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Compressing a PDF using Ghostscript on command line
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| ```bash | |
| # compress PDF using ghostscript | |
| # | |
| # https://ghostscript.readthedocs.io/en/latest/VectorDevices.html#controls-and-features-specific-to-postscript-and-pdf-input | |
| # | |
| # -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 | |
| # | |
| # Usage: pdf-compress sm|md|lg /path/to/input.pdf /path/to/output.pdf | |
| # | |
| function pdf-compress { | |
| if [ $# -lt 3 ]; then | |
| echo "Usage: compress-pdf sm|md|lg input.pdf output.pdf" | |
| else | |
| # default = medium size compress | |
| size="ebook" | |
| # check which size we need | |
| case "$1" in | |
| "sm") size="screen" ;; | |
| "md") size="ebook" ;; | |
| "lg") size="prepress" ;; | |
| esac | |
| # execute only if gs command exists in shell | |
| if which gs &>/dev/null; then | |
| $(which gs) -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/"$size" \ | |
| -dNOPAUSE -dQUIET -dBATCH -sOutputFile="$3" "$2" | |
| # open the folder | |
| open -R "$3" | |
| else | |
| echo "Note: Please install Ghostscript -- brew install ghostscript" | |
| fi | |
| fi | |
| } | |
| ``` |
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