This was in the tree at least from 2005 (possibly before) up until about five years ago when it suddenly disappeared (and I can't seem to find the reason it did).
Why this is useful (1):
Why this is useful (2):
It is one of the very few programs available for linux that supports .heic (HEVC).
Here is reason why it was removed
# Pacho Ramos <email@example.com> (28 Dec 2017)
# A major version bump is needed (#412447), fails with multilib-strict
# (#613542), not compatible with newer imagemagick (#619514), cannot be
# downloaded (#635566). Removal in a month.
Please have a look at these ebuilds
test, report and improve them.
I suggest to work hand in hand with the overlay maintainer at first.
As soon as someone provides a clean ebuild and wants to maintain it, we can reintroduce it to the tree.