#! /bin/bash -e
# Last edited on 2025-10-21 06:48:59 by stolfi

page="$1"; shift
tag1="$1"; shift
tag2="$1"; shift
masks=( "$@" )

tdir="/tmp/$$"
mkdir -p ${tdir}

ofiles=()
for mask in ${masks[@]}; do 
  ofile="${tdir}/${mask}.png"
  convert \
    out/${page}/${tag1}/${mask}.png \
    out/${page}/${tag2}/${mask}.png \
    +append \
    ${ofile}
  ofiles+=( ${ofile} )
done
display -title '%f' ${ofiles[@]}
rm -r ${tdir}