有关hsv与rgb的问题

这是两种最常用的颜色格式。
hsv 是一色度，亮度，饱和对来表示颜色空间的。RGB就是我们最熟悉的红绿蓝来表示颜色。
HSV的范围大多数是如下定义的：
H： 0-360
S，V： 0-1
但也有的H：0-180
S：0-255
V：0-255
这取决于平台级软件的定义。
RGB一般就是取0-255，也有的去0-1.
下面是两者的转换代码：
/// <summary>

/// Convert HSV to RGB
/// h is from 0-360
/// s,v values are 0-1
/// r,g,b values are 0-255
/// Based upon http://ilab.usc.edu/wiki/index.php/HSV_And_H2SV_Color_Space#HSV_Transformation_C_.2F_C.2B.2B_Code_2 /// </summary>
void HsvToRgb(double h, double S, double V, out int r, out int g, out int b)
{
// ######################################################################
// T. Nathan Mundhenk
// mundhenk@usc.edu
// C/C++ Macro HSV to RGB
double H = h;
while (H < 0) { H += 360; };
while (H >= 360) { H -= 360; };
double R, G, B;
if (V <= 0)
{ R = G = B = 0; }
else if (S <= 0)
{
R = G = B = V;
}
else
{
double hf = H / 60.0;
int i = (int)Math.Floor(hf);
double f = hf - i;
double pv = V * (1 - S);
double qv = V * (1 - S * f);
double tv = V * (1 - S * (1 - f));
switch (i)
{
// Red is the dominant color
case 0:
R = V;
G = tv;
B = pv;
break;
// Green is the dominant color
case 1:
R = qv;
G = V;
B = pv;
break;
case 2:
R = pv;
G = V;
B = tv;
break;
// Blue is the dominant color
case 3:
R = pv;
G = qv;
B = V;
break;
case 4:
R = tv;
G = pv;
B = V;
break;
// Red is the dominant color
case 5:
R = V;
G = pv;
B = qv;
break;
// Just in case we overshoot on our math by a little, we put these here. Since its a switch it won't slow us down at all to put these here.
case 6:
R = V;
G = tv;
B = pv;
break;
case -1:
R = V;
G = pv;
B = qv;
break;
// The color is not defined, we should throw an error.
default:
//LFATAL("i Value error in Pixel conversion, Value is %d", i);
R = G = B = V; // Just pretend its black/white
break;
}
}
r = Clamp((int)(R * 255.0));
g = Clamp((int)(G * 255.0));
b = Clamp((int)(B * 255.0));
}
/// <summary>
/// Clamp a value to 0-255
/// </summary>
int Clamp(int i)
{
if (i < 0) return 0;
if (i > 255) return 255;
return i;
}

And here's how you'd use it:

int r,g,b;
HsvToRgb(110, 1, 1, out r, out g, out b);