protected override Pixel QuantizatePixel(int x, int y)
{
// Get nearest color from palette
int colorIndex = nearestNeighbour.Search(labImg[y, x]);
// Apply dithering algorithm for each channel
LabColor oldPixel = labImg[y, x];
LabColor newPixel = labPalette[colorIndex];
this.Dithering.ApplyDithering(labImg.Data, x, y, 0, oldPixel.X - newPixel.X);
this.Dithering.ApplyDithering(labImg.Data, x, y, 1, oldPixel.Y - newPixel.Y);
this.Dithering.ApplyDithering(labImg.Data, x, y, 2, oldPixel.Z - newPixel.Z);
// If it's a transparent color, set the first palette color
Color rgbColor = this.rgbImg[y, x];
if (rgbColor.Alpha == 0)
{
return(new Pixel(0, 0, true));
}
else
{
return(new Pixel((uint)colorIndex, (uint)rgbColor.Alpha, true));
}
}
protected override Pixel QuantizatePixel(int x, int y)
{
// Get the color and add to the list
Color color = image[y, x];
int colorIndex;
if (listColor.Count < this.MaxColors)
{
if (!listColor.Contains(color))
{
listColor.Add(color);
}
colorIndex = listColor.IndexOf(color);
}
else
{
// Create the labpalette if so
if (nearestNeighbour == null)
{
LabColor[] labPalette = ColorConversion.ToLabPalette <Color>(listColor.ToArray());
nearestNeighbour = new ExhaustivePaletteSearch();
nearestNeighbour.Initialize(labPalette);
}
LabColor labNoTrans = ColorConversion.ToLabPalette <Color>(new Color[] { color })[0];
colorIndex = nearestNeighbour.Search(labNoTrans);
}
return(new Pixel((uint)colorIndex, (uint)color.Alpha, true));
}