gistfile1.sh

#!/bin/bash

DEVICE=$(scanimage -f "%d%n" | grep epjitsu)

while true; do
    rm out*.pnm 2> /dev/null
    TIMESTAMP=$(date +%Y%m%d%H%M%S)
    scanimage -d $DEVICE --mode Lineart --resolution 300 --source "ADF Duplex" -b 2> /dev/null
    if [ -f out1.pnm ]; then
        for file in out*.pnm; do
            unpaper -dv 5 -ni 15 --dpi 300 -mt 0.05 --overwrite $file $file
            convert $file -fuzz 15% -trim -shave 1%x1% -fuzz 15% -trim $file
            identify $file | grep 1x1 && rm $file
        done
        convert -page 2480x3508 -gravity center out*.pnm $TIMESTAMP.pdf
        rm out*.pnm
    fi
done