ImageEnView1.MouseInteract := [miSelectCircle];

ImageEnView1.Proc.CopyToClipboard(iecpAuto);

procedure TForm1.Button1Click(Sender: TObject);
var
  iIEBitmap: TIEBitmap;
  iIOParams: TIOParams;
begin
  iIEBitmap := TIEBitmap.Create;
  try
    if iIEBitmap.PasteFromClipboard then
    begin
      iIOParams := TIOParams.Create();
      try
        iIOParams.BitsPerSample := 8;
        iIOParams.SamplesPerPixel := 4;
        iIEBitmap.AlphaChannel;
        iIEBitmap.Write(DesktopFolder +'testimage.png', iIOParams);
      finally
        iIOParams.Free;
      end;
    end;
  finally
    iIEBitmap.Free;
  end;
end;

if ImageEnView1.EnableAlphaChannel then
  ImageEnView1.IEBitmap.AlphaChannel;
ImageEnView1.Proc.CopyToClipboard;

procedure TFormMain.mPasteImageClick(Sender: TObject);
var
  ThisImage: TIEBitmap;
begin
  ThisImage := TIEBitmap.Create;
  try
    if ThisImage.PasteFromClipboard then          
      ThisImage.Write('R:\testimage.png');    
  finally
    ThisImage.Free;
  end;
end;

If ImageEnView1.EnableAlphaChannel then
  ImageEnView1.IEBitmap.AlphaChannel;

procedure TForm1.Copy1Click(Sender: TObject);
var
  iRGB: TRGB;
  i: integer;
begin
  if (SelectEllipse1.Down) and (ImageEnView1.Selected) then
  begin
    { Save original image to restore after copy }
    ImageEnView1.Proc.SaveUndo('Copy Ellipse');
    { Invert the selection to set the transparency }
    ImageEnView1.InvertSelection;
    { Fill the selection with black }
    ImageEnView1.Proc.Fill(clBlack);
    { Remove the selection }
    ImageEnView1.DeSelect;
    { Render the trancparency }
    iRGB := TColor2TRGB(clBlack);
    { Set the transparency- make the black transparent }
    ImageEnView1.Proc.SetTransparentColors(iRGB, iRGB, 0);
    ImageEnView1.BackgroundStyle := iebsChessboard;
    ImageEnView1.IO.Params.BitsPerSample := 8;
    ImageEnView1.IO.Params.SamplesPerPixel := 4;
    { Copy to the clipboard }
    ImageEnView1.Proc.CopyToClipboard();
    { Restore the original image }
    for i := 0 to ImageEnView1.Proc.UndoCount-1 do
      ImageEnView1.Proc.UndoAt(i);
    ImageEnView1.Proc.ClearAllUndo;
    ImageEnView1.Update;
    Undo1.Enabled := ImageEnView1.Proc.CanUndo;
  end
  else
  begin
    ImageEnView1.Proc.CopyToClipboard();
  end;
end;

procedure TForm1.Paste1Click(Sender: TObject);
begin
  ImageEnView2.Proc.PasteFromClipboard();
  ImageEnView2.Update;
end;