/// <summary>
/// Convert to CIE from RGB
/// </summary>
/// <param name="R">Set Red</param>
/// <param name="G">Set Green</param>
/// <param name="B">Set Blue</param>
/// <param name="Scale">Set scale</param>
/// <returns></returns>
public static CIELabColor CIELabFromRGB(float R, float G, float B, float Scale)
{
float inv_scale = 1f / Scale;
XYZColor xyz = XYZColor.FromRGB(R * inv_scale, G * inv_scale, B * inv_scale);
return(CIELabColor.FromXYZ(xyz));
}
/**
* Calculate the euclidean distance between two Cie-Lab colors (DeltaE).
* http://www.easyrgb.com/index.php?X=DELT&H=03#text3
*/
/// <summary>
/// Calculate the euclidean distance between two Cie-Lab colors (DeltaE).
/// </summary>
/// <param name="lhs">Left Hand Side</param>
/// <param name="rhs">Right Hand Side</param>
/// <returns></returns>
public static float DeltaE(CIELabColor lhs, CIELabColor rhs)
{
return((float)Math.Sqrt(
(float)Math.Pow((lhs.L - rhs.L), 2) +
(float)Math.Pow((lhs.a - rhs.a), 2) +
(float)Math.Pow((lhs.b - rhs.b), 2)));
}
/**
* Get human readable name from a Color.
*/
/// <summary>
/// Get Color Name
/// </summary>
/// <param name="InColor">Set in-color</param>
/// <returns></returns>
public static string GetColorName(Color InColor)
{
CIELabColor lab = CIELabColor.FromRGB(InColor);
string name = "Unknown";
float diff = (float)double.PositiveInfinity;
foreach (KeyValuePair <string, CIELabColor> kvp in ColorNameLookup)
{
float dist = (float)Math.Abs(DeltaE(lab, kvp.Value));
if (dist < diff)
{
diff = dist;
name = kvp.Key;
}
}
return(name);
}
