Increases (AIncrement = True) or decreases the current image scale using predefined set of scale values.
The minimal value in this set is 7, and the maximal is 1600.

Updates internal image info fields.
Must be called after you load a new image.
The typical image load procedure can look like this:

  procedure TFormMain.LoadImage(const AFileName: string);
  begin
    try
      try
        ATImageBox1.Image.Resample := True;
        ATImageBox1.Image.ResampleBackColor := ATImageBox1.Color;
        ATImageBox1.Image.Picture.LoadFromFile(AFileName);
      finally
        ATImageBox1.UpdateImageInfo;
      end;
    except
      Application.MessageBox('Could not load image', 'Error',
        MB_OK or MB_ICONERROR);
    end;
  end;