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#!/bin/bash
# Resizes files to A4 (or other size - change PaperWdthMetr and PaperHghtMetr below) and merges into a PDF
# by Mikher and user173283 on StackExchange
# https://unix.stackexchange.com/questions/20026/convert-images-to-pdf-how-to-make-pdf-pages-same-size
export LOCALE=C
[[ "${2}x" == "x" ]] && \
{ echo "Usage: $( basename $0 ) output.pdf extension"
echo " merges all files (*.extension) into a single PDF"
echo "If files z_merged.pdf, z_temp.pdf or $1 exist, they will be overwritten"
exit 1
} || \
OutName="$1"
ext="$2"
# Set basic variables
unset Debug #; Debug="yes" # print extra messages
IMBackground="white" # what colour for paper
IMQuality="91" # JPEG compression level
PaperHghtMetr="279.4" # milimeters, 297 for ISO A4
PaperWdthMetr="215.9" # milimeters, 210 for ISO A4
PaperDens="300" # maximum (wanted) dpi for a page
PaperHInch=$( echo scale=5\; $PaperHghtMetr / 2.54 / 10 | bc -l ) # Inch
PaperWInch=$( echo scale=5\; $PaperWdthMetr / 2.54 / 10 | bc -l ) # Inch
PaperRtio=$( echo scale=5\; $PaperWdthMetr / $PaperHghtMetr | bc -l )
# Remove temporary files from prior run
rm -rf z_merged.pdf z_temp.pdf 2>/dev/null
# Process any $ext file in the current directory
find . -maxdepth 1 -name "*.${ext}" -print0 | sort -z | while read -d '' -r FName
do
echo "Converting $FName"
ImgIdentify=$( identify -format "%w %h" "$FName" )
ImgWdthOrig=$( echo $ImgIdentify | cut -d" " -f1 )
ImgHghtOrig=$( echo $ImgIdentify | cut -d" " -f2 )
ImgRtio=$( echo "scale=5; $ImgWdthOrig / $ImgHghtOrig" | bc -l )
# Match output page layout - Landscape or Portrait - to input file
if (( $(echo "$ImgRtio > 1 && $PaperRtio > 1 || $ImgRtio < 1 && $PaperRtio < 1" |bc -l) )); then
echo "Portrait"
PaperHghtInch=$PaperHInch
PaperWdthInch=$PaperWInch
else
echo "Landscape"
PaperHghtInch=$PaperWInch
PaperWdthInch=$PaperHInch
fi
[[ $( echo $ImgRtio'>'$PaperRtio | bc -l ) == 1 ]] \
&& ImgDens=$( echo scale=0\; $ImgWdthOrig / $PaperWdthInch | bc -l ) \
|| ImgDens=$( echo scale=0\; $ImgHghtOrig / $PaperHghtInch | bc -l )
[[ $Debug ]] && echo "ImgDens1: $ImgDens"
[[ $( echo $ImgDens'>'$PaperDens | bc -l ) == 1 ]] \
&& ImgDens=$PaperDens
[[ $Debug ]] && echo "ImgDens2: $ImgDens"
ImgWdth=$( echo $PaperWdthInch \* $ImgDens | bc -l ) # pixels
ImgHght=$( echo $PaperHghtInch \* $ImgDens | bc -l ) # pixels
[[ $Debug ]] && echo "ImgWdth: $ImgWdth".
[[ $Debug ]] && echo "ImgHght: $ImgHght".
convert "${FName}" \
-resize ${ImgWdth}x${ImgHght} \
-background $IMBackground -gravity center \
-extent ${ImgWdth}x${ImgHght} \
-units PixelsPerInch -set density $ImgDens \
-repage ${ImgWdth}x${ImgHght}+0+0 \
-compress JPEG \
-quality $IMQuality \
"${FName%.$ext}.pdf"
# Merge new PDF page with prior pages
[[ -f z_merged.pdf ]] && \
{ pdftk z_merged.pdf "${FName%.$ext}.pdf" cat output z_temp.pdf
mv z_temp.pdf z_merged.pdf
} || \
cp "${FName%.$ext}.pdf" z_merged.pdf
[[ $Debug ]] || rm -rf "${FName%.$ext}.pdf"
done
[[ -f z_merged.pdf ]] && mv z_merged.pdf "$OutName"
echo "Done."
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