Debian README for llgal package
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llgal recommends libimage-exiftool-perl. It does not depend on it
since most usages won't actually need it.

libimage-exiftool-perl provides extraction of tags from images,
including Exif tags (used when llgal is passed --exif) and basic
comments and timestamps (used when --cc or --ct is passed).

When none of these features are used, llgal may safely be used
without libimage-exiftool-perl installed. If those feature are
used, llgal will fail gracefully and advice the user to install
libimage-exiftool-perl.