private Func <Tuple <int, int>, Tuple <double, double> > MakeConverter(FractalImageSettings input)
{
var tx = CoordinateTransformer.CreatePixelTransformer(input.PixelWidth, input.PixelHeight, input.OriginX, input.OriginY, input.LogicalWidth);
return((pixPos) => tx.TransformToLocal(pixPos.Item1, pixPos.Item2));
}