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#!/bin/bash
# Optimizes and compresses the specified PDF using Ghostscript (gs).
#
# [NOTE]
# You need at least Ghostscript 9.10 in order for page labels defined in the
# PDF to be preserved (e.g., front matter pages numbered using roman numerals).
if [ -z $1 ]; then
echo "Please supply a PDF file to optimize"
exit 1
fi
if [ -z $GS ]; then
GS=gs
fi
FILE=$1
FILE_BASENAME=${FILE%.pdf}
FILE_OPTIMIZED=$FILE_BASENAME-optimized.pdf
FILE_PDFMARKS=
if [ -f "$FILE_BASENAME.pdfmarks" ]; then
FILE_PDFMARKS="$FILE_BASENAME.pdfmarks"
fi
DOWNSAMPLE_IMAGES=true
if [ -z $IMAGE_DPI ]; then
#IMAGE_DPI=150
IMAGE_DPI=300
fi
# /prepress defaults (see http://ghostscript.com/doc/current/Ps2pdf.htm)
# -d{Color,Gray,Mono}ImageDownsampleType=/Bicubic
# -dAutoFilter{Color,Gray}Images=true
# -dOptimize=true
# -dEmbedAllFonts=true
# -dSubsetFonts=true
# -dColorConversionStrategy=/LeaveColorUnchanged
# -dUCRandBGInfo=/Preserve
# -dCompressPages=true
#
# other unused settings
# -r72
#
# for info about pdfmarks, see http://milan.kupcevic.net/ghostscript-ps-pdf
#
# to convert to grayscale, add the following (though doesn't always work)
#
# -dProcessColorModel=/DeviceGray \
# -dColorConversionStrategy=/Gray \
"$GS" -q -dNOPAUSE -dBATCH -dSAFER -dNOOUTERSAVE \
-sDEVICE=pdfwrite \
-dPDFSETTINGS=/prepress \
-dCannotEmbedFontPolicy=/Warning \
-dDownsampleColorImages=$DOWNSAMPLE_IMAGES \
-dColorImageResolution=$IMAGE_DPI \
-dDownsampleGrayImages=$DOWNSAMPLE_IMAGES \
-dGrayImageResolution=$IMAGE_DPI \
-dDownsampleMonoImages=$DOWNSAMPLE_IMAGES \
-dMonoImageResolution=$IMAGE_DPI \
-sOutputFile="$FILE_OPTIMIZED" \
"$FILE" $FILE_PDFMARKS
exit 0
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