batch-convert-arw-files.sh

#!/usr/bin/env bash

# Batch Convert ARW Files
# Use this script to batch-convert ARW files into (for example) JPEG files for use
# as lower quality thumbnails.
#
# What it does:
# 
# 1. Find all ARW files on the local machine
# 2. Pipe into the parallel command (sudo apt-get install -y parallel)
# 3. Run at 70% available CPU
# 4. Invoke rawtherapee-cli for each file (sudo apt-get install -y rawtherapee)
# 5. Output to thumbs dir
#    -q    => quick start
#    -j40  => 40% quality jpeg output
#    -Y    => overwrite file if present
#    -c    => specify input file

mkdir -p thumbs
ls *.ARW | parallel --jobs 70% rawtherapee-cli -o "thumbs/{1}.png" -q -j40 -Y -c "{1}"