internal static IRgb ToColor(ILch item)
{
var hRadians = item.H * Math.PI / 180.0;
var lab = new Lab
{
L = item.L,
A = Math.Cos(hRadians) * item.C,
B = Math.Sin(hRadians) * item.C
};
return(lab.To <Rgb>());
}
private bool Max_range(Lab labPixel, Lab labBefore, int treshold, ref Lab labRange)
{
if (Math.Abs(labPixel.L - labBefore.L) < treshold)
{
labRange.L = labPixel.L - labBefore.L;
}
if (Math.Abs(labPixel.A - labBefore.A) < treshold)
{
labRange.A = labPixel.A - labBefore.A;
}
if (Math.Abs(labPixel.B - labBefore.B) < treshold)
{
labRange.B = labPixel.B - labBefore.B;
}
var evklidRange = Math.Sqrt((labPixel.L - labBefore.L) * (labPixel.L - labBefore.L) +
(labPixel.A - labBefore.A) * (labPixel.A - labBefore.A) +
(labPixel.B - labBefore.B) * (labPixel.B - labBefore.B));
return(evklidRange < treshold);
}
private Image ApplyFilterLab(Image image)
{
_colBefore = pnlSourceColor.BackColor;
_colAfter = pnlResultColor.BackColor;
_treshold = trcThreshHold.Value;
_labBefore = new Rgb {
R = _colBefore.R, G = _colBefore.G, B = _colBefore.B
}.To <Lab>();
_labAfter = new Rgb {
R = _colAfter.R, G = _colAfter.G, B = _colAfter.B
}.To <Lab>();
var img = new Bitmap(image);
for (var i = 0; i < img.Width; i++)
{
for (var j = 0; j < img.Height; j++)
{
_pixel = img.GetPixel(i, j);
_labPixel = (_rgbPixel = new Rgb {
R = _pixel.R, G = _pixel.G, B = _pixel.B
}).To <Lab>();
if (Max_range(_labPixel, _labBefore, _treshold, ref _labRange))
{
_labPixel.L = _labAfter.L + _labRange.L;
_labPixel.A = _labAfter.A + _labRange.A;
_labPixel.B = _labAfter.B + _labRange.B;
_rgbPixel = _labPixel.To <Rgb>();
if (_rgbPixel.R < 0)
{
_rgbPixel.R = 0;
}
if (_rgbPixel.R > 255)
{
_rgbPixel.R = 255;
}
if (_rgbPixel.G < 0)
{
_rgbPixel.G = 0;
}
if (_rgbPixel.G > 255)
{
_rgbPixel.G = 255;
}
if (_rgbPixel.B < 0)
{
_rgbPixel.B = 0;
}
if (_rgbPixel.B > 255)
{
_rgbPixel.B = 255;
}
img.SetPixel(i, j, Color.FromArgb((int)_rgbPixel.R, (int)_rgbPixel.G, (int)_rgbPixel.B));
}
}
}
return(img);
}