m = struct with fields:
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                  FileModDate: '16-Mar-2015 09:57:26'
                     FileSize: 892828
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                    ColorType: 'R,G,B'
              FormatSignature: [88 80 68 83]
                    ByteOrder: 'Little-endian'
                  Orientation: 'Left-to-right, Top-to-bottom'
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                     DataSign: {'Unsigned'}
    AmplitudeTransferFunction: {'ITU-R 709-4'}
                  Colorimetry: {'ITU-R 709-4'}
             ChannelBitDepths: 12
                PackingMethod: 0
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