public static CMYK FromRGB(RGBdouble value)
{
double
c = 1.0 - value.R,
m = 1.0 - value.G,
y = 1.0 - value.B,
k = 1.0;
if (c < k)
{
k = c;
}
if (m < k)
{
k = m;
}
if (y < k)
{
k = y;
}
if (k == 1.0)//black
{
c = m = y = 0.0;
}
else
{
c = (c - k) / (1.0 - k);
m = (m - k) / (1.0 - k);
y = (y - k) / (1.0 - k);
}
return(new CMYK(c, m, y, k));
}
public static XYZ FromRGB(RGBdouble value)
{
double
r = GammaCorrection(value.R),
g = GammaCorrection(value.G),
b = GammaCorrection(value.B);
//Observer. = 2°, Illuminant = D65
return(new XYZ(
r * 41.24 + g * 35.76 + b * 18.05,//multiplicated by 100
r * 21.26 + g * 71.52 + b * 7.22,
r * 1.93 + g * 11.92 + b * 95.05));
}
public static HSV FromRGB(RGBdouble col)
{
double
min = Math.Min(Math.Min(col.R, col.G), col.B),
max = Math.Max(Math.Max(col.R, col.G), col.B),
delta_max = max - min;
HSV ret = new HSV(0, 0, 0);
ret._v = max;
if (delta_max == 0.0)
{
ret._h = 0.0;
ret._s = 0.0;
}
else
{
ret._s = delta_max / max;
double del_R = (((max - col.R) / 6.0) + (delta_max / 2.0)) / delta_max;
double del_G = (((max - col.G) / 6.0) + (delta_max / 2.0)) / delta_max;
double del_B = (((max - col.B) / 6.0) + (delta_max / 2.0)) / delta_max;
if (col.R == max)
{
ret._h = del_B - del_G;
}
else if (col.G == max)
{
ret._h = (1.0 / 3.0) + del_R - del_B;
}
else if (col.B == max)
{
ret._h = (2.0 / 3.0) + del_G - del_R;
}
if (ret._h < 0.0)
{
ret._h += 1.0;
}
if (ret._h > 1.0)
{
ret._h -= 1.0;
}
}
return(ret);
}