Batch resize images with ImageMagick

resize.sh

# place this script in whatever directory you have your albums in
# each album is expected to have an `original` sub-directory where the full-size images actually are
# resized images will be placed in a sibling directory next to `original`

# USAGE
# $ ./resize.sh "2017-09-04 Some Album Name" 1600

# rename arguments
ALBUM=$1 # the name of the directory containing the album (may contain spaces, which is why everything is quoted below)
SIZE=$2 # used to size a bounding box into which images will be resized (aspect ratio will be preserved)

# set globbing to return empty list for empty directories instead of the literal glob pattern
shopt -s nullglob

# create destination directory
mkdir -p "$ALBUM/$SIZE"

# loop over original images, which are expected to be in a sub-directory called `original`
for SOURCE in "$ALBUM/original/"*".JPG"
do
        BASE=`basename "$SOURCE" | sed -e 's/.JPG//'`
        DESTINATION="$ALBUM/$SIZE/${BASE}_$SIZE.JPG"

        # progress report
        echo $DESTINATION

        # actually do the resize
        magick convert "$SOURCE" -resize $SIZEx$SIZE "$DESTINATION"
done