I just did a new release of my simple ImageMagick-wielding gallery generator shell script, simgal. It hasn't been touched since 2011 but I use it myself and thought it more or less working, but apparently I haven't used it with JPEG comments for a while...
Embarrasingly I discovered that there was a bug that only showed the
first word of any JFIF comment in a JPEG file instead of the entire
comment! A case of
print $3 versus
print substr($0, index($0,$3)),