pdfScale.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+# pdfScale.sh
+#
+# Scale PDF to specified percentage of original size.
+# Ref: http://ma.juii.net/blog/scale-page-content-of-pdf-files.
+
+SCALE=0.95 # scaling factor (0.95 = 95%, e.g.)
+
+# Validate args.
+[ $# -eq 1 ] || { echo "***ERROR: Usage pdfScale.sh <inFile>.pdf"; exit 99; }
+INFILEPDF="$1"
+[[ "$INFILEPDF" =~ ^..*\.pdf$ ]] || { echo "***ERROR: Usage pdfScale.sh <inFile>.pdf"; exit 99; }
+OUTFILEPDF=$(echo "$INFILEPDF" | sed -e s/\.pdf$// -).SCALED.pdf
+
+# Dependencies
+command -v identify >/dev/null 2>&1 || { echo >&2 "Please install 'imagemagick' (sudo apt-get install imagemagick).  Aborting."; exit 1; }
+command -v gs >/dev/null 2>&1 || { echo >&2 "Please install 'ghostscript' (sudo apt-get install ghostscript ?).  Aborting."; exit 1; }
+command -v bc >/dev/null 2>&1 || { echo >&2 "Please install 'bc' arbitrary precision calculator language.  Aborting."; exit 1; }
+
+# Get width/height in postscript points (1/72-inch), via ImageMagick identify command.
+# (Alternatively, could use Poppler pdfinfo command; or grep/sed the PDF by hand.)
+IDENTIFY=($(identify $INFILEPDF 2>/dev/null)) # bash array
+[ $? -ne 0 ] &GEOMETRY=($(echo ${IDENTIFY[2]} | tr "x" " ")) # bash array — $IDENTIFY[2] is of the form PGWIDTHxPGHEIGHT
+PGWIDTH=${GEOMETRY[0]}; PGHEIGHT=${GEOMETRY[1]}
+
+# Compute translation factors (to center page.
+XTRANS=$(echo "scale=6; 0.5*(1.0-$SCALE)/$SCALE*$PGWIDTH" | bc)
+YTRANS=$(echo "scale=6; 0.5*(1.0-$SCALE)/$SCALE*$PGHEIGHT" | bc)
+
+echo $PGWIDTH , $PGHEIGHT , $OUTFILEPDF , $SCALE , $XTRANS , $YTRANS , $INFILEPDF , $OUTFILEPDF
+
+# Do it.
+gs \
+-q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dSAFER \
+-dCompatibilityLevel="1.5" -dPDFSETTINGS="/printer" \
+-dColorConversionStrategy=/LeaveColorUnchanged \
+-dSubsetFonts=true -dEmbedAllFonts=true \
+-dDEVICEWIDTH=$PGWIDTH -dDEVICEHEIGHT=$PGHEIGHT \
+-sOutputFile="$OUTFILEPDF" \
+-c "<</BeginPage{$SCALE $SCALE scale $XTRANS $YTRANS translate}>> setpagedevice" \
+-f "$INFILEPDF"