Comparision for large documents #45

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1. patrislav1 commented on Jun 25, 2025

   

   patrislav1

   on Jun 25, 2025

   Last edited by patrislav1

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   I created a small script to deal with comparison of big documents, making pdf-diff work on each page individually.

   #!/bin/bash
   
   set -eu
   
   FILE1="file1.pdf"
   FILE2="file2.pdf"
   
   PAGES1=$(pdfinfo "${FILE1}" | awk '/Pages:/ {print $2}')
   PAGES2=$(pdfinfo "${FILE2}" | awk '/Pages:/ {print $2}')
   
   echo PAGES1=${PAGES1} PAGES2=${PAGES2}
   
   PAGES=${PAGES1}
   
   mkdir -p pages1 pages2 diffresult
   
   if [ -z "$(ls -A pages1)" ]; then
     pdfseparate "${FILE1}" pages1/page-%03d.pdf
     pdfseparate "${FILE2}" pages2/page-%03d.pdf
   fi
   
   rm -rf diffresult/*
   for i in $(seq -f "%03g" 1 $PAGES); do
     echo processing page $i
     FNAME="diffresult/page-${i}.png"
     pdf-diff pages1/page-${i}.pdf pages2/page-${i}.pdf -s underline,underline -r 2000 > ${FNAME} || true
     # Remove empty (non-diff) pages
     [ ! -s ${FNAME} ] && rm ${FNAME}
   done