If you’ve ever been stuck with a directory of .DNG or .RAW files this script will quickly convert the images for you.
Adobe Products may give a better result but seem to be one at a time still…
for i in *.dng; do sips -s format jpeg $i --out "${i%.*}.jpg"; done
Reference: https://coderwall.com/p/nhp7mq/convert-raw-photos-to-jpg-in-the-mac-os-terminal