minimize PDF with JPG compressing

pdf-unlock-minimize.sh

#!/bin/bash

# pdf-unlock-minimize.sh  <- base dir is where this script is, you must run this from here
# |- pdf/
# |  \- 01.pdf, 02.pdf,...  <- put PDFs you want to minimize, then run this script
# |- dec/  <- decrypted PDFs
# |- jpgs/
# |  \- 01/  <- compressed JPGs from raw/
# |     \- raw/  <- displayed raw JPGs
# |  \- 02/
# |  ...
# \- mini/  <- minimized PDFs (you wanted to get)

PASSWORD="********"

mkdir -p dec mini

for i in pdf/*.pdf; do
  PDFFILE=$(basename ${i})
  PDFNUM=${PDFFILE%.pdf}
  if [ -e mini/${PDFNUM}_mini.pdf ]; then
    continue
  fi

  mkdir -p jpgs/${PDFNUM}/raw
  
  qpdf --decrypt --password=${PASSWORD} ${i} dec/${PDFNUM}_dec.pdf

  convert dec/${PDFNUM}_dec.pdf jpgs/${PDFNUM}/raw/${PDFNUM}-dest.jpg

  for j in jpgs/${PDFNUM}/raw/${PDFNUM}-dest-*.jpg; do
    JPGFILE=$(basename ${j})
    JPGDIR=$(dirname ${j})
    convert -resize 600x -unsharp 2x1.4+0.5+0 -colors 65 -quality 100 -verbose ${JPGDIR}/${JPGFILE} ${JPGDIR%raw}${JPGFILE}
  done

  convert ${JPGDIR%raw}*.jpg mini/${PDFNUM}_mini.pdf
done