public static (double, double, double) RgbToHsl(double r, double g, double b)
{
double h, s, l;
double min = Math.Min(Math.Min(r, g), b);
double max = Math.Max(Math.Max(r, g), b);
double delta = max - min;
l = (max + min) / 2.0;
if (delta <= 0.01)
{
h = 0.0;
// reduce saturation for low lightness colors
s = ColorMath.LinearInterpolation(delta, 0.005, 0.01, 0, delta / (max + min));
}
else
{
s = l <= 0.5 ? delta / (max + min) : delta / (2.0 - max - min);
double hue;
if (r >= max)
{
hue = (g - b) / 6.0 / delta;
}
else if (g >= max)
{
hue = 1.0 / 3.0 + (b - r) / 6.0 / delta;
}
else
{
hue = 2.0 / 3.0 + (r - g) / 6.0 / delta;
}
if (hue < 0.0)
{
hue += 1.0;
}
if (hue > 1.0)
{
hue -= 1.0;
}
h = hue * 360.0;
}
return(h, s, l);
}
public static (double, double, double) RgbToHsv(double r, double g, double b)
{
double delta, min;
double h = 0.0, s, v;
min = Math.Min(Math.Min(r, g), b);
v = Math.Max(Math.Max(r, g), b);
delta = v - min;
if (v <= 0.12)
{
// reduce saturation for low value colors
s = ColorMath.LinearInterpolation(v, 0.005, 0.12, 0, delta / v);
}
else
{
s = delta / v;
}
if (s <= 0.001)
{
h = 0.0;
}
else
{
if (r.AboutEqual(v))
{
h = (g - b) / delta;
}
else if (g.AboutEqual(v))
{
h = 2.0 + (b - r) / delta;
}
else if (b.AboutEqual(v))
{
h = 4.0 + (r - g) / delta;
}
h *= 60.0;
if (h < 0.0)
{
h = h + 360.0;
}
}
return(h, s, v);
}
