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use strict; use warnings;
use Image::MetaData::JPEG;
...
$hexdumper->file($new_file_name);
$hexdumper->block_size(1024);
print while $_ = $hexdumper->dump;

FF E1                 SOI ("Start of image")
FF E0                 APP0 segment starts here
...
FF FE                 COM segment starts here
00 13                 length of COM (19, i.e. 17 to follow)
.........             "Created with GIMP", and so on