public static ColorHSL RGBtoHSL(Color colorRGB)
{
var hsl = new ColorHSL();
float r, g, b, h, s, l; //this function works with floats between 0 and 1
r = colorRGB.R / 256.0f;
g = colorRGB.G / 256.0f;
b = colorRGB.B / 256.0f;
float maxColor = Math.Max(r, Math.Max(g, b));
float minColor = Math.Min(r, Math.Min(g, b));
//R == G == B, so it's a shade of gray
if (r == g && r == b)
{
h = 0.0f; //it doesn't matter what value it has
s = 0.0f;
l = r; //doesn't matter if you pick r, g, or b
}
else
{
l = (minColor + maxColor) / 2;
if (l < 0.5)
{
s = (maxColor - minColor) / (maxColor + minColor);
}
else
{
s = (maxColor - minColor) / (2.0f - maxColor - minColor);
}
if (r == maxColor)
{
h = (g - b) / (maxColor - minColor);
}
else if (g == maxColor)
{
h = 2.0f + (b - r) / (maxColor - minColor);
}
else
{
h = 4.0f + (r - g) / (maxColor - minColor);
}
h /= 6; //to bring it to a number between 0 and 1
if (h < 0)
{
h++;
}
}
hsl.H = (short)(h * 255);
hsl.L = (short)(l * 255);
hsl.S = (short)(s * 255);
return(hsl);
}
public static ColorHSL RGBtoHSL(Color colorRGB)
{
var hsl = new ColorHSL();
float r, g, b, h, s, l; //this function works with floats between 0 and 1
r = colorRGB.R / 256.0f;
g = colorRGB.G / 256.0f;
b = colorRGB.B / 256.0f;
float maxColor = Math.Max(r, Math.Max(g, b));
float minColor = Math.Min(r, Math.Min(g, b));
//R == G == B, so it's a shade of gray
if (r == g && r == b)
{
h = 0.0f; //it doesn't matter what value it has
s = 0.0f;
l = r; //doesn't matter if you pick r, g, or b
}
else
{
l = (minColor + maxColor) / 2;
if (l < 0.5) s = (maxColor - minColor) / (maxColor + minColor);
else s = (maxColor - minColor) / (2.0f - maxColor - minColor);
if (r == maxColor) h = (g - b) / (maxColor - minColor);
else if (g == maxColor) h = 2.0f + (b - r) / (maxColor - minColor);
else h = 4.0f + (r - g) / (maxColor - minColor);
h /= 6; //to bring it to a number between 0 and 1
if (h < 0) h++;
}
hsl.H = (short)(h * 255);
hsl.L = (short)(l * 255);
hsl.S = (short)(s * 255);
return hsl;
}
public static Color HSLtoRGB(ColorHSL colorHSL)
{
double r, g, b; //this function works with floats between 0 and 1
var h = colorHSL.H / 256.0;
var s = colorHSL.S / 256.0;
var l = colorHSL.L / 256.0;
//If saturation is 0, the color is a shade of gray
if (s == 0)
{
r = g = b = l;
}
else
{
//Set the temporary values
double temp2;
if (l < 0.5)
{
temp2 = l * (1 + s);
}
else
{
temp2 = (l + s) - (l * s);
}
double temp1 = 2 * l - temp2;
double tempr = h + 1.0 / 3.0;
if (tempr > 1)
{
tempr--;
}
double tempg = h;
double tempb = h - 1.0 / 3.0;
if (tempb < 0)
tempb++;
//Red
if (tempr < 1.0 / 6.0) r = temp1 + (temp2 - temp1) * 6.0 * tempr;
else if (tempr < 0.5) r = temp2;
else if (tempr < 2.0 / 3.0) r = temp1 + (temp2 - temp1) * ((2.0 / 3.0) - tempr) * 6.0;
else r = temp1;
//Green
if (tempg < 1.0 / 6.0) g = temp1 + (temp2 - temp1) * 6.0 * tempg;
else if (tempg < 0.5) g = temp2;
else if (tempg < 2.0 / 3.0) g = temp1 + (temp2 - temp1) * ((2.0 / 3.0) - tempg) * 6.0;
else g = temp1;
//Blue
if (tempb < 1.0 / 6.0) b = temp1 + (temp2 - temp1) * 6.0 * tempb;
else if (tempb < 0.5) b = temp2;
else if (tempb < 2.0 / 3.0) b = temp1 + (temp2 - temp1) * ((2.0 / 3.0) - tempb) * 6.0;
else b = temp1;
}
return Color.FromRgb(Convert.ToByte(r * 255), Convert.ToByte(g * 255), Convert.ToByte(b * 255));
}
public static Color HSLtoRGB(ColorHSL colorHSL)
{
double r, g, b; //this function works with floats between 0 and 1
var h = colorHSL.H / 256.0;
var s = colorHSL.S / 256.0;
var l = colorHSL.L / 256.0;
//If saturation is 0, the color is a shade of gray
if (s == 0)
{
r = g = b = l;
}
else
{
//Set the temporary values
double temp2;
if (l < 0.5)
{
temp2 = l * (1 + s);
}
else
{
temp2 = (l + s) - (l * s);
}
double temp1 = 2 * l - temp2;
double tempr = h + 1.0 / 3.0;
if (tempr > 1)
{
tempr--;
}
double tempg = h;
double tempb = h - 1.0 / 3.0;
if (tempb < 0)
{
tempb++;
}
//Red
if (tempr < 1.0 / 6.0)
{
r = temp1 + (temp2 - temp1) * 6.0 * tempr;
}
else if (tempr < 0.5)
{
r = temp2;
}
else if (tempr < 2.0 / 3.0)
{
r = temp1 + (temp2 - temp1) * ((2.0 / 3.0) - tempr) * 6.0;
}
else
{
r = temp1;
}
//Green
if (tempg < 1.0 / 6.0)
{
g = temp1 + (temp2 - temp1) * 6.0 * tempg;
}
else if (tempg < 0.5)
{
g = temp2;
}
else if (tempg < 2.0 / 3.0)
{
g = temp1 + (temp2 - temp1) * ((2.0 / 3.0) - tempg) * 6.0;
}
else
{
g = temp1;
}
//Blue
if (tempb < 1.0 / 6.0)
{
b = temp1 + (temp2 - temp1) * 6.0 * tempb;
}
else if (tempb < 0.5)
{
b = temp2;
}
else if (tempb < 2.0 / 3.0)
{
b = temp1 + (temp2 - temp1) * ((2.0 / 3.0) - tempb) * 6.0;
}
else
{
b = temp1;
}
}
return(Color.FromRgb(Convert.ToByte(r * 255), Convert.ToByte(g * 255), Convert.ToByte(b * 255)));
}
