Useful PDF editing scripts.

graypdf

#!/bin/bash

# Convert PDF to grayscale: http://superuser.com/q/104656/149756

if [ $# -ne 2 ]; then
    echo $0: usage: pdf2gray input output
    exit 1
fi

input=$1
output=$2

gs \
    -sOutputFile=$output \
    -sDEVICE=pdfwrite \
    -sColorConversionStrategy=Gray \
    -dProcessColorModel=/DeviceGray \
    -dCompatibilityLevel=1.4 \
    -dNOPAUSE \
    -dBATCH \
    $input

mergepdf

#!/bin/bash

hash gs 2>/dev/null || {
    echo >&2 "I require gs but it's not installed."
    return
}

if [ $# -lt 3 ]; then
    echo >&2 "Require at least two inputs and one output file."
    return
fi

src=${@:1:$(($#-1))}
des=${@:$#}

gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite \
   -sOutputFile=$des $src

PDFEditingScript.md

This repo collects convenient scripts.

1. graypdf. Convert PDF to grayscale.
2. mergepdf. Merge a sequence of PDF files.