ans = 74x1 cell
    {'SubFileType'        }
    {'ImageWidth'         }
    {'ImageLength'        }
    {'BitsPerSample'      }
    {'Compression'        }
    {'Photometric'        }
    {'Thresholding'       }
    {'FillOrder'          }
    {'DocumentName'       }
    {'ImageDescription'   }
    {'Make'               }
    {'Model'              }
    {'StripOffsets'       }
    {'Orientation'        }
    {'SamplesPerPixel'    }
    {'RowsPerStrip'       }
    {'StripByteCounts'    }
    {'MinSampleValue'     }
    {'MaxSampleValue'     }
    {'XResolution'        }
    {'YResolution'        }
    {'PlanarConfiguration'}
    {'PageName'           }
    {'XPosition'          }
    {'YPosition'          }
    {'Group3Options'      }
    {'Group4Options'      }
    {'ResolutionUnit'     }
    {'PageNumber'         }
    {'TransferFunction'   }
      ⋮