Source: https://coderwall.com/p/nhp7mq/convert-raw-photos-to-jpg-in-the-mac-os-terminal
No need for slow and heavy Photoshop scripts for this one, you can do easily do this right from your terminal window.
This is possible using "sips", an image editing tool already available on Mac which allows you to do all sorts of image manipulation, including resizing and converting.
So we first grab all RAW files in a folder, We convert them to jpeg (or any other format), And we output them somewhere else.
for i in *.CR2; do sips -s format jpeg $i --out "${i%.*}.jpg"; done
You could also specify a different folder (but it has to exist in advance)
for i in *.CR2; do sips -s format jpeg $i --out "/tmp/my_images/${i%.*}.jpg"; done
I am currently checking the quality of the output jpeg files
EDIT: The picture quality that I get is way better than the one obtained with LibRaw and rawpy or rawkit, being rawpy the worst.
thanks a lot! it's really helpful. (I tried using .ARW files and worked well