public static IEnumerable <ColorCount> ListAllColorsByMostCommon(Bitmap bitmap)
{
Dictionary <Color, long> colors = new Dictionary <Color, long>();
using (DisposableBitmapData bmpData = bitmap.LockRead(PixelFormat.Format24bppRgb)) {
BitmapData data = bmpData;
foreach (PixelPoint p in data.ForEachPixel())
{
Color color = p.Color;
if (colors.TryGetValue(color, out long count))
{
colors[color] = count + 1;
}
else
{
colors.Add(color, 1);
}
}
}
return(colors.OrderByDescending(x => x.Value).Select(p => (ColorCount)p)); //.Select(p => p.Key);
}