public static void RgbToLab(BitmapWrapper input, BitmapWrapper outL, BitmapWrapper outA, BitmapWrapper outB, LabSettings s)
{
//create conversion matrix
Func <Chromacity, (float, float, float)> getCoordinaes = c => (c.X / c.Y, 1, (1 - c.X - c.Y) / c.Y);
(float Xr, float Yr, float Zr) = getCoordinaes(s.RedPrimary);
(float Xg, float Yg, float Zg) = getCoordinaes(s.GreenPrimary);
(float Xb, float Yb, float Zb) = getCoordinaes(s.BluePrimary);
(float Xw, float Yw, float Zw) = getCoordinaes(s.WhitePoint);
float[,] sMatrix = new float[3, 3] {
{ Xr, Xg, Xb },
{ Yr, Yg, Yb },
{ Zr, Zg, Zb }
};
InverseMatrix3(sMatrix);
float[] SrSgSb = Matrix3TimesVector(sMatrix, new float[] { Xw, Yw, Zw });
float Sr = SrSgSb[0];
float Sg = SrSgSb[1];
float Sb = SrSgSb[2];
float[,] M = new float[3, 3] {
{ Sr *Xr, Sg *Xg, Sb *Xb },
{ Sr *Yr, Sg *Yg, Sb *Yb },
{ Sr *Zr, Sg *Zg, Sb *Zb }
};
//transform
var size = input.GetSize();
Parallel.For(0, size.Height, h => {
for (int x = 0; x < size.Width; x++)
{
(float L, float a, float b) = RgbToLab(input.GetPixel(x, h), M, new float[3] {
Xw, Yw, Zw
}, s.Gamma);
int li = (int)(L / 100f * 255f);
int ai = (int)(a * 128f / 100f) + 127;
int bi = (int)(b * 128f / 100f) + 127;
li = ClampColorInt(li);
ai = ClampColorInt(ai);
bi = ClampColorInt(bi);
outL.SetPixel(x, h, Color.FromArgb(li, li, li));
outA.SetPixel(x, h, Color.FromArgb(ai, 255 - ai, 127));
outB.SetPixel(x, h, Color.FromArgb(bi, 127, 255 - bi));
}
});
}
private void separateButton_Click(object sender, EventArgs e)
{
if (inputBitmap == null)
{
MessageBox.Show("No input bitmap!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
var size = inputBitmap.GetSize();
outputBitmaps = new BitmapWrapper[3];
for (int i = 0; i < 3; i++)
{
outputBitmaps[i] = new BitmapWrapper(size.Width, size.Height);
}
Cursor.Current = Cursors.WaitCursor;
try
{
if (variables.ColorRepresentation == ColorRepresentation.HSV)
{
Transforms.RgbToHsv(inputBitmap, outputBitmaps[0], outputBitmaps[1], outputBitmaps[2]);
}
else if (variables.ColorRepresentation == ColorRepresentation.YCbCr)
{
Transforms.RgbToYCbCr(inputBitmap, outputBitmaps[0], outputBitmaps[1], outputBitmaps[2]);
}
else if (variables.ColorRepresentation == ColorRepresentation.Lab)
{
//get lab settings
var labSettings = new LabSettings
{
RedPrimary = new Chromacity((float)redPrimaryX.Value, (float)redPrimaryY.Value),
GreenPrimary = new Chromacity((float)greenPrimaryX.Value, (float)greenPrimaryY.Value),
BluePrimary = new Chromacity((float)bluePrimaryX.Value, (float)bluePrimaryY.Value),
WhitePoint = new Chromacity((float)whitePointX.Value, (float)whitePointY.Value),
Gamma = (float)gamma.Value
};
Transforms.RgbToLab(inputBitmap, outputBitmaps[0], outputBitmaps[1], outputBitmaps[2], labSettings);
}
}
catch (Exception ex)
{
Cursor.Current = Cursors.Default;
MessageBox.Show("Error while transforming! \n" + ex.Message, "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
output1.BackgroundImage = outputBitmaps[0].ToBitmap();
output2.BackgroundImage = outputBitmaps[1].ToBitmap();
output3.BackgroundImage = outputBitmaps[2].ToBitmap();
var outLabels = variables.GetRepresentationLabels();
out1box.Text = outLabels[0];
out2box.Text = outLabels[1];
out3box.Text = outLabels[2];
GC.Collect();
Cursor.Current = Cursors.Default;
}