PDF to JPG converter via Ghostscript

converter-pdf2jpg.sh

#!/bin/bash

if command -v gs >/dev/null 2>&1 ; then
    echo "gs found"
else
    echo "GPL Ghostscript not found"
fi

out_pages=$(echo $1 | sed -e "s/\.pdf$/-p%02d\.jpg/g")
out_files=$(echo $1 | sed -e "s/\.pdf$/-p*\.jpg/g")
out_final=$(echo $1 | sed -e "s/\.pdf$/\.jpg/g")

# total_pages=$(gs -q -c "(${1}) (r) file runpdfbegin pdfpagecount = quit" -f $1)

echo "Parameters"
echo 'In($1) = ' $1
echo 'Out($out_pages) = ' $out_pages
echo 'Out($out_final) = ' $out_final
# echo 'TotalPages = ' $total_pages

echo "Parameters - Consts"
DPI=150
ALPHABITS=2
QUALITY=80
FIRSTPAGE=1
LASTPAGE=99
# MEMORY in MB
MEMORY=10

# echo 'DPI: ' $DPI
# echo 'ALPHABITS: ' $ALPHABITS
# echo 'QUALITY: ' $QUALITY
# echo 'FIRSTPAGE: ' $FIRSTPAGE
# echo 'LASTPAGE: ' $LASTPAGE
# echo 'MEMORY: ' $MEMORY

gs \
-sDEVICE=jpeg \
-sOutputFile=$out_pages \
-r${DPI} \
-dNOPAUSE \
-dFirstPage=${FIRSTPAGE} \
-dLastPage=${LASTPAGE} \
-dJPEGQ=${QUALITY} \
-dGraphicsAlphaBits=${ALPHABITS}  \
-dTextAlphaBits=${ALPHABITS}  \
-dNumRenderingThreads=4 \
-dBufferSpace=${MEMORY}000000  \
-dBandBufferSpace=${MEMORY}000000 \
-c ${MEMORY}000000 setvmthreshold \
-f $1 \
-c quit

montage \
-border 0  \
-tile 1x0  \
-quality 100 -geometry 595x842+11+22 \
$out_files  \
$out_final

rm -f ${out_files}

Example:

./converter-pdf2jpg.sh ./test.pdf