[Format]PNG

[           8 bytes            ]
 89  50  4D  47  0D  0A  1A  0A
 89  "P   N   G  \r  \n  空  \n"
[   4 bytes    ][   4 bytes    ]
 00  00  00  0D  49  48  44  52
 00  00  00  0D  "I   H   D   R"
[   4 bytes    ][   4 bytes    ][     5 bytes      ]
      width          height     bitDepth/colorType/compressionMethod/filterMethod/interlaceMethod

{                                  
[   4 bytes    ][   4 bytes    ]
  data length     chunk type
[                 n bytes chunk data                 ...]
  chunk data
[   4 bytes    ]
 CRC for chunk data
}*

[   4 bytes    ][   4 bytes    ][   4 bytes    ]
 00  00  00  00  49  45  4E  44  AE  42  60  82
 00  00  00  00  "I   E   N   D" AE  42  60  82