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.
libheif-examplescontains command-line utilities:
GIMP and Krita support HEIF via libheif.
Recent Geeqie git commits have added HEIF support. It may be installed from PPA.
Imagemagick can be recompiled with
libheifsupport. There also do not appear to be any pre-built packages for Debian/Ubuntu.
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.