public static HSB HSL2HSB(HSL hsl)
{
HSB hsb;
hsb.H = (byte)(255.0 * hsl.H);
hsb.S = (byte)(255.0 * hsl.S);
if ((0.1793 <= hsl.L) && (hsl.L <= 0.9821))
{
hsb.B = (byte)(257.7 + 149.9 * Math.Log(hsl.L));
}
else
{
hsb.B = 0;
}
return(hsb);
}
// based on http://www.geekymonkey.com/Programming/CSharp/RGB2HSL_HSL2RGB.htm
// Given H,S,L in range of 0-1
// Returns a Color (RGB struct) in range of 0-255
public static Color HSL2RGB(HSL hsl)
{
double v;
double r, g, b;
r = hsl.L; // default to gray
g = hsl.L;
b = hsl.L;
v = (hsl.L <= 0.5) ? (hsl.L * (1.0 + hsl.S)) : (hsl.L + hsl.S - hsl.L * hsl.S);
if (v > 0)
{
double m;
double sv;
int sextant;
double fract, vsf, mid1, mid2;
m = hsl.L + hsl.L - v;
sv = (v - m) / v;
hsl.H *= 6.0;
sextant = (int)hsl.H;
fract = hsl.H - sextant;
vsf = v * sv * fract;
mid1 = m + vsf;
mid2 = v - vsf;
switch (sextant)
{
case 0:
r = v;
g = mid1;
b = m;
break;
case 1:
r = mid2;
g = v;
b = m;
break;
case 2:
r = m;
g = v;
b = mid1;
break;
case 3:
r = m;
g = mid2;
b = v;
break;
case 4:
r = mid1;
g = m;
b = v;
break;
case 5:
r = v;
g = m;
b = mid2;
break;
}
}
return(Color.FromArgb(Convert.ToByte(r * 255.0f), Convert.ToByte(g * 255.0f), Convert.ToByte(b * 255.0f)));
}