public static Lab LCHToLab(LCH lch)
{
return(new Lab
{
L = lch.L,
A = lch.C * Math.Cos(lch.H),
B = lch.C * Math.Sin(lch.H)
});
}
public static LCH[,] RGBToLch(Bitmap image)
{
var width = image.Width;
var height = image.Height;
var resultXYZ = new XYZ[width, height];
for (var i = 0; i < width; ++i)
{
for (var j = 0; j < height; ++j)
{
resultXYZ[i, j] = XYZ.XyzFromColor(image.GetPixel(i, j));
}
}
var resultLab = new Lab[width, height];
for (var i = 0; i < width; ++i)
{
for (var j = 0; j < height; ++j)
{
resultLab[i, j] = Lab.LabFromXYZ(resultXYZ[i, j]);
}
}
var resultLhc = new LCH[width, height];
for (var i = 0; i < width; ++i)
{
for (var j = 0; j < height; ++j)
{
resultLhc[i, j] = new LCH
{
L = resultLab[i, j].L,
C = Math.Sqrt(Math.Pow(resultLab[i, j].A, 2) + Math.Pow(resultLab[i, j].B, 2)),
H = resultLab[i, j].A / resultLab[i, j].B > 0 ? Math.Atan(resultLab[i, j].A / resultLab[i, j].B) :
Math.Atan(resultLab[i, j].A / resultLab[i, j].B) + 360
};
}
}
return(resultLhc);
}