Study Guide: Converting files in HEIC format to JPEG format
How to convert those pesky HEIC files into JPEG format.
Installation
Install https://imagemagick.org/. For MacOS with homebrew installed:
$ brew install imagemagick
File Conversion
Using your favorite terminal app (such as iTerm), navigate to the directory containing those pesky HEIC files, and convert ’em all with the following command. (Note: iPhone saves the file extension in all caps.)
$ magick mogrify -format jpg *.HEIC
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Source: https://class.ronliskey.com/study/computing/heic-format-converting/