ) / dif + 240;
}
}
else if( max == g )
{
h = 40 * ( b - r ) / dif + 80;
}
else if( max == b )
{
h = 40 * ( r - g ) / dif + 160;
}
//计算饱和度
if( l == 0 )
{
s = 0;
}
else if( l <= 120 )
{
s = dif * 240 / ( max + min );
}
else
