/// <summary>
/// Resets ColourInfo.Frequency fields, and removes colour not present in Colourmap.
/// If Image has N pixels, and ColourMap has M colours, total time = 3M + Nlog(M) ~= N
/// </summary>
public void UpdateColourMapFromImage()
{
if (mOutput == null || ColourMap == null)
{
return;
}
UpdateColourMapFrequency();
IColourInfo[] temp = ColourMap.ToArray();
foreach (IColourInfo col in temp)
{
if (col.Frequency < 1 && !col.IsChecked)
{
ColourMap.RemoveColour(col.Colour);
}
}
}
