How can I convert an HEIF/HEIC image into a JPEG? Maybe using ImageMagick?
Support for reading HEIF was added to ImageMagick 7.0.7-22, you have to install it with
e.g. on macOS with Homebrew:
brew install imagemagick --with-libheif. If you have previously installed imagemagick with Homebrew, you need to uninstall it by
brew uninstall imagemagick first.
One other option to convert HEIF → JPG on macOS is by using Automator. It has a "Change Type of Images" action that can do the conversion. If needed, you could have the "to JPG" conversion available in context menu
@filibuntu has written about HEIF software on AskUbuntu. The information likely applies to other Linux distributions as well.
There is a library
libheifthat is part of the standard Ubuntu repositories, but no other packages use it at this time.
There is a package
libheif-tool, but it can be installed only via PPA.
The latest version of GIMP (2.10.2+) supports import and export of HEIF files.
tifigmay do what you are seeking, but I have not tried it.
Apparently, Imagemagick can be recompiled with
libheifsupport, though I haven't tried.
Windows 10 Build 17623 includes support for HEIF in the Photos app.
The following may need to be installed:
Google Photos and Dropbox have been reported to support HEIF.
There are other converters, but be sure to read their privacy policies before using them.