PDF

convert -density 150 input.pdf -colorspace gray -linear-stretch 3.5%x10% -blur 0x0.5 \
    -attenuate 0.25 +noise Gaussian -rotate 0.5 temp.pdf gs -dSAFER -dBATCH -dNOPAUSE \
    -dNOCACHE -sDEVICE=pdfwrite -sColorConversionStrategy=LeaveColorUnchanged \
    dAutoFilterColorImages=true -dAutoFilterGrayImages=true -dDownsampleMonoImages=true \
    -dDownsampleGrayImages=true -dDownsampleColorImages=true -sOutputFile=output.pdf temp.pdf