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Type the following command ()$ gs -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=setting -sOutputFile=output.pdf input.pdf
Set the input file name properly as well as the output file name if wanted.
in -dPDFSETTINGS use:
/screen for lowest quality
/ebook for medium quality
/printer and /prepress for high quality
command $ convert input.pdf output.pdf
Options:
density image resolution
rotate rotation angle degrees
attenuate noise addition
noise noise peak reduction
flatten no virtual offline across layers
sharpen Gaussin operator to sharpen the image
Example (): $ convert -density 150 input.pdf -rotate "$([ $((RANDOM % 2)) -eq 1 ] && echo -)0.$(($RANDOM % 3))" -attenuate 0.15 +noise Multiplicative -flatten -attenuate 0.02 +noise Multiplicative -sharpen 0x1.0 output.pdf
command pdfinfo: $ pdfinfo file.pdf