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#!/bin/bash
# pdf2png
#
# Rasterizes a PDF file, saving as a set of binary png images
#
# input: PDF
# root name of output files
# output: png binary files for each page
#
# Note 1: Requires ghostscript
#
# Note 2: A modern alternative to ghostcript is to use poplar:
# If the pdf is composed of images that were orthographically generated:
# pdftoppm -png <pdf-file> <pdf-root> [output in png]
# If the pdf is composed of images that were scanned:
# pdftoppm -jpeg <pdf-file> <pdf-root> [output in jpeg]
scriptname=${0##*/}
if test $# != 2
then
echo "usage: " $scriptname " inpdffile outpngroot"
exit -1
fi
inpdffile=$1
outpngroot=$2
# strip off directory and suffix parts of $1 to use in other names
basename=${1##*/}
baseroot=${basename%.*}
# make names for temporary files
tmppdffile=${baseroot}.$$_.pdf
tmppdfroot=${tmppdffile%.*}
# have the temporary files deleted on exit, interrupt, etc:
trap "/bin/rm -f ${tmppdfroot}*" EXIT SIGHUP SIGINT SIGTERM
cp $inpdffile $tmppdffile
# need mysterious "primer"
#echo "0 neg 0 neg" translate | gs -sDEVICE=pngmono -sOutputFile=${outpngroot}%03d.png -r300x300 -q - ${tmppdffile}
echo "0 neg 0 neg" translate | gs -sDEVICE=pngmono -sOutputFile=${outpngroot}%03d.png -g2550x3300 -r300x300 -q - ${tmppdffile}
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