Convert image files to PDF

images_to_pdf

#!/bin/bash

# Some of the `getopts` code has been taken from:
# http://mywiki.wooledge.org/BashFAQ/035#getopts

# Felix E. Klee <felix.klee@inka.de>

W=210
H=297
D=300

# Usage info
show_help() {
cat << EOF
Usage: ${0##*/} [-hWHD] [IMAGE FILE]...
Convert image files to: out.pdf

    -h          display this help and exit
    -W WIDTH    width in mm, default $W
    -H HEIGHT   height in mm, default $H
    -D DPI      resolution, default $D
EOF
}

# Initialize our own variables:
output_file=""

OPTIND=1
# Resetting OPTIND is necessary if getopts was used previously in the script.
# It is a good idea to make OPTIND local if you process options in a function.

while getopts hW:H:D: opt; do
    case $opt in
        h)
            show_help
            exit 0
            ;;
        W)  W=$OPTARG
            ;;
        H)  H=$OPTARG
            ;;
        D)  D=$OPTARG
            ;;
        *)
            show_help >&2
            exit 1
            ;;
    esac
done
shift "$((OPTIND-1))"   # Discard the options and sentinel --

if [ "$#" -eq 0 ]; then
    show_help >&2
    exit 1
fi

magick "$@" -density $D -page %[fx:$W/25.4*$D]x%[fx:$H/25.4*$D] -resize %[fx:page.width]x%[fx:page.height]! out.pdf