Convert optimize resize multiple images through bash script

bulk-image-process.sh

# USAGE
# bash bulk-image-process.sh [path/to/images]
# current exec folder is used as destination

destination_dir=$(pwd)
source_dir=$1

for photo in $source_dir/*.jpg;

do

lowercase_path=${photo,,}
filename=$(basename $lowercase_path)
destinationpath="${destination_dir}/converted-${filename}"

convert \
  -verbose \
  "$photo" \
  -quality 75% \
  -resize 800x600 \
  -background white \
  -gravity center \
  -extent 800x600 \
  -transparent white \
  "${destinationpath}";

done

## REQUIREMENT
# check if you have ImageMagick installed with
# convert --version