procedure Saturation(var  Bitmap: TBitmap; Amount: Integer);
var
Wsk:^TRGBTriple;
Gray,H,V: Integer;
begin
  for V:=0 to Bitmap.Height-1 do
  begin
    Wsk:=Bitmap.ScanLine[V];
    for H:=0 to Bitmap.Width-1 do
    begin

    Gray:=(Wsk.rgbtBlue+Wsk.rgbtGreen+Wsk.rgbtRed)div 3;
    Wsk.rgbtRed:=IntToByte(Gray+(((Wsk.rgbtRed-Gray)*Amount)div 255));
    Wsk.rgbtGreen:=IntToByte(Gray+(((Wsk.rgbtGreen-Gray)*Amount)div 255));
    Wsk.rgbtBlue:=IntToByte(Gray+(((Wsk.rgbtBlue-Gray)*Amount)div 255));
    inc(Wsk);
    end;
  end;
end;