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var dest,source: Trect;
  jpeg: TJPEGImage;
  bmp:  TBitmap;
begin
 
//SCHRITT 1
  jpeg := TJPEGImage.Create;
  jpeg.CompressionQuality := 100; {Default Value}
  jpeg.LoadFromFile(Listbox1.Items[Listbox1.ItemIndex]);
  bmp := TBitmap.Create;
  bmp.Assign(jpeg);

//SCHRITT 2
  dest.TopLeft.X := 0;
  dest.TopLeft.Y := 0;
  dest.BottomRight.x := 419;
  dest.BottomRight.Y := 306;
  source.TopLeft.X := 31;
  source.TopLeft.Y := 71;
  source.BottomRight.x := 450;
  source.BottomRight.Y := 377;
  image2.Picture.Bitmap :=bmp; 
  image1.Canvas.CopyRect(dest,Image2.canvas,source);
  image1.Canvas.Refresh;

//SCHRITT 3
  jpeg := TJPEGImage.Create;
  jpeg.CompressionQuality := 100; {Default Value}
  jpeg.Assign(image1.Picture.Graphic);
  jpeg.SaveToFile(Listbox1.Items[Listbox1.ItemIndex]);
  bmp.Free;
  jpeg.Free;
end;