$ hexdump --canonical foo.png 
00000000  89 50 4e 47 0d 0a 1a 0a  00 00 00 0d 49 48 44 52  |.PNG........IHDR|
00000010  00 00 00 01 00 00 00 01  01 00 00 00 00 37 6e f9  |.............7n.|
00000020  24 00 00 00 04 67 41 4d  41 00 00 b1 8f 0b fc 61  |$....gAMA......a|
00000030  05 00 00 00 20 63 48 52  4d 00 00 7a 26 00 00 80  |.... cHRM..z&...|
00000040  84 00 00 fa 00 00 00 80  e8 00 00 75 30 00 00 ea  |...........u0...|
00000050  60 00 00 3a 98 00 00 17  70 9c ba 51 3c 00 00 00  |`..:....p..Q<...|
00000060  02 62 4b 47 44 00 01 dd  8a 13 a4 00 00 00 07 74  |.bKGD..........t|
00000070  49 4d 45 07 e3 07 1a 08  39 35 87 a4 b0 46 00 00  |IME.....95...F..|
00000080  00 0a 49 44 41 54 08 d7  63 60 00 00 00 02 00 01  |..IDAT..c`......|
00000090  e2 21 bc 33 00 00 00 25  74 45 58 74 64 61 74 65  |.!.3...%tEXtdate|
000000a0  3a 63 72 65 61 74 65 00  32 30 31 39 2d 30 37 2d  |:create.2019-07-|
000000b0  32 35 54 32 30 3a 35 37  3a 35 33 2b 31 32 3a 30  |25T20:57:53+12:0|
000000c0  30 ac cd 5d c1 00 00 00  25 74 45 58 74 64 61 74  |0..]....%tEXtdat|
000000d0  65 3a 6d 6f 64 69 66 79  00 32 30 31 39 2d 30 37  |e:modify.2019-07|
000000e0  2d 32 35 54 32 30 3a 35  37 3a 35 33 2b 31 32 3a  |-25T20:57:53+12:|
000000f0  30 30 dd 90 e5 7d 00 00  00 00 49 45 4e 44 ae 42  |00...}....IEND.B|
00000100  60 82                                             |`.|
00000102