public static int[] HSBToRGB(float[] hsb)
{
var rgb = new float[3];
var hValue = hsb[0];
/*
Firstly, we need to calculate RGB value, when the HSB value is (h,100%,100%).
H Color Value
----------------------------
0-60 G 0->255
60-120 R 255->0
120-180 B 0->255
180-240 G 255->0
240-360 R 0->255
300-360 B 255->0
*/
if (hValue <= 60)
{
rgb[0] = 255;
rgb[1] = hValue / 60.0f * 255;
}
else if (hValue <= 120)
{
hValue -= 60;
rgb[1] = 255;
rgb[0] = (1 - hValue / 60.0f) * 255;
}
else if (hValue <= 180)
{
hValue -= 120;
rgb[1] = 255;
rgb[2] = hValue / 60.0f * 255;
}
else if (hValue <= 240)
{
rgb[2] = 255;
hValue -= 180;
rgb[1] = (1 - hValue / 60.0f) * 255;
}
else if (hValue <= 300)
{
rgb[2] = 255;
hValue -= 240;
rgb[0] = hValue / 60.0f * 255;
}
else
{
hValue -= 300;
rgb[0] = 255;
rgb[2] = (1 - hValue / 60.0f) * 255;
}
/*
Secondly, acorrding to the value of staturation, we can calculate the rgb value, when the value of hsb is (h,s,100%)
-------------------------
r"= r'+ (255 - r') * s
g"= g'+ (255 - g') * s
b"= b'+ (255 - b') * s
*/
for (int i = 0; i < 3; i++)
{
rgb[i] += (255 - rgb[i]) * hsb[1];
}
var result = new int[3];
/*
Finally, we need to calculate the real value of rgb, according to the value of brightness
r = r" * br
g = g" * br
b = g" * br
*/
for (int i = 0; i < 3; i++)
{
rgb[i] *= hsb[2];
result[i] = (int)(rgb[i] + 0.5);
}
return result;
}
