bug#51381: HEIF image format support

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Stefan Kangas <stefan@marxist.se>,  51381@debbugs.gnu.org
> Date: Fri, 29 Oct 2021 14:35:20 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Why do we prefer external-converter for this, instead of having those
> > images supported natively?  I thought we wanted to move away of
> > ImageMagick dependencies?
> 
> We don't want to make Emacs depend on All The C Image Libraries That
> Exist.  For obscure formats, seldom used, it's fine to use an external
> program (if the user wants to).

Is HEIF an "obscure format"?