/// <summary>
/// Gets a string key that identifies this particular Lut's characteristics, so that
/// an image's <see cref="IComposedLut"/> can be more efficiently determined.
/// </summary>
/// <remarks>
/// This method is not to be confused with <b>equality</b>, since some Luts can be
/// dependent upon the actual image to which it belongs.
/// </remarks>
public override string GetKey()
{
return(String.Format("{0}:{1}", _dataLut.GetKey(), _linearLut.GetKey()));
}
