procedure TForm11.Button4Click(Sender: TObject);
var
  PNG: TIEPNGImage;
  ms: TMemoryStream;
begin
  PNG := TIEPNGImage.Create;
  ms := TMemoryStream.Create;
  try
    ms.LoadFromFile('111.png');
    PNG.LoadFromStream(ms);        <<< 1st error
    PNG.SaveToFile('222.png');     <<< 2nd error
  finally
    PNG.Free;
    ms.Free;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
// Load a png file into TMemoryStream and save the png file with a new name
var
  iPNG: TIEPNGImage;
  ims: TMemoryStream;
begin
  iPNG := TIEPNGImage.Create;
  try
    ims := TMemoryStream.Create;
    try
      ims.LoadFromFile('111.png');
      ims.Position := 0; // Add this
      iPNG.LoadFromStream(ims);
      iPNG.SaveToFile('222.png');
    finally
      ims.Free;
    end;
  finally
   iPNG.Free;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
// Load a png file into TMemoryStream and save the png file with a new name
var
  iPNG: TIEPNGImage;
  ims: TMemoryStream;
begin
  iPNG := TIEPNGImage.Create;
  try
    ims := TMemoryStream.Create;
    try
      ims.LoadFromFile('111.png');
      ims.Position := 0; // Add this
      iPNG.LoadFromStream(ms);
      iPNG.SaveToFile('222.png');
    finally
      ims.Free;
    end;
  finally
   iPNG.Free;
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
// Load a png file into a TMemoryStream then save the png to a file with a new filename
var
  ms: TMemoryStream;
begin
  ms := TMemoryStream.Create;
  try
    ms.LoadFromFile('111.png');
    ms.Position := 0;
    ms.SaveToFile('222.png');
  finally
    ms.Free;
  end;
end;

procedure TForm1.Button3Click(Sender: TObject);
// Load a png file into a TMemory stream, then use imageenio to load the stream and save the png file
var
  iImageEnIO: TImageENIO;
  ims: TMemoryStream;
begin
  iImageEnIO := TImageENIO.Create(nil);
  try
    ims := TMemoryStream.Create;
    try
      ims.LoadFromFile('111.png');
      ims.Position := 0;
      iImageEnIO.LoadFromStreamPNG(ims);
      iImageEnIO.SaveToFilePNG('222.png');
    finally
      ims.Free;
    end;
  finally
   iImageEnIO.Free;
  end;
end;

procedure TForm1.Button4Click(Sender: TObject);
// Load a png file into a TMemory stream, then load the stream into ImageEnView, and use ImageEnView.IO to save the png file with a new name
var
  ims: TMemoryStream;
begin
  ims := TMemoryStream.Create;
  try
    ims.LoadFromFile('111.png');
    ims.Position := 0;
    ImageEnView1.IO.LoadFromStreamPNG(ims);
    ImageEnView1.Update;
    ImageEnView1.IO.SaveToFilePNG('222.png');
  finally
     ims.Free;
  end;
end;