whitening.sh

#!/bin/bash

set -o errexit
set -o pipefail
set -o nounset

trap 'echo "Ctrl-C captured and exit."; exit 1' INT

outdir=$1
if [ "$outdir" == "" ]; then
    outdir=../out/
fi

mkdir -p "$outdir"

for i in $( ls *.jpg ); do
    echo "$i"
    # convert "$i" -level 1%,99%,1.0 -type GrayScale -geometry 1200x -compress jpeg -quality 85 "$outdir/$i"
    convert "$i" -level 20%,80%,1.0 -type GrayScale -geometry 1200x -compress jpeg -quality 85 "$outdir/$i"

    # convert "$i" -level 10%,90%,1.0 -type GrayScale -geometry 1200x -compress jpeg -quality 85 "$outdir/$i"
    # convert "$i" -level 30%,70%,1.0 -type GrayScale -geometry 1200x -compress jpeg -quality 85 "$outdir/$i"
    # convert "$i" -threshold 55000 -depth 4 -geometry 758x1024 -compress jpeg -quality 85 "$outdir/$i"
done