ref: f2a1c2c13ea8f9e0ece5500dd7783754362c3099
dir: /utils/sceshb/
#!/bin/rc -e
if(! ~ $#* 4){
echo usage: $0 fi fo Δx Δy
exit usage
}
tmp=/tmp/sceshb.$pid
fi=$1
fo=$2
Δx=$3
Δy=$4
cat <<EOF | pico
!r $fi f
r = z == 3 ? f[x,y,0] == 0 && f[x,y,1] == Z && f[x,y,2] == Z ? 0 : Z/2+1 : 0
!w r $tmp
EOF
iconv -c a8r8g8b8 $tmp |\
crop -t $Δx $Δy >$fo
rm $tmp