#!/bin/bash

if [ -z "${1}" ]; then
  echo 'No input PDF path given.'
  exit 1
fi

if [ -z "${2}" ]; then
  echo 'No output PNG path given.'
  exit 1
fi

TMP=$(mktemp -d)
PDF="${1}"
PNG="${2}"

pdftoppm -r 150 -png "${PDF}" ${TMP}/file
convert +append ${TMP}/* "${PNG}"

rm -rf "${TMP}"