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#!/bin/sh
# https://askubuntu.com/questions/113544/how-can-i-reduce-the-file-size-of-a-scanned-pdf-file
#-dPDFSETTINGS=/screen lower quality, smaller size. (72 dpi)
#-dPDFSETTINGS=/ebook for better quality, but slightly larger pdfs. (150 dpi)
#-dPDFSETTINGS=/prepress output similar to Acrobat Distiller "Prepress Optimized" setting (300 dpi)
#-dPDFSETTINGS=/printer selects output similar to the Acrobat Distiller "Print Optimized" setting (300 dpi)
#-dPDFSETTINGS=/default selects output intended to be useful across a wide variety of uses, possibly at the expense of a larger output file
PDFSETTINGS="/printer"
image_resolution="300"
basename="$(echo "$1" | cut -f 1 -d '.')"
# full list of parameters
# https://ghostscript.com/docs/9.54.0/VectorDevices.htm
#-dCompatibilityLevel=1.4 \
gs -q -dNOPAUSE -dBATCH -dSAFER \
-sDEVICE=pdfwrite \
-dPDFSETTINGS="$PDFSETTINGS" \
-dEmbedAllFonts=true \
-dSubsetFonts=true \
-dColorImageDownsampleType=/Bicubic \
-dColorImageResolution="$image_resolution" \
-dGrayImageDownsampleType=/Bicubic \
-dGrayImageResolution="$image_resolution" \
-dMonoImageDownsampleType=/Bicubic \
-dMonoImageResolution="$image_resolution" \
-sOutputFile="$basename.compressed.pdf" \
"$1"
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